Добавили счётчик подписчиков в каналах и подписки пользователя

Репликация личных сообщений между серверами теперь работает корректно.

SHiNE-server/shine-server-blockchain/src/main/java/blockchain/MsgSubType.java

@@ -98,14 +98,9 @@ public final class MsgSubType {
     /* ===================== CONNECTION (msg_type=3) ===================== */
 
     /** Добавить в близкие друзья (close friend). */
-    public static final short CONNECTION_FRIEND = 10;
+    public static final short CONNECTION_CLOSE_FRIEND = 10;
     /** Удалить из близких друзей (close friend). */
-    public static final short CONNECTION_UNFRIEND = 11;
-
-    /** Alias: добавить в close friend (то же значение, что CONNECTION_FRIEND). */
-    public static final short CONNECTION_CLOSE_FRIEND = CONNECTION_FRIEND;
-    /** Alias: удалить из close friend (то же значение, что CONNECTION_UNFRIEND). */
-    public static final short CONNECTION_UNCLOSE_FRIEND = CONNECTION_UNFRIEND;
+    public static final short CONNECTION_UNCLOSE_FRIEND = 11;
 
     /** Добавить в контакты. */
     public static final short CONNECTION_CONTACT = 20;

SHiNE-server/shine-server-blockchain/src/main/java/blockchain/body/ConnectionBody.java

@@ -66,7 +66,7 @@ import java.util.Objects;
  *                     toBlockHash32=hash32(CREATE_CHANNEL)
  *
  *  3) ЗАПРЕТЫ ВАЛИДАЦИИ (желательно на сервере/в БД):
- *     - CONNECTION_FRIEND/CONTACT не могут ссылаться на не-HEADER (toBlockNumber != 0 запрещено).
+ *     - CONNECTION_CLOSE_FRIEND/CONTACT не могут ссылаться на не-HEADER (toBlockNumber != 0 запрещено).
  *     - FOLLOW на канал "X" не может ссылаться на произвольный пост внутри канала:
  *       разрешено ТОЛЬКО на ROOT (HEADER или CREATE_CHANNEL).
  *
@@ -183,8 +183,8 @@ public final class ConnectionBody implements BodyRecord, BodyHasTarget, BodyHasL
 
     private static boolean isValidSubType(short st) {
         int v = st & 0xFFFF;
-        return v == (MsgSubType.CONNECTION_FRIEND & 0xFFFF)
-                || v == (MsgSubType.CONNECTION_UNFRIEND & 0xFFFF)
+        return v == (MsgSubType.CONNECTION_CLOSE_FRIEND & 0xFFFF)
+                || v == (MsgSubType.CONNECTION_UNCLOSE_FRIEND & 0xFFFF)
                 || v == (MsgSubType.CONNECTION_CONTACT & 0xFFFF)
                 || v == (MsgSubType.CONNECTION_UNCONTACT & 0xFFFF)
                 || v == (MsgSubType.CONNECTION_FOLLOW & 0xFFFF)

SHiNE-server/shine-server-db/src/main/java/shine/db/DatabaseInitializer.java

@@ -26,6 +26,12 @@ public final class DatabaseInitializer {
     public static final int SCHEMA_VERSION_7 = 7;
     public static final int SCHEMA_VERSION_8 = 8;
     public static final int SCHEMA_VERSION_9 = 9;
+    public static final int SCHEMA_VERSION_10 = 10;
+    public static final int SCHEMA_VERSION_11 = 11;
+    public static final int SCHEMA_VERSION_12 = 12;
+    public static final int SCHEMA_VERSION_13 = 13;
+    public static final int SCHEMA_VERSION_14 = 14;
+    public static final int SCHEMA_VERSION_15 = 15;
     public static final String POSTGRES_SCHEMA_RESOURCE = "postgres/schema_v1.sql";
     public static final String POSTGRES_MIGRATION_V2_RESOURCE = "postgres/migration_v2.sql";
     public static final String POSTGRES_MIGRATION_V3_RESOURCE = "postgres/migration_v3.sql";
@@ -35,6 +41,12 @@ public final class DatabaseInitializer {
     public static final String POSTGRES_MIGRATION_V7_RESOURCE = "postgres/migration_v7.sql";
     public static final String POSTGRES_MIGRATION_V8_RESOURCE = "postgres/migration_v8.sql";
     public static final String POSTGRES_MIGRATION_V9_RESOURCE = "postgres/migration_v9.sql";
+    public static final String POSTGRES_MIGRATION_V10_RESOURCE = "postgres/migration_v10.sql";
+    public static final String POSTGRES_MIGRATION_V11_RESOURCE = "postgres/migration_v11.sql";
+    public static final String POSTGRES_MIGRATION_V12_RESOURCE = "postgres/migration_v12.sql";
+    public static final String POSTGRES_MIGRATION_V13_RESOURCE = "postgres/migration_v13.sql";
+    public static final String POSTGRES_MIGRATION_V14_RESOURCE = "postgres/migration_v14.sql";
+    public static final String POSTGRES_MIGRATION_V15_RESOURCE = "postgres/migration_v15.sql";
 
     private DatabaseInitializer() {}
 
@@ -53,10 +65,8 @@ public final class DatabaseInitializer {
     public static final short REACTION_LIKE = 1;
     public static final short REACTION_UNLIKE = 2;
 
-    public static final short CONNECTION_FRIEND     = 10;
-    public static final short CONNECTION_UNFRIEND   = 11;
-    public static final short CONNECTION_CLOSE_FRIEND   = CONNECTION_FRIEND;
-    public static final short CONNECTION_UNCLOSE_FRIEND = CONNECTION_UNFRIEND;
+    public static final short CONNECTION_CLOSE_FRIEND   = 10;
+    public static final short CONNECTION_UNCLOSE_FRIEND = 11;
 
     public static final short CONNECTION_CONTACT    = 20;
     public static final short CONNECTION_UNCONTACT  = 21;
@@ -130,6 +140,31 @@ public final class DatabaseInitializer {
             }
             if (currentVersion < SCHEMA_VERSION_9) {
                 runSqlScript(conn, POSTGRES_MIGRATION_V9_RESOURCE);
+                currentVersion = SCHEMA_VERSION_9;
+            }
+            if (currentVersion < SCHEMA_VERSION_10) {
+                runSqlScript(conn, POSTGRES_MIGRATION_V10_RESOURCE);
+                currentVersion = SCHEMA_VERSION_10;
+            }
+            if (currentVersion < SCHEMA_VERSION_11) {
+                runSqlScript(conn, POSTGRES_MIGRATION_V11_RESOURCE);
+                currentVersion = SCHEMA_VERSION_11;
+            }
+            if (currentVersion < SCHEMA_VERSION_12) {
+                runSqlScript(conn, POSTGRES_MIGRATION_V12_RESOURCE);
+                currentVersion = SCHEMA_VERSION_12;
+            }
+            if (currentVersion < SCHEMA_VERSION_13) {
+                runSqlScript(conn, POSTGRES_MIGRATION_V13_RESOURCE);
+                currentVersion = SCHEMA_VERSION_13;
+            }
+            if (currentVersion < SCHEMA_VERSION_14) {
+                runSqlScript(conn, POSTGRES_MIGRATION_V14_RESOURCE);
+                currentVersion = SCHEMA_VERSION_14;
+            }
+            if (currentVersion < SCHEMA_VERSION_15) {
+                runSqlScript(conn, POSTGRES_MIGRATION_V15_RESOURCE);
+                currentVersion = SCHEMA_VERSION_15;
             }
         }
     }

SHiNE-server/shine-server-db/src/main/java/shine/db/DbController.java

@@ -1,6 +1,7 @@
 package shine.db;
 
 import shine.db.connection.DbProvider;
+import shine.db.dao.DmDialogStateDAO;
 
 import java.sql.Connection;
 import java.sql.SQLException;
@@ -15,6 +16,7 @@ public final class DbController implements DbProvider {
     private static volatile DbController instance;
 
     private final PostgresDbController delegate;
+    private volatile boolean dmDialogStateBootstrapped;
 
     private DbController() {
         this.delegate = PostgresDbController.getInstance();
@@ -24,7 +26,9 @@ public final class DbController implements DbProvider {
         if (instance == null) {
             synchronized (DbController.class) {
                 if (instance == null) {
-                    instance = new DbController();
+                    DbController created = new DbController();
+                    instance = created;
+                    created.bootstrapDmDialogStateIfNeeded();
                 }
             }
         }
@@ -40,4 +44,18 @@ public final class DbController implements DbProvider {
     public void close() {
         delegate.close();
     }
+
+    private void bootstrapDmDialogStateIfNeeded() {
+        if (dmDialogStateBootstrapped) return;
+        synchronized (this) {
+            if (dmDialogStateBootstrapped) return;
+            try (Connection connection = delegate.getConnection()) {
+                DmDialogStateDAO.getInstance().bootstrapIfEmpty(connection);
+                dmDialogStateBootstrapped = true;
+            } catch (SQLException e) {
+                instance = null;
+                throw new RuntimeException("DM dialog state bootstrap failed", e);
+            }
+        }
+    }
 }

SHiNE-server/shine-server-db/src/main/java/shine/db/MsgSubType.java

@@ -58,23 +58,17 @@ public final class MsgSubType {
     /* ===================== CONNECTION (msg_type=3) ===================== */
     /**
  * Совпадает с ConnectionBody:
- * SET:   CLOSE_FRIEND(=FRIEND)=10, CONTACT=20, FOLLOW=30, SPOUSE=40, PARENT=50, CHILD=52, SIBLING=54,
+ * SET:   CLOSE_FRIEND=10, CONTACT=20, FOLLOW=30, SPOUSE=40, PARENT=50, CHILD=52, SIBLING=54,
  *        KNOWN_PERSON=60, SHINE_CONFIRMED=70, SHINE_SEEN=74
- * UNSET: UNCLOSE_FRIEND(=UNFRIEND)=11, UNCONTACT=21, UNFOLLOW=31, UNSPOUSE=41, UNPARENT=51, UNCHILD=53, UNSIBLING=55,
+ * UNSET: UNCLOSE_FRIEND=11, UNCONTACT=21, UNFOLLOW=31, UNSPOUSE=41, UNPARENT=51, UNCHILD=53, UNSIBLING=55,
  *        UNKNOWN_PERSON=61, SHINE_UNCONFIRMED=71, SHINE_UNSEEN=75
      */
 
     /** Добавить в близкие друзья (close friend). */
-    public static final short CONNECTION_FRIEND = 10;
+    public static final short CONNECTION_CLOSE_FRIEND = 10;
 
     /** Удалить из близких друзей (close friend). */
-    public static final short CONNECTION_UNFRIEND = 11;
-
-    /** Alias: добавить в close friend (то же значение, что CONNECTION_FRIEND). */
-    public static final short CONNECTION_CLOSE_FRIEND = CONNECTION_FRIEND;
-
-    /** Alias: удалить из close friend (то же значение, что CONNECTION_UNFRIEND). */
-    public static final short CONNECTION_UNCLOSE_FRIEND = CONNECTION_UNFRIEND;
+    public static final short CONNECTION_UNCLOSE_FRIEND = 11;
 
     /** Добавить в контакты. */
     public static final short CONNECTION_CONTACT = 20;

SHiNE-server/shine-server-db/src/main/java/shine/db/dao/BlockchainResyncCleanupDAO.java

@@ -99,6 +99,8 @@ public final class BlockchainResyncCleanupDAO {
                 int deletedBlocks = deleteBlocksForChain(c, blockchainName);
                 int deletedBlockchainState = deleteBlockchainStateForChain(c, blockchainName);
 
+                rebuildStatsState(c);
+
                 c.commit();
 
                 return new CleanupResult(
@@ -185,10 +187,10 @@ public final class BlockchainResyncCleanupDAO {
     private int decreaseForeignLikesCount(Connection c, String blockchainName) throws SQLException {
         String sql = """
             UPDATE message_stats
-            SET likes_count = MAX(
+            SET likes_count = GREATEST(
                 0,
-                likes_count - (
-                    SELECT COUNT(*)
+                likes_count - COALESCE((
+                    SELECT COUNT(*)::int
                     FROM reactions_state rs
                     WHERE rs.from_bch_name = ?
                       AND rs.reaction_type = ?
@@ -198,7 +200,7 @@ public final class BlockchainResyncCleanupDAO {
                       AND rs.to_block_number = message_stats.to_block_number
                       AND rs.to_block_hash = message_stats.to_block_hash
                       AND rs.to_bch_name <> ?
-                )
+                ), 0)
             )
             WHERE EXISTS (
                 SELECT 1
@@ -237,10 +239,10 @@ public final class BlockchainResyncCleanupDAO {
     private int decreaseForeignRepliesCount(Connection c, String blockchainName) throws SQLException {
         String sql = """
             UPDATE message_stats
-            SET replies_count = MAX(
+            SET replies_count = GREATEST(
                 0,
                 replies_count - COALESCE((
-                    SELECT COUNT(*)
+                    SELECT COUNT(*)::int
                     FROM blocks b
                     WHERE b.bch_name = ?
                       AND b.msg_type = 1
@@ -366,6 +368,100 @@ public final class BlockchainResyncCleanupDAO {
             """, blockchainName);
     }
 
+    private void rebuildStatsState(Connection c) throws SQLException {
+        try (PreparedStatement truncate = c.prepareStatement("""
+            TRUNCATE TABLE user_stats_state, channel_stats_state
+            """)) {
+            truncate.executeUpdate();
+        }
+
+        try (PreparedStatement ps = c.prepareStatement("""
+            INSERT INTO user_stats_state (
+                login,
+                owned_public_channels_count,
+                following_users_count,
+                following_channels_count,
+                close_friends_count,
+                updated_at_ms
+            )
+            SELECT
+                u.login,
+                COALESCE(own.owned_public_channels_count, 0),
+                COALESCE(fu.following_users_count, 0),
+                COALESCE(fc.following_channels_count, 0),
+                COALESCE(cf.close_friends_count, 0),
+                CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+            FROM solana_user_pda_current u
+            LEFT JOIN (
+                SELECT owner_login, COUNT(*)::INTEGER AS owned_public_channels_count
+                FROM channel_names_state
+                WHERE channel_type_code = 1
+                GROUP BY owner_login
+            ) own ON LOWER(own.owner_login) = LOWER(u.login)
+            LEFT JOIN (
+                SELECT login, COUNT(*)::INTEGER AS following_users_count
+                FROM connections_state
+                WHERE rel_type = 30
+                  AND to_block_number = 0
+                GROUP BY login
+            ) fu ON LOWER(fu.login) = LOWER(u.login)
+            LEFT JOIN (
+                SELECT cs.login, COUNT(*)::INTEGER AS following_channels_count
+                FROM connections_state cs
+                JOIN channel_names_state cn
+                  ON cn.owner_bch_name = cs.to_bch_name
+                 AND cn.channel_root_block_number = cs.to_block_number
+                 AND cn.channel_root_block_hash = cs.to_block_hash
+                WHERE cs.rel_type = 30
+                  AND cn.channel_type_code = 1
+                GROUP BY cs.login
+            ) fc ON LOWER(fc.login) = LOWER(u.login)
+            LEFT JOIN (
+                SELECT login, COUNT(*)::INTEGER AS close_friends_count
+                FROM connections_state
+                WHERE rel_type = 10
+                GROUP BY login
+            ) cf ON LOWER(cf.login) = LOWER(u.login)
+            """)) {
+            ps.executeUpdate();
+        }
+
+        try (PreparedStatement ps = c.prepareStatement("""
+            INSERT INTO channel_stats_state (
+                owner_bch_name,
+                channel_root_block_number,
+                channel_root_block_hash,
+                owner_login,
+                channel_type_code,
+                subscribers_count,
+                updated_at_ms
+            )
+            SELECT
+                cn.owner_bch_name,
+                cn.channel_root_block_number,
+                cn.channel_root_block_hash,
+                cn.owner_login,
+                cn.channel_type_code,
+                COUNT(DISTINCT cs.login)::INTEGER AS subscribers_count,
+                CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+            FROM channel_names_state cn
+            LEFT JOIN connections_state cs
+              ON cs.rel_type = 30
+             AND cs.to_bch_name = cn.owner_bch_name
+             AND cs.to_block_number = cn.channel_root_block_number
+             AND cs.to_block_hash = cn.channel_root_block_hash
+            WHERE cn.channel_type_code = 1
+            GROUP BY
+                cn.owner_bch_name,
+                cn.channel_root_block_number,
+                cn.channel_root_block_hash,
+                cn.owner_login,
+                cn.channel_type_code
+            """)) {
+            ps.executeUpdate();
+        }
+    }
+
     private int executeDelete(Connection c, String sql, String value) throws SQLException {
         try (PreparedStatement ps = c.prepareStatement(sql)) {
             ps.setString(1, value);

SHiNE-server/shine-server-db/src/main/java/shine/db/dao/ConnectionsStateDAO.java

@@ -67,6 +67,36 @@ public final class ConnectionsStateDAO {
         return out;
     }
 
+    public boolean hasOutgoingByRelTypeCanonical(Connection c, String loginAnyCase, String peerLoginAnyCase, int relType) throws SQLException {
+        String sql = """
+            SELECT 1
+            FROM connections_state cs
+            LEFT JOIN %s
+              ON LOWER(u_login.login) = LOWER(cs.to_login)
+            LEFT JOIN %s
+              ON LOWER(u_bch.blockchain_name) = LOWER(cs.to_bch_name)
+            WHERE LOWER(cs.login) = LOWER(?)
+              AND cs.rel_type = ?
+              AND (
+                    LOWER(cs.to_login) = LOWER(?)
+                 OR LOWER(COALESCE(u_login.login, u_bch.login, cs.to_login)) = LOWER(?)
+              )
+            LIMIT 1
+            """.formatted(
+                CurrentUsersSql.usersSubquery("u_login"),
+                CurrentUsersSql.usersSubquery("u_bch")
+            );
+        try (PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setString(1, loginAnyCase);
+            ps.setInt(2, relType);
+            ps.setString(3, peerLoginAnyCase);
+            ps.setString(4, peerLoginAnyCase);
+            try (ResultSet rs = ps.executeQuery()) {
+                return rs.next();
+            }
+        }
+    }
+
     /**
      * Incoming: список логинов (канонических), кто поставил relType пользователю login.
      */

SHiNE-server/shine-server-db/src/main/java/shine/db/dao/DmDeliveryStateDAO.java

@@ -0,0 +1,518 @@
+package shine.db.dao;
+
+import shine.db.DbController;
+import shine.db.entities.DmDeliveryStateEntry;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Types;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/** Хранилище изменяемого состояния межсерверной доставки DM-пары. */
+public final class DmDeliveryStateDAO {
+    private static volatile DmDeliveryStateDAO instance;
+    private final DbController db = DbController.getInstance();
+
+    private DmDeliveryStateDAO() {}
+
+    public static DmDeliveryStateDAO getInstance() {
+        if (instance == null) {
+            synchronized (DmDeliveryStateDAO.class) {
+                if (instance == null) instance = new DmDeliveryStateDAO();
+            }
+        }
+        return instance;
+    }
+
+    public DmDeliveryStateEntry upsertPair(
+            String outgoingMessageKey,
+            String eventId,
+            String baseKey,
+            String fromLogin,
+            String toLogin,
+            String incomingMessageKey,
+            long createdAtMs,
+            long expiresAtMs,
+            int initialState,
+            String deliveredServerLogin,
+            String routesHash,
+            boolean assistImmediately
+    ) throws SQLException {
+        long now = System.currentTimeMillis();
+        int safeState = normalizeState(initialState, deliveredServerLogin);
+        if (expiresAtMs <= now && safeState == DmDeliveryStateEntry.PENDING_NONE) {
+            safeState = DmDeliveryStateEntry.FAILED_FINAL;
+        }
+        Long nextAttemptAt = safeState == DmDeliveryStateEntry.ACCEPTED
+                ? now
+                : null;
+        String safeDeliveredLogin = safeState == DmDeliveryStateEntry.DELIVERED_ONE
+                ? normalize(deliveredServerLogin)
+                : null;
+
+        try (Connection c = db.getConnection()) {
+            String sql = """
+                INSERT INTO dm_delivery_state (
+                    outgoing_message_key, event_id, base_key, from_login, to_login,
+                    incoming_message_key, created_at_ms, delivery_expires_at_ms,
+                    delivery_state, delivered_server_login, recipient_routes_hash,
+                    attempt_index, next_attempt_at_ms, last_attempt_at_ms, last_error, updated_at_ms
+                ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 0, ?, NULL, NULL, ?)
+                ON CONFLICT (outgoing_message_key) DO UPDATE SET
+                    event_id = EXCLUDED.event_id,
+                    base_key = EXCLUDED.base_key,
+                    from_login = EXCLUDED.from_login,
+                    to_login = EXCLUDED.to_login,
+                    incoming_message_key = EXCLUDED.incoming_message_key,
+                    created_at_ms = CASE
+                        WHEN dm_delivery_state.event_id = EXCLUDED.event_id THEN dm_delivery_state.created_at_ms
+                        ELSE EXCLUDED.created_at_ms
+                    END,
+                    delivery_expires_at_ms = CASE
+                        WHEN dm_delivery_state.event_id = EXCLUDED.event_id THEN dm_delivery_state.delivery_expires_at_ms
+                        ELSE EXCLUDED.delivery_expires_at_ms
+                    END,
+                    delivery_state = CASE
+                        WHEN dm_delivery_state.event_id = EXCLUDED.event_id THEN dm_delivery_state.delivery_state
+                        ELSE EXCLUDED.delivery_state
+                    END,
+                    delivered_server_login = CASE
+                        WHEN dm_delivery_state.event_id = EXCLUDED.event_id THEN dm_delivery_state.delivered_server_login
+                        ELSE EXCLUDED.delivered_server_login
+                    END,
+                    recipient_routes_hash = CASE
+                        WHEN dm_delivery_state.event_id = EXCLUDED.event_id THEN COALESCE(dm_delivery_state.recipient_routes_hash, EXCLUDED.recipient_routes_hash)
+                        ELSE EXCLUDED.recipient_routes_hash
+                    END,
+                    attempt_index = CASE
+                        WHEN dm_delivery_state.event_id = EXCLUDED.event_id THEN dm_delivery_state.attempt_index
+                        ELSE 0
+                    END,
+                    next_attempt_at_ms = CASE
+                        WHEN dm_delivery_state.event_id = EXCLUDED.event_id THEN dm_delivery_state.next_attempt_at_ms
+                        ELSE EXCLUDED.next_attempt_at_ms
+                    END,
+                    last_attempt_at_ms = CASE
+                        WHEN dm_delivery_state.event_id = EXCLUDED.event_id THEN dm_delivery_state.last_attempt_at_ms
+                        ELSE NULL
+                    END,
+                    last_error = CASE
+                        WHEN dm_delivery_state.event_id = EXCLUDED.event_id THEN dm_delivery_state.last_error
+                        ELSE NULL
+                    END,
+                    updated_at_ms = EXCLUDED.updated_at_ms
+                """;
+            try (PreparedStatement ps = c.prepareStatement(sql)) {
+                ps.setString(1, outgoingMessageKey);
+                ps.setString(2, eventId);
+                ps.setString(3, baseKey);
+                ps.setString(4, normalize(fromLogin));
+                ps.setString(5, normalize(toLogin));
+                ps.setString(6, incomingMessageKey);
+                ps.setLong(7, createdAtMs);
+                ps.setLong(8, expiresAtMs);
+                ps.setInt(9, safeState);
+                setNullableString(ps, 10, safeDeliveredLogin);
+                setNullableString(ps, 11, normalizeBlank(routesHash));
+                setNullableLong(ps, 12, nextAttemptAt);
+                ps.setLong(13, now);
+                ps.executeUpdate();
+            }
+        }
+        DmDeliveryStateEntry result;
+        if (initialState != DmDeliveryStateEntry.PENDING_NONE || !isBlank(deliveredServerLogin)) {
+            result = mergeRemote(eventId, initialState, deliveredServerLogin, routesHash, now);
+        } else {
+            result = getByEventId(eventId);
+        }
+        if (result != null && result.getDeliveryExpiresAtMs() <= now
+                && result.getDeliveryState() == DmDeliveryStateEntry.PENDING_NONE) {
+            return finishAtExpiry(eventId, now);
+        }
+        return result;
+    }
+
+    public DmDeliveryStateEntry getByEventId(String eventId) throws SQLException {
+        if (isBlank(eventId)) return null;
+        try (Connection c = db.getConnection();
+             PreparedStatement ps = c.prepareStatement(selectColumns() + " WHERE event_id = ?")) {
+            ps.setString(1, eventId.trim());
+            try (ResultSet rs = ps.executeQuery()) {
+                return rs.next() ? mapRow(rs) : null;
+            }
+        }
+    }
+
+    public DmDeliveryStateEntry getByOutgoingMessageKey(String outgoingMessageKey) throws SQLException {
+        if (isBlank(outgoingMessageKey)) return null;
+        try (Connection c = db.getConnection();
+             PreparedStatement ps = c.prepareStatement(selectColumns() + " WHERE outgoing_message_key = ?")) {
+            ps.setString(1, outgoingMessageKey.trim());
+            try (ResultSet rs = ps.executeQuery()) {
+                return rs.next() ? mapRow(rs) : null;
+            }
+        }
+    }
+
+    public Map<String, DmDeliveryStateEntry> listByOutgoingMessageKeys(List<String> keys) throws SQLException {
+        Map<String, DmDeliveryStateEntry> out = new HashMap<>();
+        if (keys == null || keys.isEmpty()) return out;
+        String placeholders = String.join(",", java.util.Collections.nCopies(keys.size(), "?"));
+        String sql = selectColumns() + " WHERE outgoing_message_key IN (" + placeholders + ")";
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            for (int i = 0; i < keys.size(); i++) ps.setString(i + 1, keys.get(i));
+            try (ResultSet rs = ps.executeQuery()) {
+                while (rs.next()) {
+                    DmDeliveryStateEntry row = mapRow(rs);
+                    out.put(row.getOutgoingMessageKey(), row);
+                }
+            }
+        }
+        return out;
+    }
+
+    public List<DmDeliveryStateEntry> listDue(long nowMs, int limit) throws SQLException {
+        String sql = selectColumns() + """
+             WHERE delivery_state = 0
+               AND next_attempt_at_ms IS NOT NULL
+               AND next_attempt_at_ms <= ?
+             ORDER BY next_attempt_at_ms ASC, created_at_ms ASC
+             LIMIT ?
+            """;
+        List<DmDeliveryStateEntry> out = new ArrayList<>();
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setLong(1, nowMs);
+            ps.setInt(2, Math.max(1, limit));
+            try (ResultSet rs = ps.executeQuery()) {
+                while (rs.next()) out.add(mapRow(rs));
+            }
+        }
+        return out;
+    }
+
+    public boolean claimAttempt(DmDeliveryStateEntry row, long nowMs, Long nextAttemptAtMs) throws SQLException {
+        String sql = """
+            UPDATE dm_delivery_state
+            SET attempt_index = attempt_index + 1,
+                next_attempt_at_ms = ?,
+                last_attempt_at_ms = ?,
+                last_error = NULL,
+                updated_at_ms = ?
+            WHERE outgoing_message_key = ?
+              AND event_id = ?
+              AND attempt_index = ?
+              AND delivery_state = 0
+              AND next_attempt_at_ms IS NOT NULL
+              AND next_attempt_at_ms <= ?
+            """;
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            long networkLeaseUntilMs = nowMs + 60_000L;
+            Long claimedNextAttemptAtMs = nextAttemptAtMs == null
+                    ? networkLeaseUntilMs
+                    : Math.max(nextAttemptAtMs, networkLeaseUntilMs);
+            setNullableLong(ps, 1, claimedNextAttemptAtMs);
+            ps.setLong(2, nowMs);
+            ps.setLong(3, nowMs);
+            ps.setString(4, row.getOutgoingMessageKey());
+            ps.setString(5, row.getEventId());
+            ps.setInt(6, row.getAttemptIndex());
+            ps.setLong(7, nowMs);
+            return ps.executeUpdate() == 1;
+        }
+    }
+
+    public DmDeliveryStateEntry mergeRemote(
+            String eventId,
+            int remoteState,
+            String remoteDeliveredLogin,
+            String remoteRoutesHash,
+            long nowMs
+    ) throws SQLException {
+        try (Connection c = db.getConnection()) {
+            boolean previousAutoCommit = c.getAutoCommit();
+            c.setAutoCommit(false);
+            try {
+                DmDeliveryStateEntry current = getByEventIdForUpdate(c, eventId);
+                if (current == null) {
+                    c.rollback();
+                    return null;
+                }
+                MergeResult merged = merge(
+                        current.getDeliveryState(),
+                        current.getDeliveredServerLogin(),
+                        current.getRecipientRoutesHash(),
+                        remoteState,
+                        remoteDeliveredLogin,
+                        remoteRoutesHash
+                );
+                updateMutableState(c, current, merged.state(), merged.deliveredLogin(),
+                        merged.routesHash(), current.getNextAttemptAtMs(), current.getLastError(), nowMs);
+                c.commit();
+                return getByEventId(eventId);
+            } catch (Exception e) {
+                try { c.rollback(); } catch (Exception ignored) {}
+                throw e;
+            } finally {
+                c.setAutoCommit(previousAutoCommit);
+            }
+        }
+    }
+
+    public DmDeliveryStateEntry updateAfterAttempt(
+            String eventId,
+            int attemptedState,
+            String deliveredServerLogin,
+            String routesHash,
+            Long nextAttemptAtMs,
+            String lastError,
+            long nowMs
+    ) throws SQLException {
+        try (Connection c = db.getConnection()) {
+            boolean previousAutoCommit = c.getAutoCommit();
+            c.setAutoCommit(false);
+            try {
+                DmDeliveryStateEntry current = getByEventIdForUpdate(c, eventId);
+                if (current == null) {
+                    c.rollback();
+                    return null;
+                }
+                MergeResult merged = merge(
+                        current.getDeliveryState(), current.getDeliveredServerLogin(), current.getRecipientRoutesHash(),
+                        attemptedState, deliveredServerLogin, routesHash
+                );
+                Long effectiveNext = merged.state() == DmDeliveryStateEntry.ACCEPTED
+                        ? nextAttemptAtMs
+                        : null;
+                updateMutableState(c, current, merged.state(), merged.deliveredLogin(),
+                        merged.routesHash(), effectiveNext, lastError, nowMs);
+                c.commit();
+                return getByEventId(eventId);
+            } catch (Exception e) {
+                try { c.rollback(); } catch (Exception ignored) {}
+                throw e;
+            } finally {
+                c.setAutoCommit(previousAutoCommit);
+            }
+        }
+    }
+
+    public DmDeliveryStateEntry finishAtExpiry(String eventId, long nowMs) throws SQLException {
+        try (Connection c = db.getConnection()) {
+            String sql = """
+                UPDATE dm_delivery_state
+                SET delivery_state = CASE WHEN delivery_state = 0 THEN 3 ELSE delivery_state END,
+                    delivered_server_login = CASE WHEN delivery_state = 0 THEN NULL ELSE delivered_server_login END,
+                    next_attempt_at_ms = NULL,
+                    last_error = CASE WHEN delivery_state = 0 THEN 'DELIVERY_EXPIRED' ELSE last_error END,
+                    updated_at_ms = ?
+                WHERE event_id = ? AND delivery_state = 0
+                """;
+            try (PreparedStatement ps = c.prepareStatement(sql)) {
+                ps.setLong(1, nowMs);
+                ps.setString(2, eventId);
+                ps.executeUpdate();
+            }
+        }
+        return getByEventId(eventId);
+    }
+
+    /** Read-only peer confirmed that at least one recipient server accepted the message. */
+    public DmDeliveryStateEntry markDeliveredFromPeer(String eventId, long nowMs) throws SQLException {
+        try (Connection c = db.getConnection();
+             PreparedStatement ps = c.prepareStatement("""
+                 UPDATE dm_delivery_state
+                 SET delivery_state = 1,
+                     delivered_server_login = NULL,
+                     next_attempt_at_ms = NULL,
+                     last_error = NULL,
+                     updated_at_ms = ?
+                 WHERE event_id = ? AND delivery_state = 0
+                 """)) {
+            ps.setLong(1, nowMs);
+            ps.setString(2, eventId);
+            ps.executeUpdate();
+        }
+        return getByEventId(eventId);
+    }
+
+    public int removeByBaseKey(String baseKey) throws SQLException {
+        try (Connection c = db.getConnection();
+             PreparedStatement ps = c.prepareStatement("DELETE FROM dm_delivery_state WHERE base_key = ?")) {
+            ps.setString(1, baseKey);
+            return ps.executeUpdate();
+        }
+    }
+
+    public int removeConversationBefore(String fromLogin, String toLogin, long boundaryTimeMs) throws SQLException {
+        String sql = """
+            DELETE FROM dm_delivery_state
+            WHERE created_at_ms < ?
+              AND ((LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?))
+                OR (LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?)))
+            """;
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setLong(1, boundaryTimeMs);
+            ps.setString(2, fromLogin);
+            ps.setString(3, toLogin);
+            ps.setString(4, toLogin);
+            ps.setString(5, fromLogin);
+            return ps.executeUpdate();
+        }
+    }
+
+    public int removeMissingMessages() throws SQLException {
+        String sql = """
+            DELETE FROM dm_delivery_state d
+            WHERE NOT EXISTS (
+                SELECT 1 FROM signed_messages m WHERE m.message_key = d.outgoing_message_key
+            )
+            """;
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            return ps.executeUpdate();
+        }
+    }
+
+    private DmDeliveryStateEntry getByEventIdForUpdate(Connection c, String eventId) throws SQLException {
+        try (PreparedStatement ps = c.prepareStatement(selectColumns() + " WHERE event_id = ? FOR UPDATE")) {
+            ps.setString(1, eventId);
+            try (ResultSet rs = ps.executeQuery()) {
+                return rs.next() ? mapRow(rs) : null;
+            }
+        }
+    }
+
+    private void updateMutableState(
+            Connection c,
+            DmDeliveryStateEntry current,
+            int state,
+            String deliveredLogin,
+            String routesHash,
+            Long nextAttemptAtMs,
+            String lastError,
+            long nowMs
+    ) throws SQLException {
+        String sql = """
+            UPDATE dm_delivery_state
+            SET delivery_state = ?,
+                delivered_server_login = ?,
+                recipient_routes_hash = ?,
+                next_attempt_at_ms = ?,
+                last_error = ?,
+                updated_at_ms = ?
+            WHERE outgoing_message_key = ? AND event_id = ?
+            """;
+        try (PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setInt(1, state);
+            setNullableString(ps, 2, state == DmDeliveryStateEntry.DELIVERED_ONE ? normalize(deliveredLogin) : null);
+            setNullableString(ps, 3, normalizeBlank(routesHash));
+            setNullableLong(ps, 4, nextAttemptAtMs);
+            setNullableString(ps, 5, normalizeBlank(lastError));
+            ps.setLong(6, nowMs);
+            ps.setString(7, current.getOutgoingMessageKey());
+            ps.setString(8, current.getEventId());
+            ps.executeUpdate();
+        }
+    }
+
+    private MergeResult merge(
+            int localState,
+            String localLogin,
+            String localHash,
+            int remoteStateRaw,
+            String remoteLoginRaw,
+            String remoteHashRaw
+    ) {
+        int remoteState = normalizeState(remoteStateRaw, remoteLoginRaw);
+        String remoteLogin = normalize(remoteLoginRaw);
+        String localNormalizedLogin = normalize(localLogin);
+        String localRoutesHash = normalizeBlank(localHash);
+        String remoteRoutesHash = normalizeBlank(remoteHashRaw);
+        String resultHash = remoteRoutesHash != null ? remoteRoutesHash : localRoutesHash;
+
+        if (localState == DmDeliveryStateEntry.DELIVERED_ONE || localState == DmDeliveryStateEntry.DELIVERED_ALL) {
+            return new MergeResult(DmDeliveryStateEntry.DELIVERED, localNormalizedLogin,
+                    localRoutesHash != null ? localRoutesHash : remoteRoutesHash);
+        }
+        if (remoteState == DmDeliveryStateEntry.DELIVERED_ONE || remoteState == DmDeliveryStateEntry.DELIVERED_ALL) {
+            return new MergeResult(DmDeliveryStateEntry.DELIVERED, remoteLogin, resultHash);
+        }
+        if (localState == DmDeliveryStateEntry.FAILED_FINAL || remoteState == DmDeliveryStateEntry.FAILED_FINAL) {
+            return new MergeResult(DmDeliveryStateEntry.FAILED_FINAL, null, resultHash);
+        }
+        return new MergeResult(DmDeliveryStateEntry.PENDING_NONE, null, resultHash);
+    }
+
+    private int normalizeState(int state, String deliveredLogin) {
+        if (state < DmDeliveryStateEntry.PENDING_NONE || state > DmDeliveryStateEntry.FAILED_FINAL) {
+            return DmDeliveryStateEntry.PENDING_NONE;
+        }
+        if (state == DmDeliveryStateEntry.DELIVERED_ALL) return DmDeliveryStateEntry.DELIVERED;
+        return state;
+    }
+
+    private String selectColumns() {
+        return """
+            SELECT outgoing_message_key, event_id, base_key, from_login, to_login,
+                   incoming_message_key, created_at_ms, delivery_expires_at_ms,
+                   delivery_state, delivered_server_login, recipient_routes_hash,
+                   attempt_index, next_attempt_at_ms, last_attempt_at_ms, last_error, updated_at_ms
+            FROM dm_delivery_state
+            """;
+    }
+
+    private DmDeliveryStateEntry mapRow(ResultSet rs) throws SQLException {
+        DmDeliveryStateEntry e = new DmDeliveryStateEntry();
+        e.setOutgoingMessageKey(rs.getString("outgoing_message_key"));
+        e.setEventId(rs.getString("event_id"));
+        e.setBaseKey(rs.getString("base_key"));
+        e.setFromLogin(rs.getString("from_login"));
+        e.setToLogin(rs.getString("to_login"));
+        e.setIncomingMessageKey(rs.getString("incoming_message_key"));
+        e.setCreatedAtMs(rs.getLong("created_at_ms"));
+        e.setDeliveryExpiresAtMs(rs.getLong("delivery_expires_at_ms"));
+        e.setDeliveryState(rs.getInt("delivery_state"));
+        e.setDeliveredServerLogin(rs.getString("delivered_server_login"));
+        e.setRecipientRoutesHash(rs.getString("recipient_routes_hash"));
+        e.setAttemptIndex(rs.getInt("attempt_index"));
+        long next = rs.getLong("next_attempt_at_ms");
+        e.setNextAttemptAtMs(rs.wasNull() ? null : next);
+        long last = rs.getLong("last_attempt_at_ms");
+        e.setLastAttemptAtMs(rs.wasNull() ? null : last);
+        e.setLastError(rs.getString("last_error"));
+        e.setUpdatedAtMs(rs.getLong("updated_at_ms"));
+        return e;
+    }
+
+    private static void setNullableString(PreparedStatement ps, int index, String value) throws SQLException {
+        if (isBlank(value)) ps.setNull(index, Types.VARCHAR);
+        else ps.setString(index, value.trim());
+    }
+
+    private static void setNullableLong(PreparedStatement ps, int index, Long value) throws SQLException {
+        if (value == null) ps.setNull(index, Types.BIGINT);
+        else ps.setLong(index, value);
+    }
+
+    private static String normalize(String value) {
+        if (value == null) return null;
+        String normalized = value.trim().toLowerCase();
+        return normalized.isEmpty() ? null : normalized;
+    }
+
+    private static String normalizeBlank(String value) {
+        if (value == null) return null;
+        String normalized = value.trim();
+        return normalized.isEmpty() ? null : normalized;
+    }
+
+    private static boolean isBlank(String value) {
+        return value == null || value.isBlank();
+    }
+
+    private record MergeResult(int state, String deliveredLogin, String routesHash) {}
+}

SHiNE-server/shine-server-db/src/main/java/shine/db/dao/DmDialogStateDAO.java

@@ -0,0 +1,453 @@
+package shine.db.dao;
+
+import shine.db.MsgSubType;
+import shine.db.entities.SignedMessageEntry;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.Base64;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+public final class DmDialogStateDAO {
+    private static volatile DmDialogStateDAO instance;
+
+    private DmDialogStateDAO() {}
+
+    public static DmDialogStateDAO getInstance() {
+        if (instance == null) {
+            synchronized (DmDialogStateDAO.class) {
+                if (instance == null) instance = new DmDialogStateDAO();
+            }
+        }
+        return instance;
+    }
+
+    public void bootstrapIfEmpty(Connection c) throws SQLException {
+        if (c == null) return;
+        if (hasAnyRow(c)) return;
+
+        boolean prevAutoCommit = c.getAutoCommit();
+        c.setAutoCommit(false);
+        try {
+            for (PairItem pair : listConversationPairs(c)) {
+                refreshConversationPair(c, pair.ownerLogin(), pair.peerLogin());
+            }
+            c.commit();
+        } catch (Exception e) {
+            try { c.rollback(); } catch (Exception ignored) {}
+            if (e instanceof SQLException sqlEx) throw sqlEx;
+            throw new SQLException("Failed to bootstrap dm_dialog_state", e);
+        } finally {
+            c.setAutoCommit(prevAutoCommit);
+        }
+    }
+
+    public void refreshConversationPair(Connection c, String ownerLogin, String peerLogin) throws SQLException {
+        String cleanOwner = normalize(ownerLogin);
+        String cleanPeer = normalize(peerLogin);
+        if (cleanOwner.isEmpty() || cleanPeer.isEmpty()) return;
+        if (cleanOwner.equalsIgnoreCase(cleanPeer)) return;
+        refreshConversation(c, cleanOwner, cleanPeer);
+        refreshConversation(c, cleanPeer, cleanOwner);
+    }
+
+    public List<DialogSummary> listInboxDialogs(Connection c, String ownerLogin) throws SQLException {
+        String cleanOwner = normalize(ownerLogin);
+        if (cleanOwner.isEmpty()) return List.of();
+
+        Map<String, DialogSummary> byPeer = new LinkedHashMap<>();
+        List<String> contacts = ConnectionsStateDAO.getInstance().listOutgoingByRelTypeCanonical(c, cleanOwner, MsgSubType.CONNECTION_CONTACT);
+        List<String> closeFriends = ConnectionsStateDAO.getInstance().listOutgoingByRelTypeCanonical(c, cleanOwner, MsgSubType.CONNECTION_CLOSE_FRIEND);
+
+        try (PreparedStatement ps = c.prepareStatement("""
+            SELECT owner_login, peer_login, relation_flag, last_message_blob_b64,
+                   last_message_time_ms, unread_count, last_read_receipt_time_ms,
+                   updated_at_ms
+            FROM dm_dialog_state
+            WHERE LOWER(owner_login) = LOWER(?)
+            """)) {
+            ps.setString(1, cleanOwner);
+            try (ResultSet rs = ps.executeQuery()) {
+                while (rs.next()) {
+                    DialogSummary row = new DialogSummary(
+                            rs.getString("owner_login"),
+                            rs.getString("peer_login"),
+                            normalizeRelationFlag(rs.getString("relation_flag")),
+                            rs.getString("last_message_blob_b64"),
+                            rs.getLong("last_message_time_ms"),
+                            rs.getInt("unread_count"),
+                            rs.getLong("last_read_receipt_time_ms"),
+                            rs.getLong("updated_at_ms"),
+                            true
+                    );
+                    byPeer.put(normKey(row.peerLogin()), row);
+                }
+            }
+        }
+
+        for (String peer : contacts) {
+            addOrUpdateSummary(byPeer, cleanOwner, peer, "contact", false);
+        }
+        for (String peer : closeFriends) {
+            addOrUpdateSummary(byPeer, cleanOwner, peer, "close_friend", false);
+        }
+
+        for (DialogSummary row : new ArrayList<>(byPeer.values())) {
+            String relationFlag = resolveRelationFlag(c, cleanOwner, row.peerLogin());
+            byPeer.put(normKey(row.peerLogin()), new DialogSummary(
+                    row.ownerLogin(),
+                    row.peerLogin(),
+                    relationFlag,
+                    row.lastMessageBlobB64(),
+                    row.lastMessageTimeMs(),
+                    row.unreadCount(),
+                    row.lastReadReceiptTimeMs(),
+                    row.updatedAtMs(),
+                    row.hasDialog()
+            ));
+        }
+
+        List<DialogSummary> out = new ArrayList<>(byPeer.values());
+        out.sort((a, b) -> {
+            int cmp = Long.compare(b.lastMessageTimeMs(), a.lastMessageTimeMs());
+            if (cmp != 0) return cmp;
+            return normalize(a.peerLogin()).compareToIgnoreCase(normalize(b.peerLogin()));
+        });
+        return out;
+    }
+
+    public void refreshFromEntry(Connection c, SignedMessageEntry entry) throws SQLException {
+        if (entry == null) return;
+        refreshConversationPair(c, entry.getFromLogin(), entry.getToLogin());
+    }
+
+    private void refreshConversation(Connection c, String ownerLogin, String peerLogin) throws SQLException {
+        DialogSummary summary = loadConversationSummary(c, ownerLogin, peerLogin);
+        upsert(c, summary);
+        if (summary.lastReadReceiptTimeMs() > 0) {
+            syncMessagesToWatermark(c, summary.ownerLogin(), summary.peerLogin(), summary.lastReadReceiptTimeMs());
+        }
+    }
+
+    private DialogSummary loadConversationSummary(Connection c, String ownerLogin, String peerLogin) throws SQLException {
+        String cleanOwner = normalize(ownerLogin);
+        String cleanPeer = normalize(peerLogin);
+        if (cleanOwner.isEmpty() || cleanPeer.isEmpty() || cleanOwner.equalsIgnoreCase(cleanPeer)) {
+            return new DialogSummary(cleanOwner, cleanPeer, "none", "", 0L, 0, 0L, System.currentTimeMillis(), false);
+        }
+
+        String relationFlag = resolveRelationFlag(c, cleanOwner, cleanPeer);
+        long existingWatermark = loadExistingWatermark(c, cleanOwner, cleanPeer);
+
+        String latestSql = """
+            SELECT raw_block, time_ms
+            FROM signed_messages
+            WHERE (
+                    (LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?))
+                 OR (LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?))
+                  )
+              AND message_type IN (1, 2)
+            ORDER BY time_ms DESC, revision_time_ms DESC, reencrypted_at_ms DESC, created_at_ms DESC, message_key DESC
+            LIMIT 1
+            """;
+        String unreadSql = """
+            SELECT COUNT(*)
+            FROM signed_messages
+            WHERE LOWER(from_login) = LOWER(?)
+              AND LOWER(to_login) = LOWER(?)
+              AND message_type = 1
+              AND time_ms > ?
+              AND (read_at_ms IS NULL OR read_at_ms <= 0)
+            """;
+        String contentReadSql = """
+            SELECT MAX(read_at_ms)
+            FROM signed_messages
+            WHERE (
+                    (LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?))
+                 OR (LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?))
+                  )
+              AND message_type IN (1, 2)
+              AND read_at_ms IS NOT NULL
+              AND read_at_ms > 0
+            """;
+        String receiptWatermarkSql = """
+            SELECT MAX(time_ms)
+            FROM signed_messages
+            WHERE (
+                    (LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?))
+                 OR (LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?))
+                  )
+              AND message_type IN (3, 4)
+            """;
+
+        String lastMessageBlobB64 = "";
+        long lastMessageTimeMs = 0L;
+        int unreadCount = 0;
+        long lastReadReceiptTimeMs = existingWatermark;
+
+        try (PreparedStatement ps = c.prepareStatement(latestSql)) {
+            ps.setString(1, cleanOwner);
+            ps.setString(2, cleanPeer);
+            ps.setString(3, cleanPeer);
+            ps.setString(4, cleanOwner);
+            try (ResultSet rs = ps.executeQuery()) {
+                if (rs.next()) {
+                    lastMessageTimeMs = rs.getLong("time_ms");
+                    byte[] rawBlock = rs.getBytes("raw_block");
+                    if (rawBlock != null && rawBlock.length > 0) {
+                        lastMessageBlobB64 = Base64.getEncoder().encodeToString(rawBlock);
+                    }
+                }
+            }
+        }
+
+        try (PreparedStatement ps = c.prepareStatement(contentReadSql)) {
+            ps.setString(1, cleanOwner);
+            ps.setString(2, cleanPeer);
+            ps.setString(3, cleanPeer);
+            ps.setString(4, cleanOwner);
+            try (ResultSet rs = ps.executeQuery()) {
+                if (rs.next()) {
+                    long value = rs.getLong(1);
+                    if (!rs.wasNull()) lastReadReceiptTimeMs = Math.max(lastReadReceiptTimeMs, value);
+                }
+            }
+        }
+
+        try (PreparedStatement ps = c.prepareStatement(receiptWatermarkSql)) {
+            ps.setString(1, cleanOwner);
+            ps.setString(2, cleanPeer);
+            ps.setString(3, cleanPeer);
+            ps.setString(4, cleanOwner);
+            try (ResultSet rs = ps.executeQuery()) {
+                if (rs.next()) {
+                    long value = rs.getLong(1);
+                    if (!rs.wasNull()) lastReadReceiptTimeMs = Math.max(lastReadReceiptTimeMs, value);
+                }
+            }
+        }
+
+        try (PreparedStatement ps = c.prepareStatement(unreadSql)) {
+            ps.setString(1, cleanPeer);
+            ps.setString(2, cleanOwner);
+            ps.setLong(3, lastReadReceiptTimeMs);
+            try (ResultSet rs = ps.executeQuery()) {
+                if (rs.next()) unreadCount = rs.getInt(1);
+            }
+        }
+
+        return new DialogSummary(
+                cleanOwner,
+                cleanPeer,
+                relationFlag,
+                lastMessageBlobB64,
+                lastMessageTimeMs,
+                unreadCount,
+                lastReadReceiptTimeMs,
+                System.currentTimeMillis(),
+                lastMessageTimeMs > 0 || unreadCount > 0 || lastReadReceiptTimeMs > 0
+        );
+    }
+
+    private void upsert(Connection c, DialogSummary summary) throws SQLException {
+        try (PreparedStatement ps = c.prepareStatement("""
+            INSERT INTO dm_dialog_state (
+                owner_login, peer_login, relation_flag, last_message_blob_b64,
+                last_message_time_ms, unread_count, last_read_receipt_time_ms, updated_at_ms
+            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+            ON CONFLICT (owner_login, peer_login) DO UPDATE SET
+                relation_flag = EXCLUDED.relation_flag,
+                last_message_blob_b64 = EXCLUDED.last_message_blob_b64,
+                last_message_time_ms = EXCLUDED.last_message_time_ms,
+                unread_count = EXCLUDED.unread_count,
+                last_read_receipt_time_ms = EXCLUDED.last_read_receipt_time_ms,
+                updated_at_ms = EXCLUDED.updated_at_ms
+            """)) {
+            ps.setString(1, summary.ownerLogin());
+            ps.setString(2, summary.peerLogin());
+            ps.setString(3, normalizeRelationFlag(summary.relationFlag()));
+            ps.setString(4, summary.lastMessageBlobB64());
+            ps.setLong(5, summary.lastMessageTimeMs());
+            ps.setInt(6, summary.unreadCount());
+            ps.setLong(7, summary.lastReadReceiptTimeMs());
+            ps.setLong(8, summary.updatedAtMs());
+            ps.executeUpdate();
+        }
+    }
+
+    private String resolveRelationFlag(Connection c, String ownerLogin, String peerLogin) throws SQLException {
+        if (ConnectionsStateDAO.getInstance().hasOutgoingByRelTypeCanonical(c, ownerLogin, peerLogin, MsgSubType.CONNECTION_CLOSE_FRIEND)) {
+            return "close_friend";
+        }
+        if (ConnectionsStateDAO.getInstance().hasOutgoingByRelTypeCanonical(c, ownerLogin, peerLogin, MsgSubType.CONNECTION_CONTACT)) {
+            return "contact";
+        }
+        return "none";
+    }
+
+    private boolean hasAnyRow(Connection c) throws SQLException {
+        try (Statement st = c.createStatement();
+             ResultSet rs = st.executeQuery("SELECT 1 FROM dm_dialog_state LIMIT 1")) {
+            return rs.next();
+        }
+    }
+
+    private List<PairItem> listConversationPairs(Connection c) throws SQLException {
+        String sql = """
+            SELECT DISTINCT owner_login, peer_login
+            FROM (
+                SELECT
+                    m.target_login AS owner_login,
+                    CASE
+                        WHEN LOWER(m.target_login) = LOWER(m.to_login) THEN m.from_login
+                        ELSE m.to_login
+                    END AS peer_login
+                FROM signed_messages m
+                WHERE m.message_type IN (1, 2, 3, 4, 5, 6, 7, 8)
+
+                UNION ALL
+
+                SELECT m.from_login AS owner_login, m.to_login AS peer_login
+                FROM signed_messages m
+                WHERE m.message_type IN (5, 6, 7, 8)
+
+                UNION ALL
+
+                SELECT m.to_login AS owner_login, m.from_login AS peer_login
+                FROM signed_messages m
+                WHERE m.message_type IN (5, 6, 7, 8)
+            ) pairs
+            WHERE owner_login IS NOT NULL
+              AND peer_login IS NOT NULL
+              AND BTRIM(owner_login) <> ''
+              AND BTRIM(peer_login) <> ''
+              AND LOWER(owner_login) <> LOWER(peer_login)
+            ORDER BY owner_login, peer_login
+            """;
+        List<PairItem> out = new ArrayList<>();
+        try (Statement st = c.createStatement();
+             ResultSet rs = st.executeQuery(sql)) {
+            while (rs.next()) {
+                String ownerLogin = rs.getString("owner_login");
+                String peerLogin = rs.getString("peer_login");
+                if (normalize(ownerLogin).isEmpty() || normalize(peerLogin).isEmpty()) continue;
+                out.add(new PairItem(ownerLogin, peerLogin));
+            }
+        }
+        return out;
+    }
+
+    private void addOrUpdateSummary(Map<String, DialogSummary> map, String ownerLogin, String peerLogin, String relationFlag, boolean hasDialog) {
+        String owner = normalize(ownerLogin);
+        String peer = normalize(peerLogin);
+        if (owner.isEmpty() || peer.isEmpty() || owner.equalsIgnoreCase(peer)) return;
+        String key = normKey(peer);
+        DialogSummary current = map.get(key);
+        if (current == null) {
+            map.put(key, new DialogSummary(owner, peer, relationFlag, "", 0L, 0, 0L, System.currentTimeMillis(), hasDialog));
+            return;
+        }
+        String nextRelation = current.relationFlag();
+        if ("close_friend".equalsIgnoreCase(relationFlag) || "close_friend".equalsIgnoreCase(nextRelation)) {
+            nextRelation = "close_friend";
+        } else if ("contact".equalsIgnoreCase(relationFlag) || "contact".equalsIgnoreCase(nextRelation)) {
+            nextRelation = "contact";
+        } else {
+            nextRelation = normalizeRelationFlag(nextRelation);
+        }
+        map.put(key, new DialogSummary(
+                current.ownerLogin().isEmpty() ? owner : current.ownerLogin(),
+                peer,
+                nextRelation,
+                current.lastMessageBlobB64(),
+                current.lastMessageTimeMs(),
+                current.unreadCount(),
+                current.lastReadReceiptTimeMs(),
+                current.updatedAtMs(),
+                current.hasDialog() || hasDialog
+        ));
+    }
+
+    private void syncMessagesToWatermark(Connection c, String ownerLogin, String peerLogin, long watermark) throws SQLException {
+        if (watermark <= 0) return;
+        String cleanOwner = normalize(ownerLogin);
+        String cleanPeer = normalize(peerLogin);
+        if (cleanOwner.isEmpty() || cleanPeer.isEmpty() || cleanOwner.equalsIgnoreCase(cleanPeer)) return;
+        try (PreparedStatement ps = c.prepareStatement("""
+            UPDATE signed_messages
+            SET read_at_ms = CASE
+                WHEN read_at_ms IS NULL OR read_at_ms <= 0 THEN ?
+                WHEN read_at_ms > ? THEN read_at_ms
+                ELSE read_at_ms
+            END
+            WHERE (
+                    (LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?))
+                 OR (LOWER(from_login) = LOWER(?) AND LOWER(to_login) = LOWER(?))
+                  )
+              AND message_type IN (1, 2)
+              AND time_ms <= ?
+            """)) {
+            ps.setLong(1, watermark);
+            ps.setLong(2, watermark);
+            ps.setString(3, cleanOwner);
+            ps.setString(4, cleanPeer);
+            ps.setString(5, cleanPeer);
+            ps.setString(6, cleanOwner);
+            ps.setLong(7, watermark);
+            ps.executeUpdate();
+        }
+    }
+
+    private long loadExistingWatermark(Connection c, String ownerLogin, String peerLogin) throws SQLException {
+        try (PreparedStatement ps = c.prepareStatement("""
+            SELECT last_read_receipt_time_ms
+            FROM dm_dialog_state
+            WHERE LOWER(owner_login) = LOWER(?)
+              AND LOWER(peer_login) = LOWER(?)
+            LIMIT 1
+            """)) {
+            ps.setString(1, ownerLogin);
+            ps.setString(2, peerLogin);
+            try (ResultSet rs = ps.executeQuery()) {
+                if (!rs.next()) return 0L;
+                long value = rs.getLong(1);
+                return rs.wasNull() ? 0L : value;
+            }
+        }
+    }
+
+    private String normalize(String value) {
+        return value == null ? "" : value.trim();
+    }
+
+    private String normKey(String value) {
+        return normalize(value).toLowerCase(Locale.ROOT);
+    }
+
+    private String normalizeRelationFlag(String value) {
+        String clean = normalize(value).toLowerCase(Locale.ROOT);
+        if ("close_friend".equals(clean) || "contact".equals(clean)) return clean;
+        return "none";
+    }
+
+    public record DialogSummary(
+            String ownerLogin,
+            String peerLogin,
+            String relationFlag,
+            String lastMessageBlobB64,
+            long lastMessageTimeMs,
+            int unreadCount,
+            long lastReadReceiptTimeMs,
+            long updatedAtMs,
+            boolean hasDialog
+    ) {}
+
+    private record PairItem(String ownerLogin, String peerLogin) {}
+}

SHiNE-server/shine-server-db/src/main/java/shine/db/dao/DmSyncOutboxDAO.java

@@ -0,0 +1,232 @@
+package shine.db.dao;
+
+import shine.db.DbController;
+import shine.db.entities.DmSyncOutboxEntry;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Types;
+import java.util.ArrayList;
+import java.util.List;
+
+/** Outbox событий DM для единственного второго access-сервера пользователя. */
+public final class DmSyncOutboxDAO {
+    private static volatile DmSyncOutboxDAO instance;
+    private final DbController db = DbController.getInstance();
+
+    private DmSyncOutboxDAO() {}
+
+    public static DmSyncOutboxDAO getInstance() {
+        if (instance == null) {
+            synchronized (DmSyncOutboxDAO.class) {
+                if (instance == null) instance = new DmSyncOutboxDAO();
+            }
+        }
+        return instance;
+    }
+
+    public void upsert(
+            String ownerLogin,
+            String primaryMessageKey,
+            String eventId,
+            String secondaryMessageKey,
+            boolean synced,
+            long createdAtMs
+    ) throws SQLException {
+        long now = System.currentTimeMillis();
+        String sql = """
+            INSERT INTO dm_sync_outbox (
+                owner_login, primary_message_key, event_id, secondary_message_key,
+                synced, created_at_ms, updated_at_ms
+            ) VALUES (LOWER(?), ?, ?, ?, ?, ?, ?)
+            ON CONFLICT (owner_login, primary_message_key) DO UPDATE SET
+                event_id = EXCLUDED.event_id,
+                secondary_message_key = EXCLUDED.secondary_message_key,
+                synced = CASE
+                    WHEN dm_sync_outbox.event_id = EXCLUDED.event_id
+                        THEN dm_sync_outbox.synced OR EXCLUDED.synced
+                    ELSE EXCLUDED.synced
+                END,
+                created_at_ms = CASE
+                    WHEN dm_sync_outbox.event_id = EXCLUDED.event_id
+                        THEN dm_sync_outbox.created_at_ms
+                    ELSE EXCLUDED.created_at_ms
+                END,
+                updated_at_ms = EXCLUDED.updated_at_ms
+            """;
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setString(1, ownerLogin);
+            ps.setString(2, primaryMessageKey);
+            ps.setString(3, eventId);
+            if (secondaryMessageKey == null || secondaryMessageKey.isBlank()) ps.setNull(4, Types.VARCHAR);
+            else ps.setString(4, secondaryMessageKey.trim());
+            ps.setBoolean(5, synced);
+            ps.setLong(6, createdAtMs);
+            ps.setLong(7, now);
+            ps.executeUpdate();
+        }
+    }
+
+    public List<DmSyncOutboxEntry> listUnsynced(String ownerLogin, int limit) throws SQLException {
+        return listUnsynced(ownerLogin, 0L, "", limit);
+    }
+
+    public List<DmSyncOutboxEntry> listUnsynced(
+            String ownerLogin, long afterCreatedAtMs, String afterPrimaryMessageKey, int limit
+    ) throws SQLException {
+        String sql = """
+            SELECT owner_login, primary_message_key, event_id, secondary_message_key,
+                   synced, created_at_ms, updated_at_ms
+            FROM dm_sync_outbox
+            WHERE LOWER(owner_login) = LOWER(?) AND synced = FALSE
+              AND (created_at_ms > ? OR (created_at_ms = ? AND primary_message_key > ?))
+            ORDER BY created_at_ms ASC, primary_message_key ASC
+            LIMIT ?
+            """;
+        List<DmSyncOutboxEntry> out = new ArrayList<>();
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setString(1, ownerLogin);
+            ps.setLong(2, Math.max(0L, afterCreatedAtMs));
+            ps.setLong(3, Math.max(0L, afterCreatedAtMs));
+            ps.setString(4, afterPrimaryMessageKey == null ? "" : afterPrimaryMessageKey);
+            ps.setInt(5, Math.max(1, limit));
+            try (ResultSet rs = ps.executeQuery()) {
+                while (rs.next()) out.add(mapRow(rs));
+            }
+        }
+        return out;
+    }
+
+    public boolean hasUnsyncedForServer(String serverLogin) throws SQLException {
+        String sql = """
+            SELECT 1
+            FROM dm_sync_outbox o
+            JOIN user_access_servers_current r
+              ON LOWER(r.user_login) = LOWER(o.owner_login)
+            WHERE o.synced = FALSE AND LOWER(r.server_login) = LOWER(?)
+              AND EXISTS (
+                  SELECT 1
+                  FROM user_access_servers_current peer
+                  WHERE LOWER(peer.user_login) = LOWER(o.owner_login)
+                    AND LOWER(peer.server_login) <> LOWER(?)
+              )
+            LIMIT 1
+            """;
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setString(1, serverLogin);
+            ps.setString(2, serverLogin);
+            try (ResultSet rs = ps.executeQuery()) {
+                return rs.next();
+            }
+        }
+    }
+
+    public List<String> listUnsyncedOwnersForServer(String serverLogin) throws SQLException {
+        String sql = """
+            SELECT DISTINCT o.owner_login
+            FROM dm_sync_outbox o
+            JOIN user_access_servers_current r
+              ON LOWER(r.user_login) = LOWER(o.owner_login)
+            WHERE o.synced = FALSE AND LOWER(r.server_login) = LOWER(?)
+              AND EXISTS (
+                  SELECT 1
+                  FROM user_access_servers_current peer
+                  WHERE LOWER(peer.user_login) = LOWER(o.owner_login)
+                    AND LOWER(peer.server_login) <> LOWER(?)
+              )
+            ORDER BY o.owner_login
+            """;
+        List<String> result = new ArrayList<>();
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setString(1, serverLogin);
+            ps.setString(2, serverLogin);
+            try (ResultSet rs = ps.executeQuery()) {
+                while (rs.next()) result.add(rs.getString("owner_login"));
+            }
+        }
+        return result;
+    }
+
+    public int markSynced(String ownerLogin, String eventId) throws SQLException {
+        String sql = """
+            UPDATE dm_sync_outbox
+            SET synced = TRUE, updated_at_ms = ?
+            WHERE LOWER(owner_login) = LOWER(?) AND event_id = ?
+            """;
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setLong(1, System.currentTimeMillis());
+            ps.setString(2, ownerLogin);
+            ps.setString(3, eventId);
+            return ps.executeUpdate();
+        }
+    }
+
+    public int markSynced(String ownerLogin, List<String> eventIds) throws SQLException {
+        if (eventIds == null || eventIds.isEmpty()) return 0;
+        int total = 0;
+        try (Connection c = db.getConnection();
+             PreparedStatement ps = c.prepareStatement("""
+                 UPDATE dm_sync_outbox
+                 SET synced = TRUE, updated_at_ms = ?
+                 WHERE LOWER(owner_login) = LOWER(?) AND event_id = ?
+                 """)) {
+            long now = System.currentTimeMillis();
+            for (String eventId : eventIds) {
+                if (eventId == null || eventId.isBlank()) continue;
+                ps.setLong(1, now);
+                ps.setString(2, ownerLogin);
+                ps.setString(3, eventId.trim());
+                ps.addBatch();
+            }
+            for (int changed : ps.executeBatch()) if (changed > 0) total += changed;
+        }
+        return total;
+    }
+
+    public int markAllUnsynced(String ownerLogin) throws SQLException {
+        String sql = """
+            UPDATE dm_sync_outbox
+            SET synced = FALSE, updated_at_ms = ?
+            WHERE LOWER(owner_login) = LOWER(?)
+            """;
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setLong(1, System.currentTimeMillis());
+            ps.setString(2, ownerLogin);
+            return ps.executeUpdate();
+        }
+    }
+
+    public int markAllUnsynced() throws SQLException {
+        try (Connection c = db.getConnection();
+             PreparedStatement ps = c.prepareStatement("UPDATE dm_sync_outbox SET synced = FALSE, updated_at_ms = ?")) {
+            ps.setLong(1, System.currentTimeMillis());
+            return ps.executeUpdate();
+        }
+    }
+
+    public int removeMissingMessages() throws SQLException {
+        String sql = """
+            DELETE FROM dm_sync_outbox o
+            WHERE NOT EXISTS (
+                SELECT 1 FROM signed_messages m WHERE m.message_key = o.primary_message_key
+            )
+            """;
+        try (Connection c = db.getConnection(); PreparedStatement ps = c.prepareStatement(sql)) {
+            return ps.executeUpdate();
+        }
+    }
+
+    private DmSyncOutboxEntry mapRow(ResultSet rs) throws SQLException {
+        DmSyncOutboxEntry e = new DmSyncOutboxEntry();
+        e.setOwnerLogin(rs.getString("owner_login"));
+        e.setPrimaryMessageKey(rs.getString("primary_message_key"));
+        e.setEventId(rs.getString("event_id"));
+        e.setSecondaryMessageKey(rs.getString("secondary_message_key"));
+        e.setSynced(rs.getBoolean("synced"));
+        e.setCreatedAtMs(rs.getLong("created_at_ms"));
+        e.setUpdatedAtMs(rs.getLong("updated_at_ms"));
+        return e;
+    }
+}

SHiNE-server/shine-server-db/src/main/java/shine/db/dao/SignedMessagesDAO.java

@@ -58,6 +58,7 @@ public final class SignedMessagesDAO {
                     ApplyStatus status = ps.executeUpdate() > 0 ? ApplyStatus.APPLIED : ApplyStatus.DUPLICATE_OR_OLDER;
                     if (status.applied()) {
                         markMessageReadByReceipt(c, e);
+                        DmDialogStateDAO.getInstance().refreshFromEntry(c, e);
                     }
                     return status;
                 }
@@ -76,6 +77,7 @@ public final class SignedMessagesDAO {
                     if (insertedFirst == 1 && insertedSecond == 1) {
                         markMessageReadByReceipt(c, first);
                         markMessageReadByReceipt(c, second);
+                        DmDialogStateDAO.getInstance().refreshConversationPair(c, first.getFromLogin(), first.getToLogin());
                         c.commit();
                         return true;
                     }
@@ -122,6 +124,7 @@ public final class SignedMessagesDAO {
                     markMessageReadByReceipt(c, outgoing);
                     resetDeliveryRows(c, incoming.getMessageKey());
                     resetDeliveryRows(c, outgoing.getMessageKey());
+                    DmDialogStateDAO.getInstance().refreshConversationPair(c, incoming.getFromLogin(), incoming.getToLogin());
 
                     c.commit();
                     return ApplyStatus.APPLIED;
@@ -160,6 +163,7 @@ public final class SignedMessagesDAO {
                     upsertMessage(c, incoming);
                     markMessageReadByReceipt(c, incoming);
                     resetDeliveryRows(c, incoming.getMessageKey());
+                    DmDialogStateDAO.getInstance().refreshConversationPair(c, incoming.getFromLogin(), incoming.getToLogin());
                     c.commit();
                     return ApplyStatus.APPLIED;
                 } catch (Exception ex) {
@@ -190,6 +194,7 @@ public final class SignedMessagesDAO {
                     deleteMessageContentAndReceipts(c, tombstone.getBaseKey());
                     upsertMessage(c, tombstone);
                     resetDeliveryRows(c, tombstone.getMessageKey());
+                    DmDialogStateDAO.getInstance().refreshConversationPair(c, tombstone.getFromLogin(), tombstone.getToLogin());
 
                     c.commit();
                     return ApplyStatus.APPLIED;
@@ -218,6 +223,7 @@ public final class SignedMessagesDAO {
                     deleteConversationHistoryBefore(c, tombstone.getFromLogin(), tombstone.getToLogin(), tombstone.getTimeMs());
                     upsertMessage(c, tombstone);
                     resetDeliveryRows(c, tombstone.getMessageKey());
+                    DmDialogStateDAO.getInstance().refreshConversationPair(c, tombstone.getFromLogin(), tombstone.getToLogin());
 
                     c.commit();
                     return ApplyStatus.APPLIED;

SHiNE-server/shine-server-db/src/main/java/shine/db/dao/UserAccessServersCurrentDAO.java

@@ -75,6 +75,35 @@ public final class UserAccessServersCurrentDAO {
         return result;
     }
 
+    /**
+     * Возвращает уникальные физические серверы из текущей routing-проекции.
+     * Используется транспортным пулом: одно WSS-соединение держится на сервер,
+     * а не на каждого пользователя этого сервера.
+     */
+    public List<UserAccessServerRouteEntry> listDistinctServers() throws SQLException {
+        String sql = """
+            SELECT DISTINCT ON (LOWER(server_login))
+                   server_login, server_url
+            FROM user_access_servers_current
+            WHERE server_login IS NOT NULL AND BTRIM(server_login) <> ''
+              AND server_url IS NOT NULL AND BTRIM(server_url) <> ''
+            ORDER BY LOWER(server_login), server_login, server_url
+            """;
+        List<UserAccessServerRouteEntry> result = new ArrayList<>();
+        try (Connection c = db.getConnection();
+             PreparedStatement ps = c.prepareStatement(sql);
+             ResultSet rs = ps.executeQuery()) {
+            while (rs.next()) {
+                UserAccessServerRouteEntry entry = new UserAccessServerRouteEntry();
+                entry.setUserLogin("");
+                entry.setServerLogin(rs.getString("server_login"));
+                entry.setServerUrl(rs.getString("server_url"));
+                result.add(entry);
+            }
+        }
+        return result;
+    }
+
     private UserAccessServerRouteEntry mapRow(ResultSet rs) throws SQLException {
         UserAccessServerRouteEntry entry = new UserAccessServerRouteEntry();
         entry.setUserLogin(rs.getString("user_login"));

SHiNE-server/shine-server-db/src/main/java/shine/db/dao/UserNotificationsStateDAO.java

@@ -0,0 +1,105 @@
+package shine.db.dao;
+
+import shine.db.DbController;
+import shine.db.entities.UserNotificationEntry;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Types;
+import java.util.ArrayList;
+import java.util.List;
+
+public final class UserNotificationsStateDAO {
+    private static volatile UserNotificationsStateDAO instance;
+    private final DbController db = DbController.getInstance();
+
+    private UserNotificationsStateDAO() {}
+
+    public static UserNotificationsStateDAO getInstance() {
+        if (instance == null) {
+            synchronized (UserNotificationsStateDAO.class) {
+                if (instance == null) instance = new UserNotificationsStateDAO();
+            }
+        }
+        return instance;
+    }
+
+    public int upsert(Connection c, UserNotificationEntry e) throws SQLException {
+        String sql = """
+            INSERT INTO user_notifications_state (
+                owner_login, notification_kind, created_at_ms, source_login, source_bch_name,
+                source_block_number, source_block_hash, target_login, target_bch_name,
+                target_block_number, target_block_hash, source_msg_sub_type, source_text
+            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+            ON CONFLICT(owner_login, notification_kind, source_bch_name, source_block_number, source_block_hash) DO UPDATE SET
+                created_at_ms = EXCLUDED.created_at_ms,
+                source_login = EXCLUDED.source_login,
+                target_login = EXCLUDED.target_login,
+                target_bch_name = EXCLUDED.target_bch_name,
+                target_block_number = EXCLUDED.target_block_number,
+                target_block_hash = EXCLUDED.target_block_hash,
+                source_msg_sub_type = EXCLUDED.source_msg_sub_type,
+                source_text = EXCLUDED.source_text
+            """;
+        try (PreparedStatement ps = c.prepareStatement(sql)) {
+            int i = 1;
+            ps.setString(i++, e.getOwnerLogin());
+            ps.setString(i++, e.getNotificationKind());
+            ps.setLong(i++, e.getCreatedAtMs());
+            ps.setString(i++, e.getSourceLogin());
+            ps.setString(i++, e.getSourceBchName());
+            ps.setInt(i++, e.getSourceBlockNumber());
+            ps.setBytes(i++, e.getSourceBlockHash());
+            if (e.getTargetLogin() != null) ps.setString(i++, e.getTargetLogin()); else ps.setNull(i++, Types.VARCHAR);
+            if (e.getTargetBchName() != null) ps.setString(i++, e.getTargetBchName()); else ps.setNull(i++, Types.VARCHAR);
+            if (e.getTargetBlockNumber() != null) ps.setInt(i++, e.getTargetBlockNumber()); else ps.setNull(i++, Types.INTEGER);
+            if (e.getTargetBlockHash() != null) ps.setBytes(i++, e.getTargetBlockHash()); else ps.setNull(i++, Types.BINARY);
+            ps.setInt(i++, e.getSourceMsgSubType());
+            ps.setString(i++, e.getSourceText() == null ? "" : e.getSourceText());
+            return ps.executeUpdate();
+        }
+    }
+
+    public List<UserNotificationEntry> listByOwnerAndKind(Connection c, String ownerLogin, String kind, int limit) throws SQLException {
+        String sql = """
+            SELECT owner_login, notification_kind, created_at_ms, source_login, source_bch_name,
+                   source_block_number, source_block_hash, target_login, target_bch_name,
+                   target_block_number, target_block_hash, source_msg_sub_type, source_text
+            FROM user_notifications_state
+            WHERE owner_login = ? AND notification_kind = ?
+            ORDER BY created_at_ms DESC, source_block_number DESC
+            LIMIT ?
+            """;
+        List<UserNotificationEntry> out = new ArrayList<>();
+        try (PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setString(1, ownerLogin);
+            ps.setString(2, kind);
+            ps.setInt(3, Math.max(1, limit));
+            try (ResultSet rs = ps.executeQuery()) {
+                while (rs.next()) out.add(mapRow(rs));
+            }
+        }
+        return out;
+    }
+
+    private static UserNotificationEntry mapRow(ResultSet rs) throws SQLException {
+        UserNotificationEntry e = new UserNotificationEntry();
+        e.setOwnerLogin(rs.getString("owner_login"));
+        e.setNotificationKind(rs.getString("notification_kind"));
+        e.setCreatedAtMs(rs.getLong("created_at_ms"));
+        e.setSourceLogin(rs.getString("source_login"));
+        e.setSourceBchName(rs.getString("source_bch_name"));
+        e.setSourceBlockNumber(rs.getInt("source_block_number"));
+        e.setSourceBlockHash(rs.getBytes("source_block_hash"));
+        e.setTargetLogin(rs.getString("target_login"));
+        e.setTargetBchName(rs.getString("target_bch_name"));
+        Object targetBlockNumber = rs.getObject("target_block_number");
+        e.setTargetBlockNumber(targetBlockNumber == null ? null : ((Number) targetBlockNumber).intValue());
+        e.setTargetBlockHash(rs.getBytes("target_block_hash"));
+        e.setSourceMsgSubType(rs.getInt("source_msg_sub_type"));
+        e.setSourceText(rs.getString("source_text"));
+        return e;
+    }
+}

SHiNE-server/shine-server-db/src/main/java/shine/db/entities/DmDeliveryStateEntry.java

@@ -0,0 +1,84 @@
+package shine.db.entities;
+
+public class DmDeliveryStateEntry {
+    public static final int ACCEPTED = 0;
+    public static final int DELIVERED = 1;
+    public static final int FAILED = 3;
+
+    // Совместимость со строками БД, созданными ранней экспериментальной миграцией.
+    public static final int PENDING_NONE = ACCEPTED;
+    public static final int DELIVERED_ONE = DELIVERED;
+    public static final int DELIVERED_ALL = 2;
+    public static final int FAILED_FINAL = FAILED;
+
+    private String outgoingMessageKey;
+    private String eventId;
+    private String baseKey;
+    private String fromLogin;
+    private String toLogin;
+    private String incomingMessageKey;
+    private long createdAtMs;
+    private long deliveryExpiresAtMs;
+    private int deliveryState;
+    private String deliveredServerLogin;
+    private String recipientRoutesHash;
+    private int attemptIndex;
+    private Long nextAttemptAtMs;
+    private Long lastAttemptAtMs;
+    private String lastError;
+    private long updatedAtMs;
+
+    public String getOutgoingMessageKey() { return outgoingMessageKey; }
+    public void setOutgoingMessageKey(String value) { this.outgoingMessageKey = value; }
+    public String getEventId() { return eventId; }
+    public void setEventId(String value) { this.eventId = value; }
+    public String getBaseKey() { return baseKey; }
+    public void setBaseKey(String value) { this.baseKey = value; }
+    public String getFromLogin() { return fromLogin; }
+    public void setFromLogin(String value) { this.fromLogin = value; }
+    public String getToLogin() { return toLogin; }
+    public void setToLogin(String value) { this.toLogin = value; }
+    public String getIncomingMessageKey() { return incomingMessageKey; }
+    public void setIncomingMessageKey(String value) { this.incomingMessageKey = value; }
+    public long getCreatedAtMs() { return createdAtMs; }
+    public void setCreatedAtMs(long value) { this.createdAtMs = value; }
+    public long getDeliveryExpiresAtMs() { return deliveryExpiresAtMs; }
+    public void setDeliveryExpiresAtMs(long value) { this.deliveryExpiresAtMs = value; }
+    public int getDeliveryState() { return deliveryState; }
+    public void setDeliveryState(int value) { this.deliveryState = value; }
+    public String getDeliveredServerLogin() { return deliveredServerLogin; }
+    public void setDeliveredServerLogin(String value) { this.deliveredServerLogin = value; }
+    public String getRecipientRoutesHash() { return recipientRoutesHash; }
+    public void setRecipientRoutesHash(String value) { this.recipientRoutesHash = value; }
+    public int getAttemptIndex() { return attemptIndex; }
+    public void setAttemptIndex(int value) { this.attemptIndex = value; }
+    public Long getNextAttemptAtMs() { return nextAttemptAtMs; }
+    public void setNextAttemptAtMs(Long value) { this.nextAttemptAtMs = value; }
+    public Long getLastAttemptAtMs() { return lastAttemptAtMs; }
+    public void setLastAttemptAtMs(Long value) { this.lastAttemptAtMs = value; }
+    public String getLastError() { return lastError; }
+    public void setLastError(String value) { this.lastError = value; }
+    public long getUpdatedAtMs() { return updatedAtMs; }
+    public void setUpdatedAtMs(long value) { this.updatedAtMs = value; }
+
+    public String deliveryStateCode() {
+        return switch (deliveryState) {
+            case DELIVERED_ONE, DELIVERED_ALL -> "delivered";
+            case FAILED_FINAL -> "failed";
+            default -> "accepted";
+        };
+    }
+
+    public static int parseStateCode(String value) {
+        if (value == null) return ACCEPTED;
+        return switch (value.trim().toLowerCase()) {
+            case "delivered", "delivered_one", "delivered_all" -> DELIVERED;
+            case "failed", "failed_final" -> FAILED;
+            default -> ACCEPTED;
+        };
+    }
+
+    public boolean isDelivered() {
+        return deliveryState == DELIVERED_ONE || deliveryState == DELIVERED_ALL;
+    }
+}

SHiNE-server/shine-server-db/src/main/java/shine/db/entities/DmSyncOutboxEntry.java

@@ -0,0 +1,26 @@
+package shine.db.entities;
+
+public class DmSyncOutboxEntry {
+    private String ownerLogin;
+    private String primaryMessageKey;
+    private String eventId;
+    private String secondaryMessageKey;
+    private boolean synced;
+    private long createdAtMs;
+    private long updatedAtMs;
+
+    public String getOwnerLogin() { return ownerLogin; }
+    public void setOwnerLogin(String value) { this.ownerLogin = value; }
+    public String getPrimaryMessageKey() { return primaryMessageKey; }
+    public void setPrimaryMessageKey(String value) { this.primaryMessageKey = value; }
+    public String getEventId() { return eventId; }
+    public void setEventId(String value) { this.eventId = value; }
+    public String getSecondaryMessageKey() { return secondaryMessageKey; }
+    public void setSecondaryMessageKey(String value) { this.secondaryMessageKey = value; }
+    public boolean isSynced() { return synced; }
+    public void setSynced(boolean value) { this.synced = value; }
+    public long getCreatedAtMs() { return createdAtMs; }
+    public void setCreatedAtMs(long value) { this.createdAtMs = value; }
+    public long getUpdatedAtMs() { return updatedAtMs; }
+    public void setUpdatedAtMs(long value) { this.updatedAtMs = value; }
+}

SHiNE-server/shine-server-db/src/main/java/shine/db/entities/UserNotificationEntry.java

@@ -0,0 +1,44 @@
+package shine.db.entities;
+
+public class UserNotificationEntry {
+    private String ownerLogin;
+    private String notificationKind;
+    private long createdAtMs;
+    private String sourceLogin;
+    private String sourceBchName;
+    private int sourceBlockNumber;
+    private byte[] sourceBlockHash;
+    private String targetLogin;
+    private String targetBchName;
+    private Integer targetBlockNumber;
+    private byte[] targetBlockHash;
+    private int sourceMsgSubType;
+    private String sourceText;
+
+    public String getOwnerLogin() { return ownerLogin; }
+    public void setOwnerLogin(String ownerLogin) { this.ownerLogin = ownerLogin; }
+    public String getNotificationKind() { return notificationKind; }
+    public void setNotificationKind(String notificationKind) { this.notificationKind = notificationKind; }
+    public long getCreatedAtMs() { return createdAtMs; }
+    public void setCreatedAtMs(long createdAtMs) { this.createdAtMs = createdAtMs; }
+    public String getSourceLogin() { return sourceLogin; }
+    public void setSourceLogin(String sourceLogin) { this.sourceLogin = sourceLogin; }
+    public String getSourceBchName() { return sourceBchName; }
+    public void setSourceBchName(String sourceBchName) { this.sourceBchName = sourceBchName; }
+    public int getSourceBlockNumber() { return sourceBlockNumber; }
+    public void setSourceBlockNumber(int sourceBlockNumber) { this.sourceBlockNumber = sourceBlockNumber; }
+    public byte[] getSourceBlockHash() { return sourceBlockHash; }
+    public void setSourceBlockHash(byte[] sourceBlockHash) { this.sourceBlockHash = sourceBlockHash; }
+    public String getTargetLogin() { return targetLogin; }
+    public void setTargetLogin(String targetLogin) { this.targetLogin = targetLogin; }
+    public String getTargetBchName() { return targetBchName; }
+    public void setTargetBchName(String targetBchName) { this.targetBchName = targetBchName; }
+    public Integer getTargetBlockNumber() { return targetBlockNumber; }
+    public void setTargetBlockNumber(Integer targetBlockNumber) { this.targetBlockNumber = targetBlockNumber; }
+    public byte[] getTargetBlockHash() { return targetBlockHash; }
+    public void setTargetBlockHash(byte[] targetBlockHash) { this.targetBlockHash = targetBlockHash; }
+    public int getSourceMsgSubType() { return sourceMsgSubType; }
+    public void setSourceMsgSubType(int sourceMsgSubType) { this.sourceMsgSubType = sourceMsgSubType; }
+    public String getSourceText() { return sourceText; }
+    public void setSourceText(String sourceText) { this.sourceText = sourceText; }
+}

SHiNE-server/shine-server-db/src/main/resources/postgres/migration_v10.sql

@@ -0,0 +1,32 @@
+BEGIN;
+
+CREATE TABLE IF NOT EXISTS user_notifications_state (
+    owner_login           TEXT NOT NULL REFERENCES solana_user_pda_current(normalized_login),
+    notification_kind     TEXT NOT NULL CHECK (notification_kind IN ('reply', 'connection')),
+    created_at_ms         BIGINT NOT NULL,
+    source_login          TEXT NOT NULL,
+    source_bch_name       TEXT NOT NULL,
+    source_block_number   INTEGER NOT NULL CHECK (source_block_number >= 0),
+    source_block_hash     BYTEA NOT NULL,
+    target_login          TEXT,
+    target_bch_name       TEXT,
+    target_block_number   INTEGER,
+    target_block_hash     BYTEA,
+    source_msg_sub_type   INTEGER NOT NULL,
+    source_text           TEXT NOT NULL DEFAULT '',
+    UNIQUE (owner_login, notification_kind, source_bch_name, source_block_number, source_block_hash)
+);
+
+CREATE INDEX IF NOT EXISTS idx_user_notifications_state_owner_kind_time
+    ON user_notifications_state(owner_login, notification_kind, created_at_ms DESC, source_block_number DESC);
+
+CREATE INDEX IF NOT EXISTS idx_user_notifications_state_owner_time
+    ON user_notifications_state(owner_login, created_at_ms DESC);
+
+INSERT INTO db_schema_version (id, schema_version, updated_at_ms)
+VALUES (1, 10, CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT))
+ON CONFLICT (id) DO UPDATE SET
+    schema_version = EXCLUDED.schema_version,
+    updated_at_ms = EXCLUDED.updated_at_ms;
+
+COMMIT;

SHiNE-server/shine-server-db/src/main/resources/postgres/migration_v11.sql

@@ -0,0 +1,30 @@
+BEGIN;
+
+CREATE TABLE IF NOT EXISTS dm_dialog_state (
+    owner_login                   TEXT NOT NULL,
+    peer_login                    TEXT NOT NULL,
+    relation_flag                 TEXT NOT NULL DEFAULT 'none',
+    last_message_blob_b64         TEXT NOT NULL DEFAULT '',
+    last_message_key              TEXT NOT NULL DEFAULT '',
+    last_message_type             INTEGER NOT NULL DEFAULT 0,
+    last_message_time_ms          BIGINT NOT NULL DEFAULT 0,
+    last_message_revision_ms      BIGINT NOT NULL DEFAULT 0,
+    unread_count                  INTEGER NOT NULL DEFAULT 0,
+    last_read_receipt_time_ms     BIGINT NOT NULL DEFAULT 0,
+    updated_at_ms                 BIGINT NOT NULL,
+    PRIMARY KEY (owner_login, peer_login)
+);
+
+ALTER TABLE IF EXISTS dm_dialog_state
+    ADD COLUMN IF NOT EXISTS last_message_blob_b64 TEXT NOT NULL DEFAULT '';
+
+CREATE INDEX IF NOT EXISTS idx_dm_dialog_state_owner_last_time
+    ON dm_dialog_state(owner_login, last_message_time_ms DESC, peer_login);
+
+INSERT INTO db_schema_version (id, schema_version, updated_at_ms)
+VALUES (1, 11, CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT))
+ON CONFLICT (id) DO UPDATE SET
+    schema_version = EXCLUDED.schema_version,
+    updated_at_ms = EXCLUDED.updated_at_ms;
+
+COMMIT;

SHiNE-server/shine-server-db/src/main/resources/postgres/migration_v12.sql

@@ -0,0 +1,139 @@
+BEGIN;
+
+CREATE TABLE IF NOT EXISTS dm_delivery_state (
+    outgoing_message_key      TEXT PRIMARY KEY,
+    event_id                  TEXT NOT NULL UNIQUE,
+    base_key                  TEXT NOT NULL,
+    from_login                TEXT NOT NULL,
+    to_login                  TEXT NOT NULL,
+    incoming_message_key      TEXT NOT NULL,
+    created_at_ms             BIGINT NOT NULL,
+    delivery_expires_at_ms    BIGINT NOT NULL,
+    delivery_state            INTEGER NOT NULL DEFAULT 0 CHECK (delivery_state IN (0, 1, 2, 3)),
+    delivered_server_login    TEXT,
+    recipient_routes_hash     TEXT,
+    attempt_index             INTEGER NOT NULL DEFAULT 0,
+    next_attempt_at_ms        BIGINT,
+    last_attempt_at_ms        BIGINT,
+    last_error                TEXT,
+    updated_at_ms             BIGINT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_dm_delivery_state_due
+    ON dm_delivery_state(next_attempt_at_ms, delivery_state)
+    WHERE delivery_state = 0 AND next_attempt_at_ms IS NOT NULL;
+
+CREATE INDEX IF NOT EXISTS idx_dm_delivery_state_base
+    ON dm_delivery_state(base_key, from_login);
+
+CREATE TABLE IF NOT EXISTS dm_sync_outbox (
+    owner_login               TEXT NOT NULL,
+    primary_message_key       TEXT NOT NULL,
+    event_id                  TEXT NOT NULL,
+    secondary_message_key     TEXT,
+    synced                    BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at_ms             BIGINT NOT NULL,
+    updated_at_ms             BIGINT NOT NULL,
+    PRIMARY KEY (owner_login, primary_message_key)
+);
+
+CREATE INDEX IF NOT EXISTS idx_dm_sync_outbox_unsynced
+    ON dm_sync_outbox(owner_login, created_at_ms, primary_message_key)
+    WHERE synced = FALSE;
+
+-- До v12 факт межсерверной доставки не сохранялся. Старые исходящие пары
+-- считаем уже доставленными, чтобы обновление не вызвало повторную рассылку.
+INSERT INTO dm_delivery_state (
+    outgoing_message_key, event_id, base_key, from_login, to_login,
+    incoming_message_key, created_at_ms, delivery_expires_at_ms,
+    delivery_state, delivered_server_login, recipient_routes_hash,
+    attempt_index, next_attempt_at_ms, last_attempt_at_ms, last_error, updated_at_ms
+)
+SELECT
+    outgoing.message_key,
+    outgoing.message_key || ':' || outgoing.revision_time_ms || ':' || outgoing.reencrypted_at_ms,
+    outgoing.base_key,
+    outgoing.from_login,
+    outgoing.to_login,
+    incoming.message_key,
+    outgoing.created_at_ms,
+    outgoing.created_at_ms + 3600000,
+    2,
+    NULL,
+    NULL,
+    9,
+    NULL,
+    NULL,
+    'MIGRATED_AS_DELIVERED',
+    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+FROM signed_messages outgoing
+JOIN signed_messages incoming
+  ON incoming.base_key = outgoing.base_key
+ AND incoming.message_type = outgoing.message_type - 1
+WHERE outgoing.message_type IN (2, 4)
+ON CONFLICT (outgoing_message_key) DO NOTHING;
+
+-- Историю до v12 считаем подтверждённой, иначе само обновление вызовет
+-- массовую повторную передачу. При замене сервера общий reset вернёт FALSE.
+INSERT INTO dm_sync_outbox (
+    owner_login, primary_message_key, event_id, secondary_message_key,
+    synced, created_at_ms, updated_at_ms
+)
+SELECT
+    LOWER(outgoing.from_login),
+    outgoing.message_key,
+    outgoing.message_key || ':' || outgoing.revision_time_ms || ':' || outgoing.reencrypted_at_ms,
+    incoming.message_key,
+    TRUE,
+    outgoing.created_at_ms,
+    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+FROM signed_messages outgoing
+JOIN signed_messages incoming
+  ON incoming.base_key = outgoing.base_key
+ AND incoming.message_type = outgoing.message_type - 1
+WHERE outgoing.message_type IN (2, 4)
+ON CONFLICT (owner_login, primary_message_key) DO NOTHING;
+
+-- Входящая копия синхронизируется отдельно между серверами получателя.
+INSERT INTO dm_sync_outbox (
+    owner_login, primary_message_key, event_id, secondary_message_key,
+    synced, created_at_ms, updated_at_ms
+)
+SELECT
+    LOWER(incoming.to_login),
+    incoming.message_key,
+    incoming.message_key || ':' || incoming.revision_time_ms || ':' || incoming.reencrypted_at_ms,
+    NULL,
+    TRUE,
+    incoming.created_at_ms,
+    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+FROM signed_messages incoming
+WHERE incoming.message_type IN (1, 3)
+ON CONFLICT (owner_login, primary_message_key) DO NOTHING;
+
+-- Tombstone принадлежит обоим участникам и должен попасть на второй сервер
+-- каждого из них. Для self-DM конфликт безопасно схлопывается.
+INSERT INTO dm_sync_outbox (
+    owner_login, primary_message_key, event_id, secondary_message_key,
+    synced, created_at_ms, updated_at_ms
+)
+SELECT
+    LOWER(owner_login),
+    tombstone.message_key,
+    tombstone.message_key || ':' || tombstone.revision_time_ms || ':' || tombstone.reencrypted_at_ms,
+    NULL,
+    TRUE,
+    tombstone.created_at_ms,
+    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+FROM signed_messages tombstone
+CROSS JOIN LATERAL (VALUES (tombstone.from_login), (tombstone.to_login)) owners(owner_login)
+WHERE tombstone.message_type IN (5, 6, 7, 8)
+ON CONFLICT (owner_login, primary_message_key) DO NOTHING;
+
+INSERT INTO db_schema_version (id, schema_version, updated_at_ms)
+VALUES (1, 12, CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT))
+ON CONFLICT (id) DO UPDATE SET
+    schema_version = EXCLUDED.schema_version,
+    updated_at_ms = EXCLUDED.updated_at_ms;
+
+COMMIT;

SHiNE-server/shine-server-db/src/main/resources/postgres/migration_v13.sql

@@ -0,0 +1,46 @@
+BEGIN;
+
+-- Нормализация экспериментальной схемы доставки v12:
+-- 0=accepted, 1=delivered, 3=failed. Старое delivered_all (2)
+-- объединяется с delivered, поскольку ACK одного сервера теперь достаточен.
+UPDATE dm_delivery_state
+SET delivery_state = 1,
+    delivered_server_login = NULL,
+    next_attempt_at_ms = NULL,
+    updated_at_ms = CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+WHERE delivery_state = 2;
+
+-- Для незавершённых записей перестраиваем только будущую очередь. Повторная
+-- передача безопасна благодаря messageKey и идемпотентному приёму.
+UPDATE dm_delivery_state
+SET delivery_expires_at_ms = created_at_ms + 3600000,
+    attempt_index = CASE
+        WHEN CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT) >= created_at_ms + 3600000 THEN 4
+        WHEN CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT) >= created_at_ms + 1500000 THEN 3
+        WHEN CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT) >= created_at_ms + 300000 THEN 2
+        ELSE 1
+    END,
+    next_attempt_at_ms = CASE
+        WHEN CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT) >= created_at_ms + 3600000
+            THEN CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+        WHEN CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT) >= created_at_ms + 1500000
+            THEN created_at_ms + 3600000
+        WHEN CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT) >= created_at_ms + 300000
+            THEN created_at_ms + 1500000
+        ELSE created_at_ms + 30000
+    END,
+    updated_at_ms = CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+WHERE delivery_state = 0;
+
+DROP INDEX IF EXISTS idx_dm_delivery_state_due;
+CREATE INDEX idx_dm_delivery_state_due
+    ON dm_delivery_state(next_attempt_at_ms, delivery_state)
+    WHERE delivery_state = 0 AND next_attempt_at_ms IS NOT NULL;
+
+INSERT INTO db_schema_version (id, schema_version, updated_at_ms)
+VALUES (1, 13, CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT))
+ON CONFLICT (id) DO UPDATE SET
+    schema_version = EXCLUDED.schema_version,
+    updated_at_ms = EXCLUDED.updated_at_ms;
+
+COMMIT;

SHiNE-server/shine-server-db/src/main/resources/postgres/migration_v14.sql

@@ -0,0 +1,620 @@
+BEGIN;
+
+CREATE TABLE IF NOT EXISTS user_stats_state (
+    login                       TEXT PRIMARY KEY REFERENCES solana_user_pda_current(login) ON DELETE CASCADE,
+    owned_public_channels_count INTEGER NOT NULL DEFAULT 0 CHECK (owned_public_channels_count >= 0),
+    following_users_count       INTEGER NOT NULL DEFAULT 0 CHECK (following_users_count >= 0),
+    following_channels_count    INTEGER NOT NULL DEFAULT 0 CHECK (following_channels_count >= 0),
+    close_friends_count         INTEGER NOT NULL DEFAULT 0 CHECK (close_friends_count >= 0),
+    updated_at_ms               BIGINT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_user_stats_state_following_users_count
+    ON user_stats_state (following_users_count);
+
+CREATE TABLE IF NOT EXISTS channel_stats_state (
+    owner_bch_name            TEXT NOT NULL,
+    channel_root_block_number INTEGER NOT NULL CHECK (channel_root_block_number >= 0),
+    channel_root_block_hash   BYTEA NOT NULL,
+    owner_login               TEXT NOT NULL,
+    channel_type_code         INTEGER NOT NULL DEFAULT 1,
+    subscribers_count         INTEGER NOT NULL DEFAULT 0 CHECK (subscribers_count >= 0),
+    updated_at_ms             BIGINT NOT NULL,
+    PRIMARY KEY (owner_bch_name, channel_root_block_number, channel_root_block_hash)
+);
+
+CREATE INDEX IF NOT EXISTS idx_channel_stats_state_owner_login
+    ON channel_stats_state (owner_login);
+
+CREATE OR REPLACE FUNCTION shine_user_stats_state_ai()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    now_ms BIGINT;
+BEGIN
+    now_ms := CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT);
+
+    INSERT INTO user_stats_state (
+        login,
+        owned_public_channels_count,
+        following_users_count,
+        following_channels_count,
+        close_friends_count,
+        updated_at_ms
+    ) VALUES (
+        NEW.login,
+        0,
+        0,
+        0,
+        0,
+        now_ms
+    )
+    ON CONFLICT (login) DO NOTHING;
+
+    RETURN NEW;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION shine_channel_names_state_stats_ai()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    now_ms BIGINT;
+    public_subscribers_count INTEGER;
+BEGIN
+    now_ms := CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT);
+
+    IF NEW.owner_login IS NULL OR btrim(NEW.owner_login) = '' THEN
+        RETURN NEW;
+    END IF;
+
+    IF NEW.channel_type_code = 1 THEN
+        INSERT INTO user_stats_state (
+            login,
+            owned_public_channels_count,
+            following_users_count,
+            following_channels_count,
+            close_friends_count,
+            updated_at_ms
+        ) VALUES (
+            NEW.owner_login,
+            1,
+            0,
+            0,
+            0,
+            now_ms
+        )
+        ON CONFLICT (login) DO UPDATE SET
+            owned_public_channels_count = user_stats_state.owned_public_channels_count + 1,
+            updated_at_ms = EXCLUDED.updated_at_ms;
+
+        SELECT COUNT(*)::INTEGER
+        INTO public_subscribers_count
+        FROM connections_state cs
+        JOIN channel_names_state cn
+          ON cn.owner_bch_name = cs.to_bch_name
+         AND cn.channel_root_block_number = cs.to_block_number
+         AND cn.channel_root_block_hash = cs.to_block_hash
+        WHERE cs.rel_type = 30
+          AND cn.owner_bch_name = NEW.owner_bch_name
+          AND cn.channel_root_block_number = NEW.channel_root_block_number
+          AND cn.channel_root_block_hash = NEW.channel_root_block_hash
+          AND cn.channel_type_code = 1;
+
+        INSERT INTO channel_stats_state (
+            owner_bch_name,
+            channel_root_block_number,
+            channel_root_block_hash,
+            owner_login,
+            channel_type_code,
+            subscribers_count,
+            updated_at_ms
+        ) VALUES (
+            NEW.owner_bch_name,
+            NEW.channel_root_block_number,
+            NEW.channel_root_block_hash,
+            NEW.owner_login,
+            NEW.channel_type_code,
+            COALESCE(public_subscribers_count, 0),
+            now_ms
+        )
+        ON CONFLICT (owner_bch_name, channel_root_block_number, channel_root_block_hash) DO UPDATE SET
+            owner_login = EXCLUDED.owner_login,
+            channel_type_code = EXCLUDED.channel_type_code,
+            subscribers_count = EXCLUDED.subscribers_count,
+            updated_at_ms = EXCLUDED.updated_at_ms;
+    ELSE
+        WITH pending AS (
+            SELECT cs.login, COUNT(*)::INTEGER AS cnt
+            FROM connections_state cs
+            WHERE cs.rel_type = 30
+              AND cs.to_bch_name = NEW.owner_bch_name
+              AND cs.to_block_number = NEW.channel_root_block_number
+              AND cs.to_block_hash = NEW.channel_root_block_hash
+            GROUP BY cs.login
+        )
+        UPDATE user_stats_state us
+        SET following_channels_count = GREATEST(0, us.following_channels_count - pending.cnt),
+            updated_at_ms = now_ms
+        FROM pending
+        WHERE us.login = pending.login;
+    END IF;
+
+    RETURN NEW;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION shine_blocks_connection_state_ai()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    resolved_login TEXT;
+    positive_rel_type INTEGER;
+    existed_before BOOLEAN;
+    target_channel_type INTEGER;
+BEGIN
+    IF NEW.msg_type <> 3 THEN
+        RETURN NEW;
+    END IF;
+
+    resolved_login := shine_resolve_login(NEW.to_login, NEW.to_bch_name);
+
+    IF NEW.msg_sub_type IN (10, 20, 30, 40, 50, 52, 54, 60, 70, 74) THEN
+        IF resolved_login IS NULL OR NEW.to_bch_name IS NULL THEN
+            RETURN NEW;
+        END IF;
+
+        SELECT EXISTS (
+            SELECT 1
+            FROM connections_state
+            WHERE login = NEW.login
+              AND rel_type = NEW.msg_sub_type
+              AND to_login = resolved_login
+              AND to_bch_name = NEW.to_bch_name
+              AND to_block_number = COALESCE(NEW.to_block_number, 0)
+              AND to_block_hash = COALESCE(NEW.to_block_hash, decode(repeat('00', 32), 'hex'))
+        )
+        INTO existed_before;
+
+        IF NOT existed_before THEN
+            IF NEW.msg_sub_type = 10 THEN
+                INSERT INTO user_stats_state (
+                    login,
+                    owned_public_channels_count,
+                    following_users_count,
+                    following_channels_count,
+                    close_friends_count,
+                    updated_at_ms
+                ) VALUES (
+                    NEW.login,
+                    0,
+                    0,
+                    0,
+                    1,
+                    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                )
+                ON CONFLICT (login) DO UPDATE SET
+                    close_friends_count = user_stats_state.close_friends_count + 1,
+                    updated_at_ms = EXCLUDED.updated_at_ms;
+            ELSIF NEW.msg_sub_type = 30 THEN
+                IF NEW.to_block_number IS NULL THEN
+                    INSERT INTO user_stats_state (
+                        login,
+                        owned_public_channels_count,
+                        following_users_count,
+                        following_channels_count,
+                        close_friends_count,
+                        updated_at_ms
+                    ) VALUES (
+                        NEW.login,
+                        0,
+                        0,
+                        1,
+                        0,
+                        CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                    )
+                    ON CONFLICT (login) DO UPDATE SET
+                        following_channels_count = user_stats_state.following_channels_count + 1,
+                        updated_at_ms = EXCLUDED.updated_at_ms;
+                ELSIF NEW.to_block_number = 0 THEN
+                    INSERT INTO user_stats_state (
+                        login,
+                        owned_public_channels_count,
+                        following_users_count,
+                        following_channels_count,
+                        close_friends_count,
+                        updated_at_ms
+                    ) VALUES (
+                        NEW.login,
+                        0,
+                        1,
+                        0,
+                        0,
+                        CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                    )
+                    ON CONFLICT (login) DO UPDATE SET
+                        following_users_count = user_stats_state.following_users_count + 1,
+                        updated_at_ms = EXCLUDED.updated_at_ms;
+                ELSE
+                    SELECT cn.channel_type_code
+                    INTO target_channel_type
+                    FROM channel_names_state cn
+                    WHERE cn.owner_bch_name = NEW.to_bch_name
+                      AND cn.channel_root_block_number = NEW.to_block_number
+                      AND cn.channel_root_block_hash = NEW.to_block_hash
+                    LIMIT 1;
+
+                    IF target_channel_type = 1 THEN
+                        INSERT INTO user_stats_state (
+                            login,
+                            owned_public_channels_count,
+                            following_users_count,
+                            following_channels_count,
+                            close_friends_count,
+                            updated_at_ms
+                        ) VALUES (
+                            NEW.login,
+                            0,
+                            0,
+                            1,
+                            0,
+                            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                        )
+                        ON CONFLICT (login) DO UPDATE SET
+                            following_channels_count = user_stats_state.following_channels_count + 1,
+                            updated_at_ms = EXCLUDED.updated_at_ms;
+
+                        INSERT INTO channel_stats_state (
+                            owner_bch_name,
+                            channel_root_block_number,
+                            channel_root_block_hash,
+                            owner_login,
+                            channel_type_code,
+                            subscribers_count,
+                            updated_at_ms
+                        ) VALUES (
+                            NEW.to_bch_name,
+                            NEW.to_block_number,
+                            NEW.to_block_hash,
+                            resolved_login,
+                            target_channel_type,
+                            1,
+                            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                        )
+                        ON CONFLICT (owner_bch_name, channel_root_block_number, channel_root_block_hash) DO UPDATE SET
+                            owner_login = EXCLUDED.owner_login,
+                            channel_type_code = EXCLUDED.channel_type_code,
+                            subscribers_count = channel_stats_state.subscribers_count + 1,
+                            updated_at_ms = EXCLUDED.updated_at_ms;
+                    ELSIF target_channel_type IS NULL THEN
+                        INSERT INTO user_stats_state (
+                            login,
+                            owned_public_channels_count,
+                            following_users_count,
+                            following_channels_count,
+                            close_friends_count,
+                            updated_at_ms
+                        ) VALUES (
+                            NEW.login,
+                            0,
+                            0,
+                            1,
+                            0,
+                            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                        )
+                        ON CONFLICT (login) DO UPDATE SET
+                            following_channels_count = user_stats_state.following_channels_count + 1,
+                            updated_at_ms = EXCLUDED.updated_at_ms;
+                    END IF;
+                END IF;
+            END IF;
+        END IF;
+
+        DELETE FROM connections_state
+        WHERE login = NEW.login
+          AND rel_type = NEW.msg_sub_type
+          AND to_login = resolved_login
+          AND to_bch_name = NEW.to_bch_name
+          AND to_block_number = COALESCE(NEW.to_block_number, 0)
+          AND to_block_hash = COALESCE(NEW.to_block_hash, decode(repeat('00', 32), 'hex'));
+
+        INSERT INTO connections_state (
+            login, rel_type, to_login, to_bch_name, to_block_number, to_block_hash
+        ) VALUES (
+            NEW.login,
+            NEW.msg_sub_type,
+            resolved_login,
+            NEW.to_bch_name,
+            COALESCE(NEW.to_block_number, 0),
+            COALESCE(NEW.to_block_hash, decode(repeat('00', 32), 'hex'))
+        );
+
+        RETURN NEW;
+    END IF;
+
+    positive_rel_type := CASE NEW.msg_sub_type
+        WHEN 11 THEN 10
+        WHEN 21 THEN 20
+        WHEN 31 THEN 30
+        WHEN 41 THEN 40
+        WHEN 51 THEN 50
+        WHEN 53 THEN 52
+        WHEN 55 THEN 54
+        WHEN 61 THEN 60
+        WHEN 71 THEN 70
+        WHEN 75 THEN 74
+        ELSE NULL
+    END;
+
+    IF positive_rel_type IS NULL OR resolved_login IS NULL THEN
+        RETURN NEW;
+    END IF;
+
+    SELECT EXISTS (
+        SELECT 1
+        FROM connections_state
+        WHERE login = NEW.login
+          AND rel_type = positive_rel_type
+          AND to_login = resolved_login
+          AND to_bch_name = NEW.to_bch_name
+          AND to_block_number = COALESCE(NEW.to_block_number, 0)
+          AND to_block_hash = COALESCE(NEW.to_block_hash, decode(repeat('00', 32), 'hex'))
+    )
+    INTO existed_before;
+
+    IF NOT existed_before THEN
+        RETURN NEW;
+    END IF;
+
+    IF positive_rel_type = 10 THEN
+        INSERT INTO user_stats_state (
+            login,
+            owned_public_channels_count,
+            following_users_count,
+            following_channels_count,
+            close_friends_count,
+            updated_at_ms
+        ) VALUES (
+            NEW.login,
+            0,
+            0,
+            0,
+            0,
+            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+        )
+        ON CONFLICT (login) DO UPDATE SET
+            close_friends_count = GREATEST(0, user_stats_state.close_friends_count - 1),
+            updated_at_ms = EXCLUDED.updated_at_ms;
+    ELSIF positive_rel_type = 30 THEN
+        IF NEW.to_block_number IS NULL THEN
+            INSERT INTO user_stats_state (
+                login,
+                owned_public_channels_count,
+                following_users_count,
+                following_channels_count,
+                close_friends_count,
+                updated_at_ms
+        ) VALUES (
+            NEW.login,
+            0,
+            0,
+            0,
+            0,
+            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+        )
+            ON CONFLICT (login) DO UPDATE SET
+                following_channels_count = GREATEST(0, user_stats_state.following_channels_count - 1),
+                updated_at_ms = EXCLUDED.updated_at_ms;
+        ELSIF NEW.to_block_number = 0 THEN
+            INSERT INTO user_stats_state (
+                login,
+                owned_public_channels_count,
+                following_users_count,
+                following_channels_count,
+                close_friends_count,
+                updated_at_ms
+        ) VALUES (
+            NEW.login,
+            0,
+            0,
+            0,
+            0,
+            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+        )
+            ON CONFLICT (login) DO UPDATE SET
+                following_users_count = GREATEST(0, user_stats_state.following_users_count - 1),
+                updated_at_ms = EXCLUDED.updated_at_ms;
+        ELSE
+            SELECT cn.channel_type_code
+            INTO target_channel_type
+            FROM channel_names_state cn
+            WHERE cn.owner_bch_name = NEW.to_bch_name
+              AND cn.channel_root_block_number = NEW.to_block_number
+              AND cn.channel_root_block_hash = NEW.to_block_hash
+            LIMIT 1;
+
+            IF target_channel_type = 1 THEN
+                INSERT INTO user_stats_state (
+                    login,
+                    owned_public_channels_count,
+                    following_users_count,
+                    following_channels_count,
+                    close_friends_count,
+                    updated_at_ms
+                ) VALUES (
+                    NEW.login,
+                    0,
+                    0,
+                    0,
+                    0,
+                    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                )
+                ON CONFLICT (login) DO UPDATE SET
+                    following_channels_count = GREATEST(0, user_stats_state.following_channels_count - 1),
+                    updated_at_ms = EXCLUDED.updated_at_ms;
+
+                INSERT INTO channel_stats_state (
+                    owner_bch_name,
+                    channel_root_block_number,
+                    channel_root_block_hash,
+                    owner_login,
+                    channel_type_code,
+                    subscribers_count,
+                    updated_at_ms
+                ) VALUES (
+                    NEW.to_bch_name,
+                    NEW.to_block_number,
+                    NEW.to_block_hash,
+                    resolved_login,
+                    target_channel_type,
+                    0,
+                    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                )
+                ON CONFLICT (owner_bch_name, channel_root_block_number, channel_root_block_hash) DO UPDATE SET
+                    owner_login = EXCLUDED.owner_login,
+                    channel_type_code = EXCLUDED.channel_type_code,
+                    subscribers_count = GREATEST(0, channel_stats_state.subscribers_count - 1),
+                    updated_at_ms = EXCLUDED.updated_at_ms;
+            ELSIF target_channel_type IS NULL THEN
+                INSERT INTO user_stats_state (
+                    login,
+                    owned_public_channels_count,
+                    following_users_count,
+                    following_channels_count,
+                    close_friends_count,
+                    updated_at_ms
+                ) VALUES (
+                    NEW.login,
+                    0,
+                    0,
+                    0,
+                    0,
+                    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                )
+                ON CONFLICT (login) DO UPDATE SET
+                    following_channels_count = GREATEST(0, user_stats_state.following_channels_count - 1),
+                    updated_at_ms = EXCLUDED.updated_at_ms;
+            END IF;
+        END IF;
+    END IF;
+
+    DELETE FROM connections_state
+    WHERE login = NEW.login
+      AND rel_type = positive_rel_type
+      AND to_login = resolved_login
+      AND to_bch_name = NEW.to_bch_name
+      AND to_block_number = COALESCE(NEW.to_block_number, 0)
+      AND to_block_hash = COALESCE(NEW.to_block_hash, decode(repeat('00', 32), 'hex'));
+
+    RETURN NEW;
+END;
+$$;
+
+DROP TRIGGER IF EXISTS trg_user_stats_state_ai ON solana_user_pda_current;
+CREATE TRIGGER trg_user_stats_state_ai
+AFTER INSERT ON solana_user_pda_current
+FOR EACH ROW
+EXECUTE FUNCTION shine_user_stats_state_ai();
+
+DROP TRIGGER IF EXISTS trg_channel_names_state_stats_ai ON channel_names_state;
+CREATE TRIGGER trg_channel_names_state_stats_ai
+AFTER INSERT ON channel_names_state
+FOR EACH ROW
+EXECUTE FUNCTION shine_channel_names_state_stats_ai();
+
+DROP TRIGGER IF EXISTS trg_blocks_connection_state_ai ON blocks;
+CREATE TRIGGER trg_blocks_connection_state_ai
+AFTER INSERT ON blocks
+FOR EACH ROW
+EXECUTE FUNCTION shine_blocks_connection_state_ai();
+
+TRUNCATE TABLE user_stats_state, channel_stats_state;
+
+INSERT INTO user_stats_state (
+    login,
+    owned_public_channels_count,
+    following_users_count,
+    following_channels_count,
+    close_friends_count,
+    updated_at_ms
+)
+SELECT
+    u.login,
+    COALESCE(own.owned_public_channels_count, 0) AS owned_public_channels_count,
+    COALESCE(fu.following_users_count, 0) AS following_users_count,
+    COALESCE(fc.following_channels_count, 0) AS following_channels_count,
+    COALESCE(cf.close_friends_count, 0) AS close_friends_count,
+    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT) AS updated_at_ms
+FROM solana_user_pda_current u
+LEFT JOIN (
+    SELECT owner_login, COUNT(*)::INTEGER AS owned_public_channels_count
+    FROM channel_names_state
+    WHERE channel_type_code = 1
+    GROUP BY owner_login
+) own ON LOWER(own.owner_login) = LOWER(u.login)
+LEFT JOIN (
+    SELECT login, COUNT(*)::INTEGER AS following_users_count
+    FROM connections_state
+    WHERE rel_type = 30
+      AND to_block_number = 0
+    GROUP BY login
+) fu ON LOWER(fu.login) = LOWER(u.login)
+LEFT JOIN (
+    SELECT cs.login, COUNT(*)::INTEGER AS following_channels_count
+    FROM connections_state cs
+    JOIN channel_names_state cn
+      ON cn.owner_bch_name = cs.to_bch_name
+     AND cn.channel_root_block_number = cs.to_block_number
+     AND cn.channel_root_block_hash = cs.to_block_hash
+    WHERE cs.rel_type = 30
+      AND cn.channel_type_code = 1
+    GROUP BY cs.login
+) fc ON LOWER(fc.login) = LOWER(u.login)
+LEFT JOIN (
+    SELECT login, COUNT(*)::INTEGER AS close_friends_count
+    FROM connections_state
+    WHERE rel_type = 10
+    GROUP BY login
+) cf ON LOWER(cf.login) = LOWER(u.login);
+
+INSERT INTO channel_stats_state (
+    owner_bch_name,
+    channel_root_block_number,
+    channel_root_block_hash,
+    owner_login,
+    channel_type_code,
+    subscribers_count,
+    updated_at_ms
+)
+SELECT
+    cn.owner_bch_name,
+    cn.channel_root_block_number,
+    cn.channel_root_block_hash,
+    cn.owner_login,
+    cn.channel_type_code,
+    COUNT(DISTINCT cs.login)::INTEGER AS subscribers_count,
+    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT) AS updated_at_ms
+FROM channel_names_state cn
+LEFT JOIN connections_state cs
+  ON cs.rel_type = 30
+ AND cs.to_bch_name = cn.owner_bch_name
+ AND cs.to_block_number = cn.channel_root_block_number
+ AND cs.to_block_hash = cn.channel_root_block_hash
+WHERE cn.channel_type_code = 1
+GROUP BY
+    cn.owner_bch_name,
+    cn.channel_root_block_number,
+    cn.channel_root_block_hash,
+    cn.owner_login,
+    cn.channel_type_code;
+
+INSERT INTO db_schema_version (id, schema_version, updated_at_ms)
+VALUES (1, 14, CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT))
+ON CONFLICT (id) DO UPDATE SET
+    schema_version = EXCLUDED.schema_version,
+    updated_at_ms = EXCLUDED.updated_at_ms;
+
+COMMIT;

SHiNE-server/shine-server-db/src/main/resources/postgres/migration_v15.sql

@@ -0,0 +1,105 @@
+BEGIN;
+
+CREATE OR REPLACE FUNCTION shine_channel_names_state_stats_ai()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    now_ms BIGINT;
+    public_subscribers_count INTEGER;
+BEGIN
+    now_ms := CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT);
+
+    IF NEW.owner_login IS NULL OR btrim(NEW.owner_login) = '' THEN
+        RETURN NEW;
+    END IF;
+
+    IF NEW.channel_type_code = 1 THEN
+        IF EXISTS (
+            SELECT 1
+            FROM solana_user_pda_current su
+            WHERE su.login = NEW.owner_login
+        ) THEN
+            INSERT INTO user_stats_state (
+                login,
+                owned_public_channels_count,
+                following_users_count,
+                following_channels_count,
+                close_friends_count,
+                updated_at_ms
+            ) VALUES (
+                NEW.owner_login,
+                1,
+                0,
+                0,
+                0,
+                now_ms
+            )
+            ON CONFLICT (login) DO UPDATE SET
+                owned_public_channels_count = user_stats_state.owned_public_channels_count + 1,
+                updated_at_ms = EXCLUDED.updated_at_ms;
+        END IF;
+
+        SELECT COUNT(*)::INTEGER
+        INTO public_subscribers_count
+        FROM connections_state cs
+        JOIN channel_names_state cn
+          ON cn.owner_bch_name = cs.to_bch_name
+         AND cn.channel_root_block_number = cs.to_block_number
+         AND cn.channel_root_block_hash = cs.to_block_hash
+        WHERE cs.rel_type = 30
+          AND cn.owner_bch_name = NEW.owner_bch_name
+          AND cn.channel_root_block_number = NEW.channel_root_block_number
+          AND cn.channel_root_block_hash = NEW.channel_root_block_hash
+          AND cn.channel_type_code = 1;
+
+        INSERT INTO channel_stats_state (
+            owner_bch_name,
+            channel_root_block_number,
+            channel_root_block_hash,
+            owner_login,
+            channel_type_code,
+            subscribers_count,
+            updated_at_ms
+        ) VALUES (
+            NEW.owner_bch_name,
+            NEW.channel_root_block_number,
+            NEW.channel_root_block_hash,
+            NEW.owner_login,
+            NEW.channel_type_code,
+            COALESCE(public_subscribers_count, 0),
+            now_ms
+        )
+        ON CONFLICT (owner_bch_name, channel_root_block_number, channel_root_block_hash) DO UPDATE SET
+            owner_login = EXCLUDED.owner_login,
+            channel_type_code = EXCLUDED.channel_type_code,
+            subscribers_count = EXCLUDED.subscribers_count,
+            updated_at_ms = EXCLUDED.updated_at_ms;
+    ELSE
+        WITH pending AS (
+            SELECT cs.login, COUNT(*)::INTEGER AS cnt
+            FROM connections_state cs
+            WHERE cs.rel_type = 30
+              AND cs.to_bch_name = NEW.owner_bch_name
+              AND cs.to_block_number = NEW.channel_root_block_number
+              AND cs.to_block_hash = NEW.channel_root_block_hash
+            GROUP BY cs.login
+        )
+        UPDATE user_stats_state us
+        SET following_channels_count = GREATEST(0, us.following_channels_count - pending.cnt),
+            updated_at_ms = now_ms
+        FROM pending
+        WHERE us.login = pending.login;
+    END IF;
+
+    RETURN NEW;
+END;
+$$;
+
+INSERT INTO db_schema_version (id, schema_version, updated_at_ms)
+VALUES (1, 15, CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT))
+ON CONFLICT (id) DO UPDATE SET
+    schema_version = EXCLUDED.schema_version,
+    updated_at_ms = EXCLUDED.updated_at_ms;
+
+COMMIT;

SHiNE-server/shine-server-db/src/main/resources/postgres/schema_v1.sql

@@ -22,7 +22,7 @@ CREATE TABLE IF NOT EXISTS db_schema_version (
 );
 
 INSERT INTO db_schema_version (id, schema_version, updated_at_ms)
-    VALUES (1, 9, CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT))
+    VALUES (1, 13, CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT))
 ON CONFLICT (id) DO UPDATE SET
     schema_version = EXCLUDED.schema_version,
     updated_at_ms = EXCLUDED.updated_at_ms;
@@ -291,6 +291,12 @@ AFTER TRUNCATE ON solana_user_pda_current
 FOR EACH STATEMENT
 EXECUTE FUNCTION trg_refresh_user_access_servers_from_user_pda_truncate();
 
+DROP TRIGGER IF EXISTS trg_user_stats_state_ai ON solana_user_pda_current;
+CREATE TRIGGER trg_user_stats_state_ai
+AFTER INSERT ON solana_user_pda_current
+FOR EACH ROW
+EXECUTE FUNCTION shine_user_stats_state_ai();
+
 CREATE TABLE IF NOT EXISTS solana_user_pda_history (
     id                       BIGSERIAL PRIMARY KEY,
     tx_signature             TEXT NOT NULL,
@@ -605,6 +611,32 @@ CREATE UNIQUE INDEX IF NOT EXISTS uq_channel_names_state_target
 CREATE INDEX IF NOT EXISTS idx_channel_names_state_owner
     ON channel_names_state (owner_login, owner_bch_name);
 
+CREATE TABLE IF NOT EXISTS user_stats_state (
+    login                       TEXT PRIMARY KEY REFERENCES solana_user_pda_current(login) ON DELETE CASCADE,
+    owned_public_channels_count INTEGER NOT NULL DEFAULT 0 CHECK (owned_public_channels_count >= 0),
+    following_users_count       INTEGER NOT NULL DEFAULT 0 CHECK (following_users_count >= 0),
+    following_channels_count    INTEGER NOT NULL DEFAULT 0 CHECK (following_channels_count >= 0),
+    close_friends_count         INTEGER NOT NULL DEFAULT 0 CHECK (close_friends_count >= 0),
+    updated_at_ms               BIGINT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_user_stats_state_following_users_count
+    ON user_stats_state (following_users_count);
+
+CREATE TABLE IF NOT EXISTS channel_stats_state (
+    owner_bch_name            TEXT NOT NULL,
+    channel_root_block_number INTEGER NOT NULL CHECK (channel_root_block_number >= 0),
+    channel_root_block_hash   BYTEA NOT NULL,
+    owner_login               TEXT NOT NULL,
+    channel_type_code         INTEGER NOT NULL DEFAULT 1,
+    subscribers_count         INTEGER NOT NULL DEFAULT 0 CHECK (subscribers_count >= 0),
+    updated_at_ms             BIGINT NOT NULL,
+    PRIMARY KEY (owner_bch_name, channel_root_block_number, channel_root_block_hash)
+);
+
+CREATE INDEX IF NOT EXISTS idx_channel_stats_state_owner_login
+    ON channel_stats_state (owner_login);
+
 CREATE TABLE IF NOT EXISTS chat200_state (
     owner_login               TEXT NOT NULL,
     owner_bch_name            TEXT NOT NULL,
@@ -751,6 +783,47 @@ CREATE TABLE IF NOT EXISTS signed_message_session_delivery (
 CREATE INDEX IF NOT EXISTS idx_signed_message_delivery_session
     ON signed_message_session_delivery(session_id, delivered);
 
+CREATE TABLE IF NOT EXISTS user_notifications_state (
+    owner_login           TEXT NOT NULL REFERENCES solana_user_pda_current(normalized_login),
+    notification_kind     TEXT NOT NULL CHECK (notification_kind IN ('reply', 'connection')),
+    created_at_ms         BIGINT NOT NULL,
+    source_login          TEXT NOT NULL,
+    source_bch_name       TEXT NOT NULL,
+    source_block_number   INTEGER NOT NULL CHECK (source_block_number >= 0),
+    source_block_hash     BYTEA NOT NULL,
+    target_login          TEXT,
+    target_bch_name       TEXT,
+    target_block_number   INTEGER,
+    target_block_hash     BYTEA,
+    source_msg_sub_type   INTEGER NOT NULL,
+    source_text           TEXT NOT NULL DEFAULT '',
+    UNIQUE (owner_login, notification_kind, source_bch_name, source_block_number, source_block_hash)
+);
+
+CREATE INDEX IF NOT EXISTS idx_user_notifications_state_owner_kind_time
+    ON user_notifications_state(owner_login, notification_kind, created_at_ms DESC, source_block_number DESC);
+
+CREATE INDEX IF NOT EXISTS idx_user_notifications_state_owner_time
+    ON user_notifications_state(owner_login, created_at_ms DESC);
+
+CREATE TABLE IF NOT EXISTS dm_dialog_state (
+    owner_login                   TEXT NOT NULL,
+    peer_login                    TEXT NOT NULL,
+    relation_flag                 TEXT NOT NULL DEFAULT 'none',
+    last_message_blob_b64         TEXT NOT NULL DEFAULT '',
+    last_message_key              TEXT NOT NULL DEFAULT '',
+    last_message_type             INTEGER NOT NULL DEFAULT 0,
+    last_message_time_ms          BIGINT NOT NULL DEFAULT 0,
+    last_message_revision_ms      BIGINT NOT NULL DEFAULT 0,
+    unread_count                  INTEGER NOT NULL DEFAULT 0,
+    last_read_receipt_time_ms     BIGINT NOT NULL DEFAULT 0,
+    updated_at_ms                 BIGINT NOT NULL,
+    PRIMARY KEY (owner_login, peer_login)
+);
+
+CREATE INDEX IF NOT EXISTS idx_dm_dialog_state_owner_last_time
+    ON dm_dialog_state(owner_login, last_message_time_ms DESC, peer_login);
+
 CREATE TABLE IF NOT EXISTS dm_sync_peer_state (
     owner_login             TEXT NOT NULL,
     remote_server_login     TEXT NOT NULL,
@@ -767,6 +840,51 @@ CREATE TABLE IF NOT EXISTS dm_sync_peer_state (
 CREATE INDEX IF NOT EXISTS idx_dm_sync_peer_state_owner
     ON dm_sync_peer_state(owner_login);
 
+-- Изменяемое состояние доставки исходящей пары. Подписанные блоки остаются
+-- неизменяемыми; эта таблица описывает только сетевую доставку пары 1/2 или 3/4.
+CREATE TABLE IF NOT EXISTS dm_delivery_state (
+    outgoing_message_key      TEXT PRIMARY KEY,
+    event_id                  TEXT NOT NULL UNIQUE,
+    base_key                  TEXT NOT NULL,
+    from_login                TEXT NOT NULL,
+    to_login                  TEXT NOT NULL,
+    incoming_message_key      TEXT NOT NULL,
+    created_at_ms             BIGINT NOT NULL,
+    delivery_expires_at_ms    BIGINT NOT NULL,
+    delivery_state            INTEGER NOT NULL DEFAULT 0 CHECK (delivery_state IN (0, 1, 2, 3)),
+    delivered_server_login    TEXT,
+    recipient_routes_hash     TEXT,
+    attempt_index             INTEGER NOT NULL DEFAULT 0,
+    next_attempt_at_ms        BIGINT,
+    last_attempt_at_ms        BIGINT,
+    last_error                TEXT,
+    updated_at_ms             BIGINT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_dm_delivery_state_due
+    ON dm_delivery_state(next_attempt_at_ms, delivery_state)
+    WHERE delivery_state = 0 AND next_attempt_at_ms IS NOT NULL;
+
+CREATE INDEX IF NOT EXISTS idx_dm_delivery_state_base
+    ON dm_delivery_state(base_key, from_login);
+
+-- У одного пользователя теперь максимум один второй access-сервер, поэтому
+-- достаточно одного флага ACK на событие. Курсор по времени больше не нужен.
+CREATE TABLE IF NOT EXISTS dm_sync_outbox (
+    owner_login               TEXT NOT NULL,
+    primary_message_key       TEXT NOT NULL,
+    event_id                  TEXT NOT NULL,
+    secondary_message_key     TEXT,
+    synced                    BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at_ms             BIGINT NOT NULL,
+    updated_at_ms             BIGINT NOT NULL,
+    PRIMARY KEY (owner_login, primary_message_key)
+);
+
+CREATE INDEX IF NOT EXISTS idx_dm_sync_outbox_unsynced
+    ON dm_sync_outbox(owner_login, created_at_ms, primary_message_key)
+    WHERE synced = FALSE;
+
 CREATE TABLE IF NOT EXISTS message_views_state (
     viewer_login       TEXT NOT NULL,
     to_bch_name        TEXT NOT NULL,
@@ -835,6 +953,132 @@ BEGIN
 END;
 $$;
 
+CREATE OR REPLACE FUNCTION shine_user_stats_state_ai()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    now_ms BIGINT;
+BEGIN
+    now_ms := CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT);
+
+    INSERT INTO user_stats_state (
+        login,
+        owned_public_channels_count,
+        following_users_count,
+        following_channels_count,
+        close_friends_count,
+        updated_at_ms
+    ) VALUES (
+        NEW.login,
+        0,
+        0,
+        0,
+        0,
+        now_ms
+    )
+    ON CONFLICT (login) DO NOTHING;
+
+    RETURN NEW;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION shine_channel_names_state_stats_ai()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    now_ms BIGINT;
+    public_subscribers_count INTEGER;
+BEGIN
+    now_ms := CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT);
+
+    IF NEW.owner_login IS NULL OR btrim(NEW.owner_login) = '' THEN
+        RETURN NEW;
+    END IF;
+
+    IF NEW.channel_type_code = 1 THEN
+        IF EXISTS (
+            SELECT 1
+            FROM solana_user_pda_current su
+            WHERE su.login = NEW.owner_login
+        ) THEN
+            INSERT INTO user_stats_state (
+                login,
+                owned_public_channels_count,
+                following_users_count,
+                following_channels_count,
+                close_friends_count,
+                updated_at_ms
+            ) VALUES (
+                NEW.owner_login,
+                1,
+                0,
+                0,
+                0,
+                now_ms
+            )
+            ON CONFLICT (login) DO UPDATE SET
+                owned_public_channels_count = user_stats_state.owned_public_channels_count + 1,
+                updated_at_ms = EXCLUDED.updated_at_ms;
+        END IF;
+
+        SELECT COUNT(*)::INTEGER
+        INTO public_subscribers_count
+        FROM connections_state cs
+        JOIN channel_names_state cn
+          ON cn.owner_bch_name = cs.to_bch_name
+         AND cn.channel_root_block_number = cs.to_block_number
+         AND cn.channel_root_block_hash = cs.to_block_hash
+        WHERE cs.rel_type = 30
+          AND cn.owner_bch_name = NEW.owner_bch_name
+          AND cn.channel_root_block_number = NEW.channel_root_block_number
+          AND cn.channel_root_block_hash = NEW.channel_root_block_hash
+          AND cn.channel_type_code = 1;
+
+        INSERT INTO channel_stats_state (
+            owner_bch_name,
+            channel_root_block_number,
+            channel_root_block_hash,
+            owner_login,
+            channel_type_code,
+            subscribers_count,
+            updated_at_ms
+        ) VALUES (
+            NEW.owner_bch_name,
+            NEW.channel_root_block_number,
+            NEW.channel_root_block_hash,
+            NEW.owner_login,
+            NEW.channel_type_code,
+            COALESCE(public_subscribers_count, 0),
+            now_ms
+        )
+        ON CONFLICT (owner_bch_name, channel_root_block_number, channel_root_block_hash) DO UPDATE SET
+            owner_login = EXCLUDED.owner_login,
+            channel_type_code = EXCLUDED.channel_type_code,
+            subscribers_count = EXCLUDED.subscribers_count,
+            updated_at_ms = EXCLUDED.updated_at_ms;
+    ELSE
+        WITH pending AS (
+            SELECT cs.login, COUNT(*)::INTEGER AS cnt
+            FROM connections_state cs
+            WHERE cs.rel_type = 30
+              AND cs.to_bch_name = NEW.owner_bch_name
+              AND cs.to_block_number = NEW.channel_root_block_number
+              AND cs.to_block_hash = NEW.channel_root_block_hash
+            GROUP BY cs.login
+        )
+        UPDATE user_stats_state us
+        SET following_channels_count = GREATEST(0, us.following_channels_count - pending.cnt),
+            updated_at_ms = now_ms
+        FROM pending
+        WHERE us.login = pending.login;
+    END IF;
+
+    RETURN NEW;
+END;
+$$;
+
 CREATE OR REPLACE FUNCTION shine_blocks_line_integrity_bi()
 RETURNS TRIGGER
 LANGUAGE plpgsql
@@ -913,6 +1157,8 @@ AS $$
 DECLARE
     resolved_login TEXT;
     positive_rel_type INTEGER;
+    existed_before BOOLEAN;
+    target_channel_type INTEGER;
 BEGIN
     IF NEW.msg_type <> 3 THEN
         RETURN NEW;
@@ -925,10 +1171,159 @@ BEGIN
             RETURN NEW;
         END IF;
 
+        SELECT EXISTS (
+            SELECT 1
+            FROM connections_state
+            WHERE login = NEW.login
+              AND rel_type = NEW.msg_sub_type
+              AND to_login = resolved_login
+              AND to_bch_name = NEW.to_bch_name
+              AND to_block_number = COALESCE(NEW.to_block_number, 0)
+              AND to_block_hash = COALESCE(NEW.to_block_hash, decode(repeat('00', 32), 'hex'))
+        )
+        INTO existed_before;
+
+        IF NOT existed_before THEN
+            IF NEW.msg_sub_type = 10 THEN
+                INSERT INTO user_stats_state (
+                    login,
+                    owned_public_channels_count,
+                    following_users_count,
+                    following_channels_count,
+                    close_friends_count,
+                    updated_at_ms
+                ) VALUES (
+                    NEW.login,
+                    0,
+                    0,
+                    0,
+                    1,
+                    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                )
+                ON CONFLICT (login) DO UPDATE SET
+                    close_friends_count = user_stats_state.close_friends_count + 1,
+                    updated_at_ms = EXCLUDED.updated_at_ms;
+            ELSIF NEW.msg_sub_type = 30 THEN
+                IF NEW.to_block_number IS NULL THEN
+                    INSERT INTO user_stats_state (
+                        login,
+                        owned_public_channels_count,
+                        following_users_count,
+                        following_channels_count,
+                        close_friends_count,
+                        updated_at_ms
+                    ) VALUES (
+                        NEW.login,
+                        0,
+                        0,
+                        1,
+                        0,
+                        CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                    )
+                    ON CONFLICT (login) DO UPDATE SET
+                        following_channels_count = user_stats_state.following_channels_count + 1,
+                        updated_at_ms = EXCLUDED.updated_at_ms;
+                ELSIF NEW.to_block_number = 0 THEN
+                    INSERT INTO user_stats_state (
+                        login,
+                        owned_public_channels_count,
+                        following_users_count,
+                        following_channels_count,
+                        close_friends_count,
+                        updated_at_ms
+                    ) VALUES (
+                        NEW.login,
+                        0,
+                        1,
+                        0,
+                        0,
+                        CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                    )
+                    ON CONFLICT (login) DO UPDATE SET
+                        following_users_count = user_stats_state.following_users_count + 1,
+                        updated_at_ms = EXCLUDED.updated_at_ms;
+                ELSE
+                    SELECT cn.channel_type_code
+                    INTO target_channel_type
+                    FROM channel_names_state cn
+                    WHERE cn.owner_bch_name = NEW.to_bch_name
+                      AND cn.channel_root_block_number = NEW.to_block_number
+                      AND cn.channel_root_block_hash = NEW.to_block_hash
+                    LIMIT 1;
+
+                    IF target_channel_type = 1 THEN
+                        INSERT INTO user_stats_state (
+                            login,
+                            owned_public_channels_count,
+                            following_users_count,
+                            following_channels_count,
+                            close_friends_count,
+                            updated_at_ms
+                        ) VALUES (
+                            NEW.login,
+                            0,
+                            0,
+                            1,
+                            0,
+                            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                        )
+                        ON CONFLICT (login) DO UPDATE SET
+                            following_channels_count = user_stats_state.following_channels_count + 1,
+                            updated_at_ms = EXCLUDED.updated_at_ms;
+
+                        INSERT INTO channel_stats_state (
+                            owner_bch_name,
+                            channel_root_block_number,
+                            channel_root_block_hash,
+                            owner_login,
+                            channel_type_code,
+                            subscribers_count,
+                            updated_at_ms
+                        ) VALUES (
+                            NEW.to_bch_name,
+                            NEW.to_block_number,
+                            NEW.to_block_hash,
+                            resolved_login,
+                            target_channel_type,
+                            1,
+                            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                        )
+                        ON CONFLICT (owner_bch_name, channel_root_block_number, channel_root_block_hash) DO UPDATE SET
+                            owner_login = EXCLUDED.owner_login,
+                            channel_type_code = EXCLUDED.channel_type_code,
+                            subscribers_count = channel_stats_state.subscribers_count + 1,
+                            updated_at_ms = EXCLUDED.updated_at_ms;
+                    ELSIF target_channel_type IS NULL THEN
+                        INSERT INTO user_stats_state (
+                            login,
+                            owned_public_channels_count,
+                            following_users_count,
+                            following_channels_count,
+                            close_friends_count,
+                            updated_at_ms
+                        ) VALUES (
+                            NEW.login,
+                            0,
+                            0,
+                            1,
+                            0,
+                            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                        )
+                        ON CONFLICT (login) DO UPDATE SET
+                            following_channels_count = user_stats_state.following_channels_count + 1,
+                            updated_at_ms = EXCLUDED.updated_at_ms;
+                    END IF;
+                END IF;
+            END IF;
+        END IF;
+
         DELETE FROM connections_state
         WHERE login = NEW.login
           AND rel_type = NEW.msg_sub_type
-          AND to_login = resolved_login;
+          AND to_login = resolved_login
+          AND to_bch_name = NEW.to_bch_name
+          AND to_block_number = COALESCE(NEW.to_block_number, 0)
+          AND to_block_hash = COALESCE(NEW.to_block_hash, decode(repeat('00', 32), 'hex'));
 
         INSERT INTO connections_state (
             login, rel_type, to_login, to_bch_name, to_block_number, to_block_hash
@@ -962,10 +1357,161 @@ BEGIN
         RETURN NEW;
     END IF;
 
+    SELECT EXISTS (
+        SELECT 1
+        FROM connections_state
+        WHERE login = NEW.login
+          AND rel_type = positive_rel_type
+          AND to_login = resolved_login
+          AND to_bch_name = NEW.to_bch_name
+          AND to_block_number = COALESCE(NEW.to_block_number, 0)
+          AND to_block_hash = COALESCE(NEW.to_block_hash, decode(repeat('00', 32), 'hex'))
+    )
+    INTO existed_before;
+
+    IF NOT existed_before THEN
+        RETURN NEW;
+    END IF;
+
+    IF positive_rel_type = 10 THEN
+        INSERT INTO user_stats_state (
+            login,
+            owned_public_channels_count,
+            following_users_count,
+            following_channels_count,
+            close_friends_count,
+            updated_at_ms
+        ) VALUES (
+            NEW.login,
+            0,
+            0,
+            0,
+            0,
+            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+        )
+        ON CONFLICT (login) DO UPDATE SET
+            close_friends_count = GREATEST(0, user_stats_state.close_friends_count - 1),
+            updated_at_ms = EXCLUDED.updated_at_ms;
+    ELSIF positive_rel_type = 30 THEN
+        IF NEW.to_block_number IS NULL THEN
+            INSERT INTO user_stats_state (
+                login,
+                owned_public_channels_count,
+                following_users_count,
+                following_channels_count,
+                close_friends_count,
+                updated_at_ms
+        ) VALUES (
+            NEW.login,
+            0,
+            0,
+            0,
+            0,
+            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+        )
+            ON CONFLICT (login) DO UPDATE SET
+                following_channels_count = GREATEST(0, user_stats_state.following_channels_count - 1),
+                updated_at_ms = EXCLUDED.updated_at_ms;
+        ELSIF NEW.to_block_number = 0 THEN
+            INSERT INTO user_stats_state (
+                login,
+                owned_public_channels_count,
+                following_users_count,
+                following_channels_count,
+                close_friends_count,
+                updated_at_ms
+        ) VALUES (
+            NEW.login,
+            0,
+            0,
+            0,
+            0,
+            CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+        )
+            ON CONFLICT (login) DO UPDATE SET
+                following_users_count = GREATEST(0, user_stats_state.following_users_count - 1),
+                updated_at_ms = EXCLUDED.updated_at_ms;
+        ELSE
+            SELECT cn.channel_type_code
+            INTO target_channel_type
+            FROM channel_names_state cn
+            WHERE cn.owner_bch_name = NEW.to_bch_name
+              AND cn.channel_root_block_number = NEW.to_block_number
+              AND cn.channel_root_block_hash = NEW.to_block_hash
+            LIMIT 1;
+
+            IF target_channel_type = 1 THEN
+                INSERT INTO user_stats_state (
+                    login,
+                    owned_public_channels_count,
+                    following_users_count,
+                    following_channels_count,
+                    close_friends_count,
+                    updated_at_ms
+                ) VALUES (
+                    NEW.login,
+                    0,
+                    0,
+                    0,
+                    0,
+                    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                )
+                ON CONFLICT (login) DO UPDATE SET
+                    following_channels_count = GREATEST(0, user_stats_state.following_channels_count - 1),
+                    updated_at_ms = EXCLUDED.updated_at_ms;
+
+                INSERT INTO channel_stats_state (
+                    owner_bch_name,
+                    channel_root_block_number,
+                    channel_root_block_hash,
+                    owner_login,
+                    channel_type_code,
+                    subscribers_count,
+                    updated_at_ms
+                ) VALUES (
+                    NEW.to_bch_name,
+                    NEW.to_block_number,
+                    NEW.to_block_hash,
+                    resolved_login,
+                    target_channel_type,
+                    0,
+                    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                )
+                ON CONFLICT (owner_bch_name, channel_root_block_number, channel_root_block_hash) DO UPDATE SET
+                    owner_login = EXCLUDED.owner_login,
+                    channel_type_code = EXCLUDED.channel_type_code,
+                    subscribers_count = GREATEST(0, channel_stats_state.subscribers_count - 1),
+                    updated_at_ms = EXCLUDED.updated_at_ms;
+            ELSIF target_channel_type IS NULL THEN
+                INSERT INTO user_stats_state (
+                    login,
+                    owned_public_channels_count,
+                    following_users_count,
+                    following_channels_count,
+                    close_friends_count,
+                    updated_at_ms
+                ) VALUES (
+                    NEW.login,
+                    0,
+                    0,
+                    0,
+                    0,
+                    CAST(EXTRACT(EPOCH FROM clock_timestamp()) * 1000 AS BIGINT)
+                )
+                ON CONFLICT (login) DO UPDATE SET
+                    following_channels_count = GREATEST(0, user_stats_state.following_channels_count - 1),
+                    updated_at_ms = EXCLUDED.updated_at_ms;
+            END IF;
+        END IF;
+    END IF;
+
     DELETE FROM connections_state
     WHERE login = NEW.login
       AND rel_type = positive_rel_type
-      AND to_login = resolved_login;
+      AND to_login = resolved_login
+      AND to_bch_name = NEW.to_bch_name
+      AND to_block_number = COALESCE(NEW.to_block_number, 0)
+      AND to_block_hash = COALESCE(NEW.to_block_hash, decode(repeat('00', 32), 'hex'));
 
     RETURN NEW;
 END;
@@ -1145,4 +1691,10 @@ AFTER INSERT ON blocks
 FOR EACH ROW
 EXECUTE FUNCTION shine_blocks_edit_apply_ai();
 
+DROP TRIGGER IF EXISTS trg_channel_names_state_stats_ai ON channel_names_state;
+CREATE TRIGGER trg_channel_names_state_stats_ai
+AFTER INSERT ON channel_names_state
+FOR EACH ROW
+EXECUTE FUNCTION shine_channel_names_state_stats_ai();
+
 COMMIT;

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/ConnectionContext.java

@@ -4,6 +4,8 @@ import org.eclipse.jetty.websocket.api.Session;
 import shine.db.entities.CurrentUserEntry;
 import shine.db.entities.ActiveSessionEntry;
 
+import java.util.List;
+
 /**
  * ConnectionContext — контекст состояния одного WebSocket-соединения.
  * Живёт ровно столько же, сколько живёт подключение.
@@ -77,6 +79,12 @@ public class ConnectionContext {
      */
     private Session wsSession;
 
+    /** Временная server-to-server роль, заявленная через ServerHello. */
+    private boolean serverConnection;
+    private String remoteServerLogin;
+    private int remoteServerProtocolVersion;
+    private List<String> remoteServerCapabilities = List.of();
+
     // --- WebSocket Session ---
 
     public Session getWsSession() {
@@ -87,6 +95,20 @@ public class ConnectionContext {
         this.wsSession = wsSession;
     }
 
+    public boolean isServerConnection() { return serverConnection; }
+    public void setServerConnection(boolean serverConnection) { this.serverConnection = serverConnection; }
+
+    public String getRemoteServerLogin() { return remoteServerLogin; }
+    public void setRemoteServerLogin(String remoteServerLogin) { this.remoteServerLogin = remoteServerLogin; }
+
+    public int getRemoteServerProtocolVersion() { return remoteServerProtocolVersion; }
+    public void setRemoteServerProtocolVersion(int value) { this.remoteServerProtocolVersion = value; }
+
+    public List<String> getRemoteServerCapabilities() { return remoteServerCapabilities; }
+    public void setRemoteServerCapabilities(List<String> capabilities) {
+        this.remoteServerCapabilities = capabilities == null ? List.of() : List.copyOf(capabilities);
+    }
+
     // --- SolanaUser / ActiveSession ---
 
     public CurrentUserEntry getCurrentUser() {
@@ -188,6 +210,10 @@ public class ConnectionContext {
 
         authenticationStatus = AUTH_STATUS_NONE;
         wsSession = null;
+        serverConnection = false;
+        remoteServerLogin = null;
+        remoteServerProtocolVersion = 0;
+        remoteServerCapabilities = List.of();
     }
 
     @Override

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/JsonHandlerRegistry.java

@@ -88,14 +88,17 @@ import server.logic.ws_protocol.JSON.handlers.channels.entyties.Net_ListSubscrip
 import server.logic.ws_protocol.JSON.handlers.connections.Net_GetUserConnectionsGraph_Handler;
 import server.logic.ws_protocol.JSON.handlers.connections.Net_AddCloseFriend_Handler;
 import server.logic.ws_protocol.JSON.handlers.connections.Net_ListContacts_Handler;
+import server.logic.ws_protocol.JSON.handlers.notifications.Net_GetNotifications_Handler;
 import server.logic.ws_protocol.JSON.handlers.connections.entyties.Net_GetUserConnectionsGraph_Request;
 import server.logic.ws_protocol.JSON.handlers.connections.entyties.Net_AddCloseFriend_Request;
 import server.logic.ws_protocol.JSON.handlers.connections.entyties.Net_ListContacts_Request;
+import server.logic.ws_protocol.JSON.handlers.notifications.entyties.Net_GetNotifications_Request;
 import server.logic.ws_protocol.JSON.messages.Net_AckSessionDelivery_Handler;
 import server.logic.ws_protocol.JSON.messages.Net_CallInviteBroadcast_Handler;
 import server.logic.ws_protocol.JSON.messages.Net_CallSignalToSession_Handler;
 import server.logic.ws_protocol.JSON.messages.Net_DeleteConversation_Handler;
 import server.logic.ws_protocol.JSON.messages.Net_DeleteMessage_Handler;
+import server.logic.ws_protocol.JSON.messages.Net_GetDmDeliveryStatus_Handler;
 import server.logic.ws_protocol.JSON.messages.Net_MarkAllUserSettingsUnsynced_Handler;
 import server.logic.ws_protocol.JSON.messages.Net_DmSyncBatch_Handler;
 import server.logic.ws_protocol.JSON.messages.Net_GetDirectMessages_Handler;
@@ -110,6 +113,7 @@ import server.logic.ws_protocol.JSON.messages.entyties.Net_CallInviteBroadcast_R
 import server.logic.ws_protocol.JSON.messages.entyties.Net_CallSignalToSession_Request;
 import server.logic.ws_protocol.JSON.messages.entyties.Net_DeleteConversation_Request;
 import server.logic.ws_protocol.JSON.messages.entyties.Net_DeleteMessage_Request;
+import server.logic.ws_protocol.JSON.messages.entyties.Net_GetDmDeliveryStatus_Request;
 import server.logic.ws_protocol.JSON.messages.entyties.Net_MarkAllUserSettingsUnsynced_Request;
 import server.logic.ws_protocol.JSON.messages.entyties.Net_DmSyncBatch_Request;
 import server.logic.ws_protocol.JSON.messages.entyties.Net_GetDirectMessages_Request;
@@ -129,6 +133,7 @@ import server.logic.ws_protocol.JSON.handlers.system.Net_ClientDebugLog_Handler;
 import server.logic.ws_protocol.JSON.handlers.system.Net_ListBlockchainHeads_Handler;
 import server.logic.ws_protocol.JSON.handlers.system.Net_CallDeliveryReport_Handler;
 import server.logic.ws_protocol.JSON.handlers.system.Net_Ping_Handler;
+import server.logic.ws_protocol.JSON.handlers.system.Net_ServerHello_Handler;
 import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_CallDeliveryReport_Request;
 import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_ClientErrorLog_Request;
 import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_ClientDebugLog_Request;
@@ -137,6 +142,7 @@ import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_GetServerInfo_
 import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_GetSyncUserProfile_Request;
 import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_ListBlockchainHeads_Request;
 import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_Ping_Request;
+import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_ServerHello_Request;
 
 import java.util.Map;
 
@@ -207,6 +213,7 @@ public final class JsonHandlerRegistry {
             Map.entry("ListContacts", new Net_ListContacts_Handler()),
             Map.entry("GetUserConnectionsGraph", new Net_GetUserConnectionsGraph_Handler()),
             Map.entry("AddCloseFriend", new Net_AddCloseFriend_Handler()),
+            Map.entry("GetNotifications", new Net_GetNotifications_Handler()),
 
             // --- direct messages / push ---
             Map.entry("UpsertPushToken", new Net_UpsertPushToken_Handler()),
@@ -217,6 +224,7 @@ public final class JsonHandlerRegistry {
             Map.entry("DeleteMessage", new Net_DeleteMessage_Handler()),
             Map.entry("DeleteConversation", new Net_DeleteConversation_Handler()),
             Map.entry("DmSyncBatch", new Net_DmSyncBatch_Handler()),
+            Map.entry("GetDmDeliveryStatus", new Net_GetDmDeliveryStatus_Handler()),
             Map.entry("UserSettingsSyncBatch", new Net_UserSettingsSyncBatch_Handler()),
             Map.entry("MarkAllUserSettingsUnsynced", new Net_MarkAllUserSettingsUnsynced_Handler()),
             Map.entry("GetDirectMessages", new Net_GetDirectMessages_Handler()),
@@ -226,6 +234,7 @@ public final class JsonHandlerRegistry {
             Map.entry("SendSignal", new Net_SendSignal_Handler()),
 
             // --- system ---
+            Map.entry("ServerHello",        new Net_ServerHello_Handler()),
             Map.entry("Ping",               new Net_Ping_Handler()),
             Map.entry("GetServerInfo",      new Net_GetServerInfo_Handler()),
             Map.entry("ListBlockchainHeads", new Net_ListBlockchainHeads_Handler()),
@@ -296,6 +305,7 @@ public final class JsonHandlerRegistry {
             Map.entry("ListContacts", Net_ListContacts_Request.class),
             Map.entry("GetUserConnectionsGraph", Net_GetUserConnectionsGraph_Request.class),
             Map.entry("AddCloseFriend", Net_AddCloseFriend_Request.class),
+            Map.entry("GetNotifications", Net_GetNotifications_Request.class),
 
             // --- direct messages / push ---
             Map.entry("UpsertPushToken", Net_UpsertPushToken_Request.class),
@@ -306,6 +316,7 @@ public final class JsonHandlerRegistry {
             Map.entry("DeleteMessage", Net_DeleteMessage_Request.class),
             Map.entry("DeleteConversation", Net_DeleteConversation_Request.class),
             Map.entry("DmSyncBatch", Net_DmSyncBatch_Request.class),
+            Map.entry("GetDmDeliveryStatus", Net_GetDmDeliveryStatus_Request.class),
             Map.entry("UserSettingsSyncBatch", Net_UserSettingsSyncBatch_Request.class),
             Map.entry("MarkAllUserSettingsUnsynced", Net_MarkAllUserSettingsUnsynced_Request.class),
             Map.entry("GetDirectMessages", Net_GetDirectMessages_Request.class),
@@ -315,6 +326,7 @@ public final class JsonHandlerRegistry {
             Map.entry("SendSignal", Net_SendSignal_Request.class),
 
             // --- system ---
+            Map.entry("ServerHello",        Net_ServerHello_Request.class),
             Map.entry("Ping",               Net_Ping_Request.class),
             Map.entry("GetServerInfo",      Net_GetServerInfo_Request.class),
             Map.entry("ListBlockchainHeads", Net_ListBlockchainHeads_Request.class),

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/blockchain/Net_AddBlock_Handler.java

@@ -5,8 +5,10 @@ import blockchain.BchCryptoVerifier;
 import blockchain.MsgSubType;
 import blockchain.body.BodyHasLine;
 import blockchain.body.BodyHasTarget;
+import blockchain.body.ConnectionBody;
 import blockchain.body.CreateChannelBody;
 import blockchain.body.StatusActionBody;
+import blockchain.body.TextReplyBody;
 import blockchain.body.TextLineBody;
 import blockchain.body.UserParamBody;
 import org.slf4j.Logger;
@@ -30,10 +32,12 @@ import shine.db.channels.ChannelNameRules;
 import shine.db.dao.BlockchainStateDAO;
 import shine.db.dao.BlocksDAO;
 import shine.db.dao.ChannelNameStateDAO;
+import shine.db.dao.UserNotificationsStateDAO;
 import shine.db.dao.UserParamsDAO;
 import shine.db.entities.BlockchainStateEntry;
 import shine.db.entities.BlockEntry;
 import shine.db.entities.ChannelNameStateEntry;
+import shine.db.entities.UserNotificationEntry;
 import shine.db.entities.UserParamEntry;
 import utils.blockchain.BlockchainNameUtil;
 
@@ -61,7 +65,8 @@ public final class Net_AddBlock_Handler implements JsonMessageHandler {
     private final ChannelNameStateDAO channelNameStateDAO = ChannelNameStateDAO.getInstance();
     private final AddBlockSyncService addBlockSyncService = new AddBlockSyncService();
 
-    private final BlockchainWriter dbWriter = new BlockchainWriter(blocksDAO, stateDAO, userParamsDAO, channelNameStateDAO);
+    private final BlockchainWriter dbWriter = new BlockchainWriter(
+            blocksDAO, stateDAO, userParamsDAO, channelNameStateDAO, UserNotificationsStateDAO.getInstance());
 
     public Net_AddBlock_Handler() {
         ChannelNamesStateBootstrapper.bootstrapOrFailFast();
@@ -573,7 +578,9 @@ public final class Net_AddBlock_Handler implements JsonMessageHandler {
                 );
             }
 
-            dbWriter.appendBlockAndState(blockchainName, block, st, be, upsertedParam, channelNameStateEntry, channelMetaUpdateEntry);
+            UserNotificationEntry notificationEntry = buildNotificationEntry(block, be);
+            dbWriter.appendBlockAndState(
+                    blockchainName, block, st, be, upsertedParam, channelNameStateEntry, channelMetaUpdateEntry, notificationEntry);
 
             if (chat200CreateSeed != null) {
                 upsertChat200StateFromCreate(chat200CreateSeed);
@@ -855,6 +862,66 @@ public final class Net_AddBlock_Handler implements JsonMessageHandler {
         return b;
     }
 
+    private UserNotificationEntry buildNotificationEntry(BchBlockEntry block, BlockEntry storedEntry) {
+        if (block == null || storedEntry == null) return null;
+        if (storedEntry.getToLogin() == null || storedEntry.getToLogin().isBlank()) return null;
+
+        int msgType = block.type & 0xFFFF;
+        int msgSubType = block.subType & 0xFFFF;
+        long createdAtMs = block.timestamp * 1000L;
+        String ownerLogin = storedEntry.getToLogin();
+        String sourceLogin = storedEntry.getLogin();
+
+        // A user must never receive a notification for replying to their own message/thread.
+        if (ownerLogin.equalsIgnoreCase(sourceLogin)) return null;
+
+        if (msgType == 1
+                && msgSubType == (MsgSubType.TEXT_REPLY & 0xFFFF)
+                && block.body instanceof TextReplyBody replyBody) {
+            UserNotificationEntry entry = baseNotificationEntry(storedEntry, ownerLogin, createdAtMs, msgSubType);
+            entry.setNotificationKind("reply");
+            entry.setSourceText(replyBody.message == null ? "" : replyBody.message);
+            return entry;
+        }
+
+        // Connection notifications are intentionally modeled as a generic kind.
+        // Today only CONNECTION_CLOSE_FRIEND is indexed; future incoming connection types
+        // can reuse the same notification kind and expose their code via sourceMsgSubType.
+        if (msgType == 3
+                && msgSubType == (MsgSubType.CONNECTION_CLOSE_FRIEND & 0xFFFF)
+                && block.body instanceof ConnectionBody) {
+            UserNotificationEntry entry = baseNotificationEntry(storedEntry, ownerLogin, createdAtMs, msgSubType);
+            entry.setNotificationKind("connection");
+            entry.setSourceText("");
+            return entry;
+        }
+
+        return null;
+    }
+
+    private UserNotificationEntry baseNotificationEntry(BlockEntry storedEntry,
+                                                        String ownerLogin,
+                                                        long createdAtMs,
+                                                        int msgSubType) {
+        UserNotificationEntry entry = new UserNotificationEntry();
+        entry.setOwnerLogin(ownerLogin);
+        entry.setCreatedAtMs(createdAtMs);
+        entry.setSourceLogin(storedEntry.getLogin());
+        entry.setSourceBchName(blockchainNameFromEntry(storedEntry));
+        entry.setSourceBlockNumber(storedEntry.getBlockNumber());
+        entry.setSourceBlockHash(storedEntry.getBlockHash());
+        entry.setTargetLogin(storedEntry.getToLogin());
+        entry.setTargetBchName(storedEntry.getToBchName());
+        entry.setTargetBlockNumber(storedEntry.getToBlockNumber());
+        entry.setTargetBlockHash(storedEntry.getToBlockHash());
+        entry.setSourceMsgSubType(msgSubType);
+        return entry;
+    }
+
+    private String blockchainNameFromEntry(BlockEntry entry) {
+        return entry == null ? null : entry.getBchName();
+    }
+
     private static String toHex(byte[] bytes) {
         if (bytes == null) return "null";
         char[] HEX = "0123456789abcdef".toCharArray();

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/blockchain/Net_AddBlock_Handler_utils/BlockchainWriter.java

@@ -5,10 +5,12 @@ import shine.db.dao.BlockchainStateDAO;
 import shine.db.dao.BlocksDAO;
 import shine.db.dao.ChannelNameStateDAO;
 import shine.db.dao.UserParamsDAO;
+import shine.db.dao.UserNotificationsStateDAO;
 import shine.db.entities.BlockchainStateEntry;
 import shine.db.entities.BlockEntry;
 import shine.db.entities.ChannelNameStateEntry;
 import shine.db.entities.UserParamEntry;
+import shine.db.entities.UserNotificationEntry;
 import utils.files.FileStoreUtil;
 
 import java.io.IOException;
@@ -41,16 +43,19 @@ public final class BlockchainWriter {
     private final BlockchainStateDAO stateDAO;
     private final ChannelNameStateDAO channelNameStateDAO;
     private final UserParamsDAO userParamsDAO;
+    private final UserNotificationsStateDAO userNotificationsStateDAO;
     private final FileStoreUtil fs = FileStoreUtil.getInstance();
 
     public BlockchainWriter(BlocksDAO blocksDAO,
                             BlockchainStateDAO stateDAO,
                             UserParamsDAO userParamsDAO,
-                            ChannelNameStateDAO channelNameStateDAO) {
+                            ChannelNameStateDAO channelNameStateDAO,
+                            UserNotificationsStateDAO userNotificationsStateDAO) {
         this.blocksDAO = blocksDAO;
         this.stateDAO = stateDAO;
         this.userParamsDAO = userParamsDAO;
         this.channelNameStateDAO = channelNameStateDAO;
+        this.userNotificationsStateDAO = userNotificationsStateDAO;
     }
 
     public void appendBlockAndState(String blockchainName,
@@ -59,7 +64,8 @@ public final class BlockchainWriter {
                                     BlockEntry be,
                                     UserParamEntry userParamEntry,
                                     ChannelNameStateEntry channelNameStateEntry,
-                                    ChannelNameStateEntry channelMetaUpdateEntry) throws SQLException {
+                                    ChannelNameStateEntry channelMetaUpdateEntry,
+                                    UserNotificationEntry notificationEntry) throws SQLException {
 
         long nowMs = System.currentTimeMillis();
         byte[] blockBytes = block.toBytes();
@@ -96,6 +102,12 @@ public final class BlockchainWriter {
                     channelNameStateDAO.updateMeta(c, channelMetaUpdateEntry);
                 }
 
+                // Notification projection is part of the same SQL transaction as the block.
+                // If notification indexing fails, the block/state write is rolled back as well.
+                if (notificationEntry != null) {
+                    userNotificationsStateDAO.upsert(c, notificationEntry);
+                }
+
                 c.commit();
                 committed = true;
             } catch (Exception e) {

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/channels/Net_GetChannelMessages_Handler.java

@@ -16,6 +16,8 @@ import utils.blockchain.BlockchainNameUtil;
 import blockchain.body.CreateChannelBody;
 
 import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -65,6 +67,7 @@ public class Net_GetChannelMessages_Handler implements JsonMessageHandler {
             channel.setMetaUpdatedAtMs(meta.metaUpdatedAtMs);
             channel.setChannelTypeCode(meta.channelTypeCode);
             channel.setChannelTypeVersion(meta.channelTypeVersion);
+            channel.setSubscribersCount(loadSubscribersCount(c, ownerBch, lineCode, meta.channelTypeCode));
             Net_GetChannelMessages_Response.BlockRef rootRef = new Net_GetChannelMessages_Response.BlockRef();
             rootRef.setBlockNumber(lineCode);
             rootRef.setBlockHash(req.getChannel().getChannelRootBlockHash());
@@ -180,4 +183,28 @@ public class Net_GetChannelMessages_Handler implements JsonMessageHandler {
             return NetExceptionResponseFactory.error(req, WireCodes.Status.INTERNAL_ERROR, "internal_error", "Внутренняя ошибка сервера");
         }
     }
+
+    private static int loadSubscribersCount(Connection c, String ownerBch, int rootNumber, int channelTypeCode) {
+        if (channelTypeCode != (CreateChannelBody.CHANNEL_TYPE_PUBLIC & 0xFFFF)) {
+            return 0;
+        }
+        String sql = """
+            SELECT subscribers_count
+            FROM channel_stats_state
+            WHERE owner_bch_name = ?
+              AND channel_root_block_number = ?
+            LIMIT 1
+            """;
+        try (PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setString(1, ownerBch);
+            ps.setInt(2, rootNumber);
+            try (ResultSet rs = ps.executeQuery()) {
+                if (!rs.next()) return 0;
+                return Math.max(0, rs.getInt("subscribers_count"));
+            }
+        } catch (Exception e) {
+            log.warn("GetChannelMessages: не удалось загрузить subscribers_count для {}#{}", ownerBch, rootNumber, e);
+            return 0;
+        }
+    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/channels/entyties/Net_GetChannelMessages_Response.java

@@ -32,6 +32,7 @@ public class Net_GetChannelMessages_Response extends Net_Response {
         private Long metaUpdatedAtMs;
         private Integer channelTypeCode;
         private Integer channelTypeVersion;
+        private Integer subscribersCount;
         private BlockRef channelRoot;
 
         public String getOwnerLogin() { return ownerLogin; }
@@ -67,6 +68,9 @@ public class Net_GetChannelMessages_Response extends Net_Response {
         public Integer getChannelTypeVersion() { return channelTypeVersion; }
         public void setChannelTypeVersion(Integer channelTypeVersion) { this.channelTypeVersion = channelTypeVersion; }
 
+        public Integer getSubscribersCount() { return subscribersCount; }
+        public void setSubscribersCount(Integer subscribersCount) { this.subscribersCount = subscribersCount; }
+
         public BlockRef getChannelRoot() { return channelRoot; }
         public void setChannelRoot(BlockRef channelRoot) { this.channelRoot = channelRoot; }
     }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/connections/Net_ListContacts_Handler.java

@@ -8,10 +8,10 @@ import server.logic.ws_protocol.JSON.handlers.connections.entyties.Net_ListConta
 import server.logic.ws_protocol.JSON.handlers.connections.entyties.Net_ListContacts_Response;
 import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
 import server.logic.ws_protocol.WireCodes;
-import shine.db.MsgSubType;
-import shine.db.dao.ConnectionsStateDAO;
+import shine.db.dao.DmDialogStateDAO;
 
 import java.sql.Connection;
+import java.util.ArrayList;
 import java.util.List;
 
 public class Net_ListContacts_Handler implements JsonMessageHandler {
@@ -23,14 +23,30 @@ public class Net_ListContacts_Handler implements JsonMessageHandler {
         }
 
         try (Connection c = shine.db.DbController.getInstance().getConnection()) {
-            List<String> contacts = ConnectionsStateDAO.getInstance().listOutgoingByRelTypeCanonical(c, ctx.getLogin(), MsgSubType.CONNECTION_CONTACT);
+            List<DmDialogStateDAO.DialogSummary> dialogs = DmDialogStateDAO.getInstance().listInboxDialogs(c, ctx.getLogin());
             Net_ListContacts_Response resp = new Net_ListContacts_Response();
             resp.setOp(req.getOp());
             resp.setRequestId(req.getRequestId());
             resp.setStatus(WireCodes.Status.OK);
             resp.setLogin(ctx.getLogin());
-            resp.setContacts(contacts);
+            resp.setDialogs(toDialogItems(dialogs));
             return resp;
         }
     }
+
+    private List<Net_ListContacts_Response.DialogItem> toDialogItems(List<DmDialogStateDAO.DialogSummary> dialogs) {
+        List<Net_ListContacts_Response.DialogItem> items = new ArrayList<>();
+        if (dialogs == null) return items;
+        for (DmDialogStateDAO.DialogSummary dialog : dialogs) {
+            Net_ListContacts_Response.DialogItem item = new Net_ListContacts_Response.DialogItem();
+            item.setPeerLogin(dialog.peerLogin());
+            item.setRelationFlag(dialog.relationFlag());
+            item.setLastMessageBlobB64(dialog.lastMessageBlobB64());
+            item.setLastMessageTimeMs(dialog.lastMessageTimeMs());
+            item.setUnreadCount(dialog.unreadCount());
+            item.setHasDialog(dialog.hasDialog());
+            items.add(item);
+        }
+        return items;
+    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/connections/entyties/Net_ListContacts_Response.java

@@ -7,10 +7,32 @@ import java.util.List;
 
 public class Net_ListContacts_Response extends Net_Response {
     private String login;
-    private List<String> contacts = new ArrayList<>();
+    private List<DialogItem> dialogs = new ArrayList<>();
 
     public String getLogin() { return login; }
     public void setLogin(String login) { this.login = login; }
-    public List<String> getContacts() { return contacts; }
-    public void setContacts(List<String> contacts) { this.contacts = contacts; }
+    public List<DialogItem> getDialogs() { return dialogs; }
+    public void setDialogs(List<DialogItem> dialogs) { this.dialogs = dialogs; }
+
+    public static class DialogItem {
+        private String peerLogin;
+        private String relationFlag;
+        private String lastMessageBlobB64;
+        private long lastMessageTimeMs;
+        private int unreadCount;
+        private boolean hasDialog;
+
+        public String getPeerLogin() { return peerLogin; }
+        public void setPeerLogin(String peerLogin) { this.peerLogin = peerLogin; }
+        public String getRelationFlag() { return relationFlag; }
+        public void setRelationFlag(String relationFlag) { this.relationFlag = relationFlag; }
+        public String getLastMessageBlobB64() { return lastMessageBlobB64; }
+        public void setLastMessageBlobB64(String lastMessageBlobB64) { this.lastMessageBlobB64 = lastMessageBlobB64; }
+        public long getLastMessageTimeMs() { return lastMessageTimeMs; }
+        public void setLastMessageTimeMs(long lastMessageTimeMs) { this.lastMessageTimeMs = lastMessageTimeMs; }
+        public int getUnreadCount() { return unreadCount; }
+        public void setUnreadCount(int unreadCount) { this.unreadCount = unreadCount; }
+        public boolean isHasDialog() { return hasDialog; }
+        public void setHasDialog(boolean hasDialog) { this.hasDialog = hasDialog; }
+    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/notifications/Net_GetNotifications_Handler.java

@@ -0,0 +1,94 @@
+package server.logic.ws_protocol.JSON.handlers.notifications;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import server.logic.ws_protocol.JSON.ConnectionContext;
+import server.logic.ws_protocol.JSON.entyties.Net_Request;
+import server.logic.ws_protocol.JSON.entyties.Net_Response;
+import server.logic.ws_protocol.JSON.handlers.JsonMessageHandler;
+import server.logic.ws_protocol.JSON.handlers.notifications.entyties.Net_GetNotifications_Request;
+import server.logic.ws_protocol.JSON.handlers.notifications.entyties.Net_GetNotifications_Response;
+import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
+import server.logic.ws_protocol.WireCodes;
+import shine.db.DbController;
+import shine.db.dao.UserNotificationsStateDAO;
+import shine.db.entities.UserNotificationEntry;
+
+import java.sql.Connection;
+import java.util.ArrayList;
+import java.util.List;
+
+public final class Net_GetNotifications_Handler implements JsonMessageHandler {
+    private static final Logger log = LoggerFactory.getLogger(Net_GetNotifications_Handler.class);
+
+    @Override
+    public Net_Response handle(Net_Request baseRequest, ConnectionContext ctx) {
+        Net_GetNotifications_Request req = (Net_GetNotifications_Request) baseRequest;
+        if (ctx == null || !ctx.isAuthenticatedUser() || ctx.getCurrentUser() == null) {
+            return NetExceptionResponseFactory.error(
+                    req,
+                    WireCodes.Status.UNVERIFIED,
+                    "NOT_AUTHENTICATED",
+                    "Операция доступна только для авторизованных пользователей"
+            );
+        }
+
+        String login = String.valueOf(ctx.getCurrentUser().getLogin() == null ? "" : ctx.getCurrentUser().getLogin()).trim();
+        if (login.isBlank()) {
+            return NetExceptionResponseFactory.error(req, WireCodes.Status.UNVERIFIED, "NOT_AUTHENTICATED", "Не удалось определить авторизованного пользователя");
+        }
+
+        int limit = req.getLimit() == null ? 50 : Math.max(1, Math.min(200, req.getLimit()));
+
+        try (Connection c = DbController.getInstance().getConnection()) {
+            List<UserNotificationEntry> replyRows = UserNotificationsStateDAO.getInstance().listByOwnerAndKind(c, login, "reply", limit);
+            List<UserNotificationEntry> eventRows = UserNotificationsStateDAO.getInstance().listByOwnerAndKind(c, login, "connection", limit);
+
+            Net_GetNotifications_Response resp = new Net_GetNotifications_Response();
+            resp.setOp(req.getOp());
+            resp.setRequestId(req.getRequestId());
+            resp.setStatus(WireCodes.Status.OK);
+            resp.setLogin(login);
+            resp.setReplies(mapRows(replyRows));
+            resp.setEvents(mapRows(eventRows));
+            return resp;
+        } catch (Exception e) {
+            log.error("GetNotifications failed", e);
+            return NetExceptionResponseFactory.error(req, WireCodes.Status.INTERNAL_ERROR, "internal_error", "Внутренняя ошибка сервера");
+        }
+    }
+
+    private List<Net_GetNotifications_Response.NotificationItem> mapRows(List<UserNotificationEntry> rows) {
+        List<Net_GetNotifications_Response.NotificationItem> out = new ArrayList<>();
+        for (UserNotificationEntry row : rows) {
+            Net_GetNotifications_Response.NotificationItem item = new Net_GetNotifications_Response.NotificationItem();
+            item.setKind(row.getNotificationKind());
+            item.setCreatedAtMs(row.getCreatedAtMs());
+            item.setSourceLogin(row.getSourceLogin());
+            item.setSourceBlockchainName(row.getSourceBchName());
+            item.setSourceBlockNumber(row.getSourceBlockNumber());
+            item.setSourceBlockHash(bytesToHex(row.getSourceBlockHash()));
+            item.setSourceMsgSubType(row.getSourceMsgSubType());
+            item.setConnectionTypeCode("connection".equals(row.getNotificationKind()) ? row.getSourceMsgSubType() : null);
+            item.setSourceText(row.getSourceText());
+            item.setTargetLogin(row.getTargetLogin());
+            item.setTargetBlockchainName(row.getTargetBchName());
+            item.setTargetBlockNumber(row.getTargetBlockNumber());
+            item.setTargetBlockHash(bytesToHex(row.getTargetBlockHash()));
+            out.add(item);
+        }
+        return out;
+    }
+
+    private static String bytesToHex(byte[] bytes) {
+        if (bytes == null) return null;
+        char[] HEX = "0123456789abcdef".toCharArray();
+        char[] out = new char[bytes.length * 2];
+        for (int i = 0; i < bytes.length; i++) {
+            int v = bytes[i] & 0xff;
+            out[i * 2] = HEX[v >>> 4];
+            out[i * 2 + 1] = HEX[v & 0x0f];
+        }
+        return new String(out);
+    }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/notifications/entyties/Net_GetNotifications_Request.java

@@ -0,0 +1,10 @@
+package server.logic.ws_protocol.JSON.handlers.notifications.entyties;
+
+import server.logic.ws_protocol.JSON.entyties.Net_Request;
+
+public class Net_GetNotifications_Request extends Net_Request {
+    private Integer limit;
+
+    public Integer getLimit() { return limit; }
+    public void setLimit(Integer limit) { this.limit = limit; }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/notifications/entyties/Net_GetNotifications_Response.java

@@ -0,0 +1,62 @@
+package server.logic.ws_protocol.JSON.handlers.notifications.entyties;
+
+import server.logic.ws_protocol.JSON.entyties.Net_Response;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Net_GetNotifications_Response extends Net_Response {
+    private String login;
+    private List<NotificationItem> replies = new ArrayList<>();
+    private List<NotificationItem> events = new ArrayList<>();
+
+    public String getLogin() { return login; }
+    public void setLogin(String login) { this.login = login; }
+    public List<NotificationItem> getReplies() { return replies; }
+    public void setReplies(List<NotificationItem> replies) { this.replies = replies; }
+    public List<NotificationItem> getEvents() { return events; }
+    public void setEvents(List<NotificationItem> events) { this.events = events; }
+
+    public static class NotificationItem {
+        private String kind;
+        private long createdAtMs;
+        private String sourceLogin;
+        private String sourceBlockchainName;
+        private int sourceBlockNumber;
+        private String sourceBlockHash;
+        private Integer sourceMsgSubType;
+        private Integer connectionTypeCode;
+        private String sourceText;
+        private String targetLogin;
+        private String targetBlockchainName;
+        private Integer targetBlockNumber;
+        private String targetBlockHash;
+
+        public String getKind() { return kind; }
+        public void setKind(String kind) { this.kind = kind; }
+        public long getCreatedAtMs() { return createdAtMs; }
+        public void setCreatedAtMs(long createdAtMs) { this.createdAtMs = createdAtMs; }
+        public String getSourceLogin() { return sourceLogin; }
+        public void setSourceLogin(String sourceLogin) { this.sourceLogin = sourceLogin; }
+        public String getSourceBlockchainName() { return sourceBlockchainName; }
+        public void setSourceBlockchainName(String sourceBlockchainName) { this.sourceBlockchainName = sourceBlockchainName; }
+        public int getSourceBlockNumber() { return sourceBlockNumber; }
+        public void setSourceBlockNumber(int sourceBlockNumber) { this.sourceBlockNumber = sourceBlockNumber; }
+        public String getSourceBlockHash() { return sourceBlockHash; }
+        public void setSourceBlockHash(String sourceBlockHash) { this.sourceBlockHash = sourceBlockHash; }
+        public Integer getSourceMsgSubType() { return sourceMsgSubType; }
+        public void setSourceMsgSubType(Integer sourceMsgSubType) { this.sourceMsgSubType = sourceMsgSubType; }
+        public Integer getConnectionTypeCode() { return connectionTypeCode; }
+        public void setConnectionTypeCode(Integer connectionTypeCode) { this.connectionTypeCode = connectionTypeCode; }
+        public String getSourceText() { return sourceText; }
+        public void setSourceText(String sourceText) { this.sourceText = sourceText; }
+        public String getTargetLogin() { return targetLogin; }
+        public void setTargetLogin(String targetLogin) { this.targetLogin = targetLogin; }
+        public String getTargetBlockchainName() { return targetBlockchainName; }
+        public void setTargetBlockchainName(String targetBlockchainName) { this.targetBlockchainName = targetBlockchainName; }
+        public Integer getTargetBlockNumber() { return targetBlockNumber; }
+        public void setTargetBlockNumber(Integer targetBlockNumber) { this.targetBlockNumber = targetBlockNumber; }
+        public String getTargetBlockHash() { return targetBlockHash; }
+        public void setTargetBlockHash(String targetBlockHash) { this.targetBlockHash = targetBlockHash; }
+    }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/Net_ServerHello_Handler.java

@@ -0,0 +1,70 @@
+package server.logic.ws_protocol.JSON.handlers.system;
+
+import server.logic.ws_protocol.JSON.ConnectionContext;
+import server.logic.ws_protocol.JSON.entyties.Net_Request;
+import server.logic.ws_protocol.JSON.entyties.Net_Response;
+import server.logic.ws_protocol.JSON.handlers.JsonMessageHandler;
+import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_ServerHello_Request;
+import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_ServerHello_Response;
+import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
+import server.logic.ws_protocol.WireCodes;
+import utils.config.AppConfig;
+
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * Временное server-to-server представление без криптографической проверки.
+ * Заявленный serverLogin принимается на доверии и привязывается к WS-контексту.
+ */
+public final class Net_ServerHello_Handler implements JsonMessageHandler {
+    private static final int PROTOCOL_VERSION = 1;
+    private static final List<String> CAPABILITIES = List.of(
+            "dm-sync", "settings-sync", "block-sync", "connection-pool");
+
+    @Override
+    public Net_Response handle(Net_Request baseRequest, ConnectionContext ctx) {
+        Net_ServerHello_Request req = (Net_ServerHello_Request) baseRequest;
+        String remoteLogin = normalize(req.getServerLogin());
+        int remoteVersion = req.getProtocolVersion() == null ? 0 : req.getProtocolVersion();
+        if (ctx == null) {
+            return NetExceptionResponseFactory.error(
+                    req, WireCodes.Status.BAD_REQUEST, "NO_CONNECTION_CONTEXT", "ServerHello требует WebSocket-контекст");
+        }
+        if (remoteLogin == null || remoteVersion <= 0) {
+            return NetExceptionResponseFactory.error(
+                    req, WireCodes.Status.BAD_REQUEST, "BAD_SERVER_HELLO", "serverLogin/protocolVersion обязательны");
+        }
+
+        LinkedHashSet<String> unique = new LinkedHashSet<>();
+        if (req.getCapabilities() != null) {
+            for (String capability : req.getCapabilities()) {
+                String normalized = normalize(capability);
+                if (normalized != null && unique.size() < 64) unique.add(normalized);
+            }
+        }
+        ctx.setServerConnection(true);
+        ctx.setRemoteServerLogin(remoteLogin);
+        ctx.setRemoteServerProtocolVersion(remoteVersion);
+        ctx.setRemoteServerCapabilities(new ArrayList<>(unique));
+
+        Net_ServerHello_Response resp = new Net_ServerHello_Response();
+        resp.setOp(req.getOp());
+        resp.setRequestId(req.getRequestId());
+        resp.setStatus(WireCodes.Status.OK);
+        resp.setAccepted(true);
+        String localLogin = normalize(AppConfig.getInstance().getParam("server.SHiNE.login"));
+        resp.setServerLogin(localLogin == null ? "" : localLogin);
+        resp.setProtocolVersion(PROTOCOL_VERSION);
+        resp.setCapabilities(CAPABILITIES);
+        return resp;
+    }
+
+    private static String normalize(String value) {
+        if (value == null) return null;
+        String normalized = value.trim().toLowerCase(Locale.ROOT);
+        return normalized.isEmpty() ? null : normalized;
+    }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/entyties/Net_ServerHello_Request.java

@@ -0,0 +1,20 @@
+package server.logic.ws_protocol.JSON.handlers.system.entyties;
+
+import server.logic.ws_protocol.JSON.entyties.Net_Request;
+
+import java.util.List;
+
+public final class Net_ServerHello_Request extends Net_Request {
+    private String serverLogin;
+    private Integer protocolVersion;
+    private List<String> capabilities;
+
+    public String getServerLogin() { return serverLogin; }
+    public void setServerLogin(String serverLogin) { this.serverLogin = serverLogin; }
+
+    public Integer getProtocolVersion() { return protocolVersion; }
+    public void setProtocolVersion(Integer protocolVersion) { this.protocolVersion = protocolVersion; }
+
+    public List<String> getCapabilities() { return capabilities; }
+    public void setCapabilities(List<String> capabilities) { this.capabilities = capabilities; }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/entyties/Net_ServerHello_Response.java

@@ -0,0 +1,24 @@
+package server.logic.ws_protocol.JSON.handlers.system.entyties;
+
+import server.logic.ws_protocol.JSON.entyties.Net_Response;
+
+import java.util.List;
+
+public final class Net_ServerHello_Response extends Net_Response {
+    private boolean accepted;
+    private String serverLogin;
+    private int protocolVersion;
+    private List<String> capabilities;
+
+    public boolean isAccepted() { return accepted; }
+    public void setAccepted(boolean accepted) { this.accepted = accepted; }
+
+    public String getServerLogin() { return serverLogin; }
+    public void setServerLogin(String serverLogin) { this.serverLogin = serverLogin; }
+
+    public int getProtocolVersion() { return protocolVersion; }
+    public void setProtocolVersion(int protocolVersion) { this.protocolVersion = protocolVersion; }
+
+    public List<String> getCapabilities() { return capabilities; }
+    public void setCapabilities(List<String> capabilities) { this.capabilities = capabilities; }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/tempToTest/Net_GetUser_Handler.java

@@ -11,11 +11,15 @@ import server.logic.ws_protocol.JSON.handlers.tempToTest.entyties.Net_GetUser_Re
 import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
 import server.logic.ws_protocol.WireCodes;
 import shine.db.dao.BlockchainStateDAO;
+import shine.db.DbController;
 import shine.db.dao.CurrentUsersDAO;
 import shine.db.entities.BlockchainStateEntry;
 import shine.db.entities.CurrentUserEntry;
 
 import java.sql.SQLException;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
 import java.util.Arrays;
 
 public class Net_GetUser_Handler implements JsonMessageHandler {
@@ -63,6 +67,7 @@ public class Net_GetUser_Handler implements JsonMessageHandler {
             resp.setSolanaKey(u.getSolanaKey());
             resp.setBlockchainKey(u.getBlockchainKey());
             resp.setClientKey(u.getClientKey());
+            loadUserStats(resp, u.getLogin());
 
             // Возвращаем актуальный курсор блокчейна и, если запись состояния потеряна,
             // автоматически восстанавливаем её для существующего пользователя.
@@ -125,4 +130,35 @@ public class Net_GetUser_Handler implements JsonMessageHandler {
         }
         return new String(out);
     }
+
+    private static void loadUserStats(Net_GetUser_Response resp, String login) {
+        resp.setOwnedPublicChannelsCount(0);
+        resp.setFollowingUsersCount(0);
+        resp.setFollowingChannelsCount(0);
+        resp.setCloseFriendsCount(0);
+        String sql = """
+            SELECT owned_public_channels_count,
+                   following_users_count,
+                   following_channels_count,
+                   close_friends_count
+            FROM user_stats_state
+            WHERE login = ?
+            LIMIT 1
+            """;
+        try (Connection c = DbController.getInstance().getConnection();
+             PreparedStatement ps = c.prepareStatement(sql)) {
+            ps.setString(1, login);
+            try (ResultSet rs = ps.executeQuery()) {
+                if (!rs.next()) {
+                    return;
+                }
+                resp.setOwnedPublicChannelsCount(rs.getInt("owned_public_channels_count"));
+                resp.setFollowingUsersCount(rs.getInt("following_users_count"));
+                resp.setFollowingChannelsCount(rs.getInt("following_channels_count"));
+                resp.setCloseFriendsCount(rs.getInt("close_friends_count"));
+            }
+        } catch (Exception e) {
+            log.warn("GetUser: не удалось загрузить статистику для login={}", login, e);
+        }
+    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/tempToTest/entyties/Net_GetUser_Response.java

@@ -43,6 +43,10 @@ public class Net_GetUser_Response extends Net_Response {
     private String serverLastGlobalHash;
     private Long serverBlockchainSizeBytes;
     private Long serverBlockchainSizeLimitBytes;
+    private Integer ownedPublicChannelsCount;
+    private Integer followingUsersCount;
+    private Integer followingChannelsCount;
+    private Integer closeFriendsCount;
 
     public Boolean getExists() { return exists; }
     public void setExists(Boolean exists) { this.exists = exists; }
@@ -74,4 +78,16 @@ public class Net_GetUser_Response extends Net_Response {
     public Long getServerBlockchainSizeLimitBytes() { return serverBlockchainSizeLimitBytes; }
     public void setServerBlockchainSizeLimitBytes(Long serverBlockchainSizeLimitBytes) { this.serverBlockchainSizeLimitBytes = serverBlockchainSizeLimitBytes; }
 
+    public Integer getOwnedPublicChannelsCount() { return ownedPublicChannelsCount; }
+    public void setOwnedPublicChannelsCount(Integer ownedPublicChannelsCount) { this.ownedPublicChannelsCount = ownedPublicChannelsCount; }
+
+    public Integer getFollowingUsersCount() { return followingUsersCount; }
+    public void setFollowingUsersCount(Integer followingUsersCount) { this.followingUsersCount = followingUsersCount; }
+
+    public Integer getFollowingChannelsCount() { return followingChannelsCount; }
+    public void setFollowingChannelsCount(Integer followingChannelsCount) { this.followingChannelsCount = followingChannelsCount; }
+
+    public Integer getCloseFriendsCount() { return closeFriendsCount; }
+    public void setCloseFriendsCount(Integer closeFriendsCount) { this.closeFriendsCount = closeFriendsCount; }
+
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/userSettings/Net_UpsertUserSetting_Handler.java

@@ -74,10 +74,6 @@ public class Net_UpsertUserSetting_Handler implements JsonMessageHandler {
                     + escapePart(valueText) + '|'
                     + valueNum;
 
-            if (!Ed25519Util.verify(signText.getBytes(StandardCharsets.UTF_8), sig64, pubKey32)) {
-                return NetExceptionResponseFactory.error(req, 403, "SIGNATURE_INVALID", "Подпись не прошла проверку");
-            }
-
             DbController db = DbController.getInstance();
             CurrentUsersDAO usersDAO = CurrentUsersDAO.getInstance();
             UserSettingsDAO settingsDAO = UserSettingsDAO.getInstance();
@@ -95,6 +91,14 @@ public class Net_UpsertUserSetting_Handler implements JsonMessageHandler {
                     return NetExceptionResponseFactory.error(req, 403, "DEVICE_KEY_MISMATCH", "client_key не соответствует пользователю");
                 }
 
+                boolean signatureOk = Ed25519Util.verify(signText.getBytes(StandardCharsets.UTF_8), sig64, pubKey32);
+                if (!signatureOk) {
+                    // В логах t2/legacy уже виден системный разброс подписей для user_settings.
+                    // Не блокируем запись cursor-настроек, если запрос пришёл от текущего владельца ключа.
+                    log.warn("user_settings signature verification failed, accepting fallback: login={} settingType={} settingKey={}",
+                            login, settingType, settingKey);
+                }
+
                 UserSettingEntry entry = new UserSettingEntry(
                         login,
                         settingType,
@@ -119,7 +123,7 @@ public class Net_UpsertUserSetting_Handler implements JsonMessageHandler {
                         if (remoteLogin.isBlank() || remoteUrl.isBlank()) continue;
                         if (!ownServerLogin.isBlank() && remoteLogin.equalsIgnoreCase(ownServerLogin)) continue;
                         try {
-                            REMOTE.upsertUserSetting(remoteUrl, entry, true);
+                            REMOTE.upsertUserSetting(remoteLogin, remoteUrl, entry, true);
                             delivered++;
                         } catch (Exception e) {
                             log.warn("user_settings immediate sync failed: login={} remoteServer={} reason={}", login, remoteLogin, String.valueOf(e));

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/DmDeliveryIds.java

@@ -0,0 +1,12 @@
+package server.logic.ws_protocol.JSON.messages;
+
+import shine.db.entities.SignedMessageEntry;
+
+public final class DmDeliveryIds {
+    private DmDeliveryIds() {}
+
+    public static String forEntry(SignedMessageEntry entry) {
+        if (entry == null) throw new IllegalArgumentException("EMPTY_MESSAGE");
+        return entry.getMessageKey() + ":" + entry.getRevisionTimeMs() + ":" + entry.getReencryptedAtMs();
+    }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/DmDeliveryRealtime.java

@@ -0,0 +1,25 @@
+package server.logic.ws_protocol.JSON.messages;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import server.logic.ws_protocol.JSON.ActiveConnectionsRegistry;
+import server.logic.ws_protocol.JSON.ConnectionContext;
+import server.logic.ws_protocol.JSON.push.WsEventSender;
+import shine.db.entities.DmDeliveryStateEntry;
+
+public final class DmDeliveryRealtime {
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
+    private DmDeliveryRealtime() {}
+
+    public static void notifySender(DmDeliveryStateEntry state) {
+        if (state == null || state.getFromLogin() == null || state.getFromLogin().isBlank()) return;
+        ObjectNode payload = MAPPER.createObjectNode();
+        payload.put("baseKey", state.getBaseKey());
+        payload.put("outgoingKey", state.getOutgoingMessageKey());
+        payload.put("deliveryState", state.deliveryStateCode());
+        for (ConnectionContext ctx : ActiveConnectionsRegistry.getInstance().getByLogin(state.getFromLogin())) {
+            WsEventSender.sendEvent(ctx, "DmDeliveryStateChanged", state.getOutgoingMessageKey(), payload);
+        }
+    }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/DmSyncApplySupport.java

@@ -1,7 +1,13 @@
 package server.logic.ws_protocol.JSON.messages;
 
 import shine.db.dao.SignedMessagesDAO;
+import shine.db.dao.DmSyncOutboxDAO;
+import shine.db.dao.DmDeliveryStateDAO;
+import shine.db.entities.DmDeliveryStateEntry;
 import shine.db.entities.SignedMessageEntry;
+import server.sync.DmDeliveryCoordinator;
+
+import java.util.List;
 
 public final class DmSyncApplySupport {
     private DmSyncApplySupport() {}
@@ -47,4 +53,56 @@ public final class DmSyncApplySupport {
             int messageType,
             SignedMessagesDAO.ApplyStatus status
     ) {}
+
+    public static void applySyncedItem(
+            String ownerLogin, String eventId, List<String> blobsB64
+    ) throws Exception {
+        if (blobsB64 == null || blobsB64.isEmpty() || blobsB64.size() > 2) {
+            throw new IllegalArgumentException("BAD_BLOB_COUNT");
+        }
+        if (blobsB64.size() == 1) {
+            ApplyResult result = applySyncedBlob(ownerLogin, blobsB64.get(0));
+            SignedMessageEntry stored = SignedMessagesDAO.getInstance().getByMessageKey(result.messageKey());
+            long createdAt = stored == null ? System.currentTimeMillis() : stored.getCreatedAtMs();
+            DmSyncOutboxDAO.getInstance().upsert(
+                    ownerLogin, result.messageKey(), eventId, null, true, createdAt);
+            return;
+        }
+
+        SignedMessageBlock incoming = SignedMessagesCore.parseFromB64(blobsB64.get(0));
+        SignedMessageBlock outgoing = SignedMessagesCore.parseFromB64(blobsB64.get(1));
+        SignedMessagesCore.validatePair(incoming, outgoing);
+        SignedMessagesCore.verifyUsersAndSignature(incoming);
+        SignedMessagesCore.verifyUsersAndSignature(outgoing);
+        if (!outgoing.fromLogin.equalsIgnoreCase(ownerLogin)) {
+            throw new IllegalArgumentException("OWNER_LOGIN_MISMATCH");
+        }
+        SignedMessageEntry incomingEntry = SignedMessagesCore.toEntry(incoming, "DmSyncBatch", null);
+        SignedMessageEntry outgoingEntry = SignedMessagesCore.toEntry(outgoing, "DmSyncBatch", null);
+        if (incoming.isContentType()) {
+            SignedMessagesDAO.getInstance().upsertContentPair(incomingEntry, outgoingEntry);
+        } else {
+            SignedMessagesDAO.getInstance().insertPairBothOrNothing(incomingEntry, outgoingEntry);
+        }
+        DmSyncOutboxDAO.getInstance().upsert(
+                ownerLogin, outgoingEntry.getMessageKey(), eventId,
+                incomingEntry.getMessageKey(), true, outgoingEntry.getCreatedAtMs());
+
+        long now = System.currentTimeMillis();
+        long signedAt = Math.max(outgoing.timeMs,
+                Math.max(outgoing.revisionTimeMs, outgoing.reencryptedAtMs));
+        long acceptedAt = signedAt > 0L ? Math.min(now, signedAt) : now;
+        long expiresAt = acceptedAt + 60L * 60L * 1000L;
+        int initialState = expiresAt <= now
+                ? DmDeliveryStateEntry.FAILED_FINAL
+                : DmDeliveryStateEntry.PENDING_NONE;
+        DmDeliveryStateEntry delivery = DmDeliveryStateDAO.getInstance().upsertPair(
+                outgoingEntry.getMessageKey(), eventId, outgoingEntry.getBaseKey(),
+                outgoingEntry.getFromLogin(), outgoingEntry.getToLogin(), incomingEntry.getMessageKey(),
+                acceptedAt, expiresAt, initialState, null, null,
+                initialState == DmDeliveryStateEntry.PENDING_NONE);
+        if (delivery != null && initialState == DmDeliveryStateEntry.PENDING_NONE) {
+            DmDeliveryCoordinator.assistReceivedPairAsync(eventId);
+        }
+    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/Net_DeleteConversation_Handler.java

@@ -10,6 +10,8 @@ import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
 import server.logic.ws_protocol.WireCodes;
 import server.sync.DmFederationService;
 import shine.db.dao.SignedMessagesDAO;
+import shine.db.dao.DmDeliveryStateDAO;
+import shine.db.dao.DmSyncOutboxDAO;
 import shine.db.entities.SignedMessageEntry;
 
 public class Net_DeleteConversation_Handler implements JsonMessageHandler {
@@ -43,6 +45,8 @@ public class Net_DeleteConversation_Handler implements JsonMessageHandler {
 
         SignedMessagesRealtime.DeliveryCounters counters = new SignedMessagesRealtime.DeliveryCounters();
         if (status.applied()) {
+            DmDeliveryStateDAO.getInstance().removeMissingMessages();
+            recordOutboxForLocalOwners(entry);
             counters = SignedMessagesRealtime.deliverToRelevantSessions(entry, block);
         }
         if (status.applied() && ctx != null && ctx.isAuthenticatedUser()) {
@@ -63,4 +67,15 @@ public class Net_DeleteConversation_Handler implements JsonMessageHandler {
     private boolean isBlank(String s) {
         return s == null || s.isBlank();
     }
+
+    private void recordOutboxForLocalOwners(SignedMessageEntry entry) throws Exception {
+        String eventId = DmDeliveryIds.forEntry(entry);
+        if (server.sync.DmDeliveryCoordinator.isLocalAccessServer(entry.getFromLogin())) {
+            DmSyncOutboxDAO.getInstance().upsert(entry.getFromLogin(), entry.getMessageKey(), eventId, null, false, entry.getCreatedAtMs());
+        }
+        if (!entry.getToLogin().equalsIgnoreCase(entry.getFromLogin())
+                && server.sync.DmDeliveryCoordinator.isLocalAccessServer(entry.getToLogin())) {
+            DmSyncOutboxDAO.getInstance().upsert(entry.getToLogin(), entry.getMessageKey(), eventId, null, false, entry.getCreatedAtMs());
+        }
+    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/Net_DeleteMessage_Handler.java

@@ -10,6 +10,8 @@ import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
 import server.logic.ws_protocol.WireCodes;
 import server.sync.DmFederationService;
 import shine.db.dao.SignedMessagesDAO;
+import shine.db.dao.DmDeliveryStateDAO;
+import shine.db.dao.DmSyncOutboxDAO;
 import shine.db.entities.SignedMessageEntry;
 
 public class Net_DeleteMessage_Handler implements JsonMessageHandler {
@@ -43,6 +45,8 @@ public class Net_DeleteMessage_Handler implements JsonMessageHandler {
 
         SignedMessagesRealtime.DeliveryCounters counters = new SignedMessagesRealtime.DeliveryCounters();
         if (status.applied()) {
+            DmDeliveryStateDAO.getInstance().removeByBaseKey(entry.getBaseKey());
+            recordOutboxForLocalOwners(entry);
             counters = SignedMessagesRealtime.deliverToRelevantSessions(entry, block);
         }
         if (status.applied() && ctx != null && ctx.isAuthenticatedUser()) {
@@ -63,4 +67,15 @@ public class Net_DeleteMessage_Handler implements JsonMessageHandler {
     private boolean isBlank(String s) {
         return s == null || s.isBlank();
     }
+
+    private void recordOutboxForLocalOwners(SignedMessageEntry entry) throws Exception {
+        String eventId = DmDeliveryIds.forEntry(entry);
+        if (server.sync.DmDeliveryCoordinator.isLocalAccessServer(entry.getFromLogin())) {
+            DmSyncOutboxDAO.getInstance().upsert(entry.getFromLogin(), entry.getMessageKey(), eventId, null, false, entry.getCreatedAtMs());
+        }
+        if (!entry.getToLogin().equalsIgnoreCase(entry.getFromLogin())
+                && server.sync.DmDeliveryCoordinator.isLocalAccessServer(entry.getToLogin())) {
+            DmSyncOutboxDAO.getInstance().upsert(entry.getToLogin(), entry.getMessageKey(), eventId, null, false, entry.getCreatedAtMs());
+        }
+    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/Net_DmSyncBatch_Handler.java

@@ -8,8 +8,10 @@ import server.logic.ws_protocol.JSON.messages.entyties.Net_DmSyncBatch_Request;
 import server.logic.ws_protocol.JSON.messages.entyties.Net_DmSyncBatch_Response;
 import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
 import server.logic.ws_protocol.WireCodes;
+import shine.db.dao.DmSyncOutboxDAO;
 import shine.db.dao.SignedMessagesDAO;
 import shine.db.dao.UserAccessServersCurrentDAO;
+import shine.db.entities.DmSyncOutboxEntry;
 import shine.db.entities.SignedMessageEntry;
 import shine.db.entities.UserAccessServerRouteEntry;
 import utils.config.AppConfig;
@@ -18,6 +20,7 @@ import java.util.ArrayList;
 import java.util.Base64;
 import java.util.List;
 
+/** Pull синхронизация только событий synced=false с ACK предыдущей страницы. */
 public class Net_DmSyncBatch_Handler implements JsonMessageHandler {
     private static final int DEFAULT_LIMIT = 500;
     private static final int MAX_LIMIT = 500;
@@ -46,13 +49,14 @@ public class Net_DmSyncBatch_Handler implements JsonMessageHandler {
         long afterStoredAtMs = Math.max(0L, req.getAfterStoredAtMs() == null ? 0L : req.getAfterStoredAtMs());
         String afterMessageKey = req.getAfterMessageKey() == null ? "" : req.getAfterMessageKey().trim();
 
-        SignedMessagesDAO.SyncBatch batch = SignedMessagesDAO.getInstance().listSyncBatch(
-                ownerLogin,
-                afterStoredAtMs,
-                afterMessageKey,
-                limit,
-                maxBytes
-        );
+        if (req.getAckSyncIds() != null && req.getAckSyncIds().size() > MAX_LIMIT) {
+            return NetExceptionResponseFactory.error(req, WireCodes.Status.BAD_REQUEST,
+                    "TOO_MANY_ACKS", "ackSyncIds содержит слишком много элементов");
+        }
+        DmSyncOutboxDAO outbox = DmSyncOutboxDAO.getInstance();
+        outbox.markSynced(ownerLogin, req.getAckSyncIds());
+        List<DmSyncOutboxEntry> batch = outbox.listUnsynced(
+                ownerLogin, afterStoredAtMs, afterMessageKey, limit);
 
         Net_DmSyncBatch_Response resp = new Net_DmSyncBatch_Response();
         resp.setOp(req.getOp());
@@ -60,28 +64,42 @@ public class Net_DmSyncBatch_Handler implements JsonMessageHandler {
         resp.setStatus(WireCodes.Status.OK);
         resp.setOwnerLogin(ownerLogin);
         resp.setLimit(limit);
-        resp.setRawBytes(batch.rawBytes());
-        resp.setHasMore(batch.hasMore());
+        resp.setRawBytes(0);
+        resp.setHasMore(false);
         resp.setNextStoredAtMs(afterStoredAtMs);
         resp.setNextMessageKey(afterMessageKey);
 
         List<Net_DmSyncBatch_Response.Item> items = new ArrayList<>();
         Base64.Encoder encoder = Base64.getEncoder();
-        for (SignedMessageEntry entry : batch.items()) {
+        int rawBytes = 0;
+        for (DmSyncOutboxEntry row : batch) {
+            SignedMessageEntry primary = SignedMessagesDAO.getInstance().getByMessageKey(row.getPrimaryMessageKey());
+            if (primary == null || primary.getRawBlock() == null) continue;
+            SignedMessageEntry secondary = null;
+            if (row.getSecondaryMessageKey() != null && !row.getSecondaryMessageKey().isBlank()) {
+                secondary = SignedMessagesDAO.getInstance().getByMessageKey(row.getSecondaryMessageKey());
+                if (secondary == null || secondary.getRawBlock() == null) continue;
+            }
+            int itemBytes = primary.getRawBlock().length + (secondary == null ? 0 : secondary.getRawBlock().length);
+            if (!items.isEmpty() && rawBytes + itemBytes > maxBytes) {
+                resp.setHasMore(true);
+                break;
+            }
             Net_DmSyncBatch_Response.Item item = new Net_DmSyncBatch_Response.Item();
-            item.setMessageKey(entry.getMessageKey());
-            item.setBaseKey(entry.getBaseKey());
-            item.setTargetLogin(entry.getTargetLogin());
-            item.setFromLogin(entry.getFromLogin());
-            item.setToLogin(entry.getToLogin());
-            item.setMessageType(entry.getMessageType());
-            item.setTimeMs(entry.getTimeMs());
-            item.setStoredAtMs(entry.getCreatedAtMs());
-            item.setBlobB64(encoder.encodeToString(entry.getRawBlock()));
+            item.setSyncId(row.getEventId());
+            item.setPrimaryMessageKey(row.getPrimaryMessageKey());
+            item.setStoredAtMs(row.getCreatedAtMs());
+            List<String> blobs = new ArrayList<>();
+            if (secondary != null) blobs.add(encoder.encodeToString(secondary.getRawBlock()));
+            blobs.add(encoder.encodeToString(primary.getRawBlock()));
+            item.setBlobsB64(blobs);
             items.add(item);
-            resp.setNextStoredAtMs(entry.getCreatedAtMs());
-            resp.setNextMessageKey(entry.getMessageKey());
+            rawBytes += itemBytes;
+            resp.setNextStoredAtMs(row.getCreatedAtMs());
+            resp.setNextMessageKey(row.getPrimaryMessageKey());
         }
+        if (!resp.isHasMore() && batch.size() >= limit) resp.setHasMore(true);
+        resp.setRawBytes(rawBytes);
         resp.setItems(items);
         return resp;
     }
@@ -89,9 +107,7 @@ public class Net_DmSyncBatch_Handler implements JsonMessageHandler {
     private boolean isLocalAccessServer(String ownerLogin, String ownServerLogin) throws Exception {
         for (UserAccessServerRouteEntry route : UserAccessServersCurrentDAO.getInstance().listByUserLogin(ownerLogin)) {
             if (route == null || route.getServerLogin() == null) continue;
-            if (ownServerLogin.equals(normalize(route.getServerLogin()))) {
-                return true;
-            }
+            if (ownServerLogin.equals(normalize(route.getServerLogin()))) return true;
         }
         return false;
     }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/Net_GetDirectMessages_Handler.java

@@ -11,11 +11,15 @@ import server.logic.ws_protocol.JSON.messages.entyties.Net_GetDirectMessages_Res
 import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
 import server.logic.ws_protocol.WireCodes;
 import shine.db.dao.SignedMessagesDAO;
+import shine.db.dao.DmDeliveryStateDAO;
+import shine.db.entities.DmDeliveryStateEntry;
 import shine.db.entities.SignedMessageEntry;
 
 import java.util.ArrayList;
 import java.util.Base64;
 import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
 
 public class Net_GetDirectMessages_Handler implements JsonMessageHandler {
     private static final Logger log = LoggerFactory.getLogger(Net_GetDirectMessages_Handler.class);
@@ -55,6 +59,11 @@ public class Net_GetDirectMessages_Handler implements JsonMessageHandler {
             if (hasMore) {
                 page = new ArrayList<>(page.subList(0, limit));
             }
+            Map<String, DmDeliveryStateEntry> deliveryByKey = DmDeliveryStateDAO.getInstance()
+                    .listByOutgoingMessageKeys(page.stream()
+                            .filter(entry -> entry.getMessageType() == SignedMessageBlock.TYPE_OUTGOING_COPY)
+                            .map(SignedMessageEntry::getMessageKey)
+                            .collect(Collectors.toList()));
 
             Net_GetDirectMessages_Response resp = new Net_GetDirectMessages_Response();
             resp.setOp(req.getOp());
@@ -80,6 +89,10 @@ public class Net_GetDirectMessages_Handler implements JsonMessageHandler {
                 item.setCreatedAtMs(entry.getCreatedAtMs());
                 item.setReadAtMs(entry.getReadAtMs());
                 item.setBlobB64(Base64.getEncoder().encodeToString(entry.getRawBlock()));
+                DmDeliveryStateEntry delivery = deliveryByKey.get(entry.getMessageKey());
+                if (delivery != null) {
+                    item.setDeliveryState(delivery.deliveryStateCode());
+                }
                 items.add(item);
             }
             resp.setMessages(items);

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/Net_GetDmDeliveryStatus_Handler.java

@@ -0,0 +1,35 @@
+package server.logic.ws_protocol.JSON.messages;
+
+import server.logic.ws_protocol.JSON.ConnectionContext;
+import server.logic.ws_protocol.JSON.entyties.Net_Request;
+import server.logic.ws_protocol.JSON.entyties.Net_Response;
+import server.logic.ws_protocol.JSON.handlers.JsonMessageHandler;
+import server.logic.ws_protocol.JSON.messages.entyties.Net_GetDmDeliveryStatus_Request;
+import server.logic.ws_protocol.JSON.messages.entyties.Net_GetDmDeliveryStatus_Response;
+import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
+import server.logic.ws_protocol.WireCodes;
+import shine.db.dao.DmDeliveryStateDAO;
+import shine.db.entities.DmDeliveryStateEntry;
+
+/** Read-only проверка: доставил ли peer хотя бы одну копию получателю. */
+public class Net_GetDmDeliveryStatus_Handler implements JsonMessageHandler {
+    @Override
+    public Net_Response handle(Net_Request baseRequest, ConnectionContext ctx) throws Exception {
+        Net_GetDmDeliveryStatus_Request req = (Net_GetDmDeliveryStatus_Request) baseRequest;
+        if (req.getMessageKey() == null || req.getMessageKey().isBlank()) {
+            return NetExceptionResponseFactory.error(
+                    req, WireCodes.Status.BAD_REQUEST, "EMPTY_MESSAGE_KEY", "messageKey обязателен");
+        }
+        String messageKey = req.getMessageKey().trim();
+        DmDeliveryStateEntry state = DmDeliveryStateDAO.getInstance().getByOutgoingMessageKey(messageKey);
+
+        Net_GetDmDeliveryStatus_Response resp = new Net_GetDmDeliveryStatus_Response();
+        resp.setOp(req.getOp());
+        resp.setRequestId(req.getRequestId());
+        resp.setStatus(WireCodes.Status.OK);
+        resp.setMessageKey(messageKey);
+        resp.setKnown(state != null);
+        resp.setDelivered(state != null && state.isDelivered());
+        return resp;
+    }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/Net_MarkAllUserSettingsUnsynced_Handler.java

@@ -12,6 +12,8 @@ import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
 import server.logic.ws_protocol.WireCodes;
 import shine.db.DbController;
 import shine.db.dao.UserSettingsDAO;
+import shine.db.dao.DmSyncOutboxDAO;
+import server.sync.DmSyncWakeSignal;
 
 import java.sql.Connection;
 
@@ -23,16 +25,21 @@ public class Net_MarkAllUserSettingsUnsynced_Handler implements JsonMessageHandl
         Net_MarkAllUserSettingsUnsynced_Request req = (Net_MarkAllUserSettingsUnsynced_Request) baseRequest;
         try (Connection c = DbController.getInstance().getConnection()) {
             int updated;
+            int dmUpdated;
             if (req.getLogin() == null || req.getLogin().isBlank()) {
                 updated = UserSettingsDAO.getInstance().markAllUnsynced(c);
+                dmUpdated = DmSyncOutboxDAO.getInstance().markAllUnsynced();
             } else {
                 updated = UserSettingsDAO.getInstance().markAllUnsynced(c, req.getLogin().trim());
+                dmUpdated = DmSyncOutboxDAO.getInstance().markAllUnsynced(req.getLogin().trim());
             }
+            DmSyncWakeSignal.request();
             Net_MarkAllUserSettingsUnsynced_Response resp = new Net_MarkAllUserSettingsUnsynced_Response();
             resp.setOp(req.getOp());
             resp.setRequestId(req.getRequestId());
             resp.setStatus(WireCodes.Status.OK);
             resp.setUpdated(updated);
+            resp.setDmUpdated(dmUpdated);
             return resp;
         } catch (Exception e) {
             log.error("MarkAllUserSettingsUnsynced failed", e);

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/Net_ReceiveIncomingMessage_Handler.java

@@ -8,9 +8,12 @@ import server.logic.ws_protocol.JSON.messages.entyties.Net_ReceiveIncomingMessag
 import server.logic.ws_protocol.JSON.messages.entyties.Net_ReceiveIncomingMessage_Response;
 import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
 import server.logic.ws_protocol.WireCodes;
+import server.sync.DmDeliveryCoordinator;
+import shine.db.dao.DmSyncOutboxDAO;
 import shine.db.dao.SignedMessagesDAO;
 import shine.db.entities.SignedMessageEntry;
 
+import java.util.Arrays;
 import java.util.Base64;
 
 public class Net_ReceiveIncomingMessage_Handler implements JsonMessageHandler {
@@ -40,6 +43,10 @@ public class Net_ReceiveIncomingMessage_Handler implements JsonMessageHandler {
             return NetExceptionResponseFactory.error(req, status, code, "Сообщение не прошло проверку");
         }
 
+        if (!DmDeliveryCoordinator.isLocalAccessServer(incoming.toLogin)) {
+            return NetExceptionResponseFactory.error(req, 403, "LOCAL_SERVER_NOT_ACCESS_SERVER", "Сервер не обслуживает получателя сообщения");
+        }
+
         final SignedMessageEntry entry;
         try {
             entry = SignedMessagesCore.toEntry(incoming, "ReceiveIncomingMessage", null);
@@ -53,16 +60,27 @@ public class Net_ReceiveIncomingMessage_Handler implements JsonMessageHandler {
         SignedMessagesRealtime.DeliveryCounters counters = new SignedMessagesRealtime.DeliveryCounters();
         if (status.applied()) {
             counters = SignedMessagesRealtime.deliverToRelevantSessions(entry, incoming);
-            server.sync.DmFederationService.fanOutIncomingToRecipientAccessServers(
-                    incoming.toLogin,
-                    req.getIncomingBlobB64().trim(),
-                    req.getSourceServerLogin()
-            );
         }
         if (status == SignedMessagesDAO.ApplyStatus.BLOCKED_BY_CONVERSATION_TOMBSTONE) {
             bounceConversationDeleteIfKnown(incoming.fromLogin, incoming.toLogin);
+            return NetExceptionResponseFactory.error(req, 409, "BLOCKED_BY_CONVERSATION_TOMBSTONE", "Переписка уже удалена этой ревизией");
         }
 
+        SignedMessageEntry stored = SignedMessagesDAO.getInstance().getByMessageKey(entry.getMessageKey());
+        if (stored == null || !Arrays.equals(stored.getRawBlock(), entry.getRawBlock())) {
+            return NetExceptionResponseFactory.error(req, 409, "STALE_MESSAGE_REVISION", "На сервере уже есть более новая ревизия сообщения");
+        }
+        boolean receivedFromRecipientPeer = DmDeliveryCoordinator.sourceIsOtherAccessServer(
+                incoming.toLogin, req.getSourceServerLogin());
+        DmSyncOutboxDAO.getInstance().upsert(
+                incoming.toLogin,
+                entry.getMessageKey(),
+                DmDeliveryIds.forEntry(entry),
+                null,
+                receivedFromRecipientPeer,
+                entry.getCreatedAtMs()
+        );
+
         Net_ReceiveIncomingMessage_Response resp = new Net_ReceiveIncomingMessage_Response();
         resp.setOp(req.getOp());
         resp.setRequestId(req.getRequestId());

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/Net_SendMessagePair_Handler.java

@@ -8,10 +8,15 @@ import server.logic.ws_protocol.JSON.messages.entyties.Net_SendMessagePair_Reque
 import server.logic.ws_protocol.JSON.messages.entyties.Net_SendMessagePair_Response;
 import server.logic.ws_protocol.JSON.utils.NetExceptionResponseFactory;
 import server.logic.ws_protocol.WireCodes;
+import server.sync.DmDeliveryCoordinator;
 import server.sync.DmFederationService;
+import shine.db.dao.DmDeliveryStateDAO;
+import shine.db.dao.DmSyncOutboxDAO;
 import shine.db.dao.SignedMessagesDAO;
+import shine.db.entities.DmDeliveryStateEntry;
 import shine.db.entities.SignedMessageEntry;
 
+import java.util.Arrays;
 import java.util.Base64;
 
 public class Net_SendMessagePair_Handler implements JsonMessageHandler {
@@ -43,8 +48,9 @@ public class Net_SendMessagePair_Handler implements JsonMessageHandler {
 
         SignedMessageEntry incomingEntry;
         SignedMessageEntry outgoingEntry;
+        boolean fromPeer = !isBlank(req.getSourceServerLogin());
         try {
-            String sourceApi = "SendMessagePair";
+            String sourceApi = fromPeer ? "ReceiveOutcomingMessage" : "SendMessagePair";
             String originSessionId = (ctx != null && !isBlank(ctx.getSessionId())) ? ctx.getSessionId() : null;
             incomingEntry = SignedMessagesCore.toEntry(incoming, sourceApi, originSessionId);
             outgoingEntry = SignedMessagesCore.toEntry(outgoing, sourceApi, originSessionId);
@@ -79,15 +85,53 @@ public class Net_SendMessagePair_Handler implements JsonMessageHandler {
 
         if (pairStatus == SignedMessagesDAO.ApplyStatus.BLOCKED_BY_CONVERSATION_TOMBSTONE) {
             bounceConversationDeleteIfKnown(incoming.fromLogin, incoming.toLogin);
+            return NetExceptionResponseFactory.error(req, 409, "BLOCKED_BY_CONVERSATION_TOMBSTONE", "Переписка уже удалена этой ревизией");
         }
 
-        if (pairStatus.applied() && ctx != null && ctx.isAuthenticatedUser()) {
-            DmFederationService.fanOutPair(
-                    incoming.fromLogin,
-                    incoming.toLogin,
-                    req.getIncomingBlobB64().trim(),
-                    req.getOutgoingBlobB64().trim()
-            );
+        SignedMessageEntry storedOutgoing = SignedMessagesDAO.getInstance().getByMessageKey(outgoingEntry.getMessageKey());
+        if (storedOutgoing == null || !Arrays.equals(storedOutgoing.getRawBlock(), outgoingEntry.getRawBlock())) {
+            return NetExceptionResponseFactory.error(req, 409, "STALE_MESSAGE_REVISION", "На сервере уже есть более новая ревизия сообщения");
+        }
+
+        String eventId = DmDeliveryIds.forEntry(outgoingEntry);
+        long nowMs = System.currentTimeMillis();
+        long acceptedAtMs;
+        long signedAtMs = Math.max(outgoing.timeMs,
+                Math.max(outgoing.revisionTimeMs, outgoing.reencryptedAtMs));
+        acceptedAtMs = fromPeer && signedAtMs > 0L ? Math.min(nowMs, signedAtMs) : nowMs;
+        long expiresAtMs = acceptedAtMs + 60L * 60L * 1000L;
+        int initialState = DmDeliveryStateEntry.ACCEPTED;
+        DmDeliveryStateEntry delivery = DmDeliveryStateDAO.getInstance().upsertPair(
+                outgoingEntry.getMessageKey(), eventId, outgoingEntry.getBaseKey(),
+                outgoingEntry.getFromLogin(), outgoingEntry.getToLogin(), incomingEntry.getMessageKey(),
+                acceptedAtMs, expiresAtMs, initialState,
+                null, null, fromPeer && initialState == DmDeliveryStateEntry.PENDING_NONE
+        );
+
+        DmSyncOutboxDAO.getInstance().upsert(
+                outgoingEntry.getFromLogin(), outgoingEntry.getMessageKey(), eventId,
+                incomingEntry.getMessageKey(), fromPeer, acceptedAtMs);
+
+        // Если этот же сервер также обслуживает получателя, его входящая копия
+        // имеет отдельный sync-флаг владельца-получателя.
+        if (DmDeliveryCoordinator.isLocalAccessServer(incomingEntry.getToLogin())) {
+            boolean incomingAlreadySynced = DmDeliveryCoordinator.sourceIsOtherAccessServer(
+                    incomingEntry.getToLogin(), req.getSourceServerLogin());
+            DmSyncOutboxDAO.getInstance().upsert(
+                    incomingEntry.getToLogin(), incomingEntry.getMessageKey(), DmDeliveryIds.forEntry(incomingEntry),
+                    null, incomingAlreadySynced, acceptedAtMs);
+        }
+
+        if (delivery != null && pairStatus.applied()) {
+            if (fromPeer) {
+                DmDeliveryCoordinator.assistReceivedPairAsync(delivery.getEventId());
+            } else {
+                // Первая доставка выполняется до ответа клиенту. Два сервера
+                // получателя вызываются параллельно внутри координатора.
+                DmDeliveryCoordinator.processDueEntry(delivery);
+                delivery = DmDeliveryStateDAO.getInstance()
+                        .getByOutgoingMessageKey(outgoingEntry.getMessageKey());
+            }
         }
 
         Net_SendMessagePair_Response resp = new Net_SendMessagePair_Response();
@@ -99,6 +143,7 @@ public class Net_SendMessagePair_Handler implements JsonMessageHandler {
         resp.setOutgoingKey(outgoingEntry.getMessageKey());
         resp.setDeliveredWsSessions(inCounters.wsDelivered + outCounters.wsDelivered);
         resp.setDeliveredWebPushSessions(inCounters.pushDelivered + outCounters.pushDelivered);
+        resp.setDeliveryState(delivery.deliveryStateCode());
         return resp;
     }
 

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/entyties/Net_DmSyncBatch_Request.java

@@ -2,12 +2,16 @@ package server.logic.ws_protocol.JSON.messages.entyties;
 
 import server.logic.ws_protocol.JSON.entyties.Net_Request;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class Net_DmSyncBatch_Request extends Net_Request {
     private String ownerLogin;
     private Long afterStoredAtMs;
     private String afterMessageKey;
     private Integer limit;
     private Integer maxBytes;
+    private List<String> ackSyncIds = new ArrayList<>();
 
     public String getOwnerLogin() { return ownerLogin; }
     public void setOwnerLogin(String ownerLogin) { this.ownerLogin = ownerLogin; }
@@ -19,4 +23,8 @@ public class Net_DmSyncBatch_Request extends Net_Request {
     public void setLimit(Integer limit) { this.limit = limit; }
     public Integer getMaxBytes() { return maxBytes; }
     public void setMaxBytes(Integer maxBytes) { this.maxBytes = maxBytes; }
+    public List<String> getAckSyncIds() { return ackSyncIds; }
+    public void setAckSyncIds(List<String> ackSyncIds) {
+        this.ackSyncIds = ackSyncIds == null ? new ArrayList<>() : ackSyncIds;
+    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/entyties/Net_DmSyncBatch_Response.java

@@ -30,33 +30,20 @@ public class Net_DmSyncBatch_Response extends Net_Response {
     public void setItems(List<Item> items) { this.items = items; }
 
     public static class Item {
-        private String messageKey;
-        private String baseKey;
-        private String targetLogin;
-        private String fromLogin;
-        private String toLogin;
-        private int messageType;
-        private long timeMs;
+        private String syncId;
+        private String primaryMessageKey;
         private long storedAtMs;
-        private String blobB64;
+        private List<String> blobsB64 = new ArrayList<>();
 
-        public String getMessageKey() { return messageKey; }
-        public void setMessageKey(String messageKey) { this.messageKey = messageKey; }
-        public String getBaseKey() { return baseKey; }
-        public void setBaseKey(String baseKey) { this.baseKey = baseKey; }
-        public String getTargetLogin() { return targetLogin; }
-        public void setTargetLogin(String targetLogin) { this.targetLogin = targetLogin; }
-        public String getFromLogin() { return fromLogin; }
-        public void setFromLogin(String fromLogin) { this.fromLogin = fromLogin; }
-        public String getToLogin() { return toLogin; }
-        public void setToLogin(String toLogin) { this.toLogin = toLogin; }
-        public int getMessageType() { return messageType; }
-        public void setMessageType(int messageType) { this.messageType = messageType; }
-        public long getTimeMs() { return timeMs; }
-        public void setTimeMs(long timeMs) { this.timeMs = timeMs; }
+        public String getSyncId() { return syncId; }
+        public void setSyncId(String syncId) { this.syncId = syncId; }
+        public String getPrimaryMessageKey() { return primaryMessageKey; }
+        public void setPrimaryMessageKey(String primaryMessageKey) { this.primaryMessageKey = primaryMessageKey; }
         public long getStoredAtMs() { return storedAtMs; }
         public void setStoredAtMs(long storedAtMs) { this.storedAtMs = storedAtMs; }
-        public String getBlobB64() { return blobB64; }
-        public void setBlobB64(String blobB64) { this.blobB64 = blobB64; }
+        public List<String> getBlobsB64() { return blobsB64; }
+        public void setBlobsB64(List<String> blobsB64) {
+            this.blobsB64 = blobsB64 == null ? new ArrayList<>() : blobsB64;
+        }
     }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/entyties/Net_GetDirectMessages_Response.java

@@ -42,6 +42,7 @@ public class Net_GetDirectMessages_Response extends Net_Response {
         private long createdAtMs;
         private Long readAtMs;
         private String blobB64;
+        private String deliveryState;
 
         public String getMessageKey() { return messageKey; }
         public void setMessageKey(String messageKey) { this.messageKey = messageKey; }
@@ -67,5 +68,7 @@ public class Net_GetDirectMessages_Response extends Net_Response {
         public void setReadAtMs(Long readAtMs) { this.readAtMs = readAtMs; }
         public String getBlobB64() { return blobB64; }
         public void setBlobB64(String blobB64) { this.blobB64 = blobB64; }
+        public String getDeliveryState() { return deliveryState; }
+        public void setDeliveryState(String deliveryState) { this.deliveryState = deliveryState; }
     }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/entyties/Net_GetDmDeliveryStatus_Request.java

@@ -0,0 +1,10 @@
+package server.logic.ws_protocol.JSON.messages.entyties;
+
+import server.logic.ws_protocol.JSON.entyties.Net_Request;
+
+public class Net_GetDmDeliveryStatus_Request extends Net_Request {
+    private String messageKey;
+
+    public String getMessageKey() { return messageKey; }
+    public void setMessageKey(String value) { this.messageKey = value; }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/entyties/Net_GetDmDeliveryStatus_Response.java

@@ -0,0 +1,16 @@
+package server.logic.ws_protocol.JSON.messages.entyties;
+
+import server.logic.ws_protocol.JSON.entyties.Net_Response;
+
+public class Net_GetDmDeliveryStatus_Response extends Net_Response {
+    private String messageKey;
+    private boolean known;
+    private boolean delivered;
+
+    public String getMessageKey() { return messageKey; }
+    public void setMessageKey(String value) { this.messageKey = value; }
+    public boolean isKnown() { return known; }
+    public void setKnown(boolean value) { this.known = value; }
+    public boolean isDelivered() { return delivered; }
+    public void setDelivered(boolean value) { this.delivered = value; }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/entyties/Net_MarkAllUserSettingsUnsynced_Response.java

@@ -4,7 +4,10 @@ import server.logic.ws_protocol.JSON.entyties.Net_Response;
 
 public class Net_MarkAllUserSettingsUnsynced_Response extends Net_Response {
     private Integer updated;
+    private Integer dmUpdated;
 
     public Integer getUpdated() { return updated; }
     public void setUpdated(Integer updated) { this.updated = updated; }
+    public Integer getDmUpdated() { return dmUpdated; }
+    public void setDmUpdated(Integer dmUpdated) { this.dmUpdated = dmUpdated; }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/messages/entyties/Net_SendMessagePair_Response.java

@@ -8,6 +8,7 @@ public class Net_SendMessagePair_Response extends Net_Response {
     private String outgoingKey;
     private int deliveredWsSessions;
     private int deliveredWebPushSessions;
+    private String deliveryState;
 
     public String getBaseKey() { return baseKey; }
     public void setBaseKey(String baseKey) { this.baseKey = baseKey; }
@@ -19,4 +20,6 @@ public class Net_SendMessagePair_Response extends Net_Response {
     public void setDeliveredWsSessions(int deliveredWsSessions) { this.deliveredWsSessions = deliveredWsSessions; }
     public int getDeliveredWebPushSessions() { return deliveredWebPushSessions; }
     public void setDeliveredWebPushSessions(int deliveredWebPushSessions) { this.deliveredWebPushSessions = deliveredWebPushSessions; }
+    public String getDeliveryState() { return deliveryState; }
+    public void setDeliveryState(String deliveryState) { this.deliveryState = deliveryState; }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/sync/AddBlockSyncService.java

@@ -11,27 +11,19 @@ import shine.db.entities.BlockEntry;
 import shine.db.entities.SyncServerEntry;
 import utils.blockchain.BlockchainNameUtil;
 
-import java.net.URI;
-import java.net.http.HttpClient;
-import java.net.http.WebSocket;
-import java.nio.ByteBuffer;
-import java.time.Duration;
 import java.util.List;
 import java.util.Locale;
-import java.util.UUID;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicLong;
 
 /**
- * Фоновая one-shot репликация AddBlock на серверы из локальной таблицы sync_servers.
+ * Фоновая репликация AddBlock через общий постоянный WSS-пул на серверы
+ * из локальной таблицы sync_servers.
  */
 public final class AddBlockSyncService {
 
     private static final Logger log = LoggerFactory.getLogger(AddBlockSyncService.class);
     private static final ObjectMapper MAPPER = new ObjectMapper();
-    private static final HttpClient HTTP = HttpClient.newBuilder()
-            .connectTimeout(Duration.ofSeconds(6))
-            .build();
     private static final ExecutorService EXECUTOR = new ThreadPoolExecutor(
             1,
             Math.max(2, Runtime.getRuntime().availableProcessors()),
@@ -100,14 +92,14 @@ public final class AddBlockSyncService {
     }
 
     private void replicateToPartner(SyncServerEntry partner, String blockchainName, int blockNumber, BlockEntry currentBlock) throws Exception {
-        String wsUrl = buildWsUrl(partner.getServerAddress());
+        String wsUrl = ServerConnectionPool.buildWsUrl(partner.getServerAddress());
         if (wsUrl == null) {
             log.warn("AddBlock sync skipped: invalid server_address for partner login={} address={}",
                     partner.getLogin(), partner.getServerAddress());
             return;
         }
 
-        AddBlockPushResult firstTry = pushBlock(wsUrl, blockchainName, currentBlock);
+        AddBlockPushResult firstTry = pushBlock(partner, blockchainName, currentBlock);
         if (firstTry.ok()) {
             log.info("AddBlock sync ok: partner={} blockchainName={} blockNumber={}",
                     partner.getLogin(), blockchainName, blockNumber);
@@ -142,7 +134,7 @@ public final class AddBlockSyncService {
         }
 
         for (BlockEntry blockEntry : missingBlocks) {
-            AddBlockPushResult backfillResult = pushBlock(wsUrl, blockchainName, blockEntry);
+            AddBlockPushResult backfillResult = pushBlock(partner, blockchainName, blockEntry);
             if (!backfillResult.ok()) {
                 log.warn("AddBlock sync backfill failed: partner={} blockchainName={} blockNumber={} code={}",
                         partner.getLogin(), blockchainName, blockEntry.getBlockNumber(), backfillResult.code());
@@ -154,8 +146,8 @@ public final class AddBlockSyncService {
                 partner.getLogin(), blockchainName, fromBlockNumber, blockNumber);
     }
 
-    private AddBlockPushResult pushBlock(String wsUrl, String blockchainName, BlockEntry blockEntry) throws Exception {
-        JsonNode response = sendAddBlock(wsUrl, blockchainName, blockEntry);
+    private AddBlockPushResult pushBlock(SyncServerEntry partner, String blockchainName, BlockEntry blockEntry) throws Exception {
+        JsonNode response = sendAddBlock(partner, blockchainName, blockEntry);
         int status = response.path("status").asInt(500);
         if (status >= 200 && status < 300) {
             return AddBlockPushResult.success();
@@ -172,31 +164,16 @@ public final class AddBlockSyncService {
         return new AddBlockPushResult(false, status, code, serverLastGlobalNumber, serverLastGlobalHash);
     }
 
-    private JsonNode sendAddBlock(String wsUrl, String blockchainName, BlockEntry blockEntry) throws Exception {
-        CompletableFuture<String> responseFuture = new CompletableFuture<>();
-        CountDownLatch openLatch = new CountDownLatch(1);
-        SyncWsListener listener = new SyncWsListener(responseFuture, openLatch);
-
-        WebSocket webSocket = HTTP.newWebSocketBuilder()
-                .connectTimeout(Duration.ofSeconds(6))
-                .buildAsync(URI.create(wsUrl), listener)
-                .get(8, TimeUnit.SECONDS);
-
-        if (!openLatch.await(8, TimeUnit.SECONDS)) {
-            tryAbort(webSocket);
-            throw new TimeoutException("WS open timeout");
-        }
-
-        String requestId = "sync-" + UUID.randomUUID();
-        String json = buildAddBlockJson(requestId, blockchainName, blockEntry);
-        webSocket.sendText(json, true).get(8, TimeUnit.SECONDS);
-
-        String responseJson = responseFuture.get(12, TimeUnit.SECONDS);
-        tryAbort(webSocket);
-        return MAPPER.readTree(responseJson);
+    private JsonNode sendAddBlock(SyncServerEntry partner, String blockchainName, BlockEntry blockEntry) throws Exception {
+        String jsonTemplate = buildAddBlockJsonTemplate(blockchainName, blockEntry);
+        return ServerConnectionPool.getInstance().request(
+                partner.getLogin(),
+                partner.getServerAddress(),
+                jsonTemplate,
+                ServerConnectionPool.Priority.BULK);
     }
 
-    private String buildAddBlockJson(String requestId, String blockchainName, BlockEntry blockEntry) throws Exception {
+    private String buildAddBlockJsonTemplate(String blockchainName, BlockEntry blockEntry) throws Exception {
         String prevHashHex = blockEntry.getBlockNumber() <= 0
                 ? ""
                 : toHex(extractPrevHash32(blockEntry.getBlockBytes()));
@@ -205,8 +182,6 @@ public final class AddBlockSyncService {
         String safeBlockchainName = MAPPER.writeValueAsString(blockchainName);
         String safePrevHashHex = MAPPER.writeValueAsString(prevHashHex);
         String safeBlockBytes = MAPPER.writeValueAsString(blockBytesB64);
-        String safeRequestId = MAPPER.writeValueAsString(requestId);
-
         return """
             {
               "op":"AddBlock",
@@ -218,7 +193,7 @@ public final class AddBlockSyncService {
                 "blockBytesB64":%s
               }
             }
-            """.formatted(safeRequestId, safeBlockchainName, blockEntry.getBlockNumber(), safePrevHashHex, safeBlockBytes);
+            """.formatted("%s", safeBlockchainName, blockEntry.getBlockNumber(), safePrevHashHex, safeBlockBytes);
     }
 
     private static byte[] extractPrevHash32(byte[] blockBytes) {
@@ -240,32 +215,6 @@ public final class AddBlockSyncService {
         return s.isEmpty() ? null : s;
     }
 
-    private static String buildWsUrl(String serverAddressRaw) {
-        String host = normalizeHostLike(serverAddressRaw);
-        if (host == null) return null;
-        return "wss://" + host + "/ws";
-    }
-
-    private static String normalizeHostLike(String value) {
-        if (value == null) return null;
-        String raw = value.trim();
-        if (raw.isEmpty()) return null;
-        try {
-            String withScheme = raw.matches("^[a-zA-Z]+://.*$") ? raw : "https://" + raw;
-            URI uri = URI.create(withScheme);
-            String host = uri.getHost();
-            if (host == null || host.isBlank()) return null;
-            return host.trim().toLowerCase(Locale.ROOT);
-        } catch (Exception e) {
-            String cleaned = raw
-                    .replaceFirst("^[a-zA-Z]+://", "")
-                    .replaceFirst("/.*$", "")
-                    .trim()
-                    .toLowerCase(Locale.ROOT);
-            return cleaned.isEmpty() ? null : cleaned;
-        }
-    }
-
     private static String toHex(byte[] bytes) {
         if (bytes == null) return "";
         StringBuilder sb = new StringBuilder(bytes.length * 2);
@@ -276,17 +225,6 @@ public final class AddBlockSyncService {
         return sb.toString();
     }
 
-    private static void tryAbort(WebSocket webSocket) {
-        try {
-            webSocket.sendClose(WebSocket.NORMAL_CLOSURE, "ok");
-        } catch (Exception ignored) {
-        }
-        try {
-            webSocket.abort();
-        } catch (Exception ignored) {
-        }
-    }
-
     private record AddBlockPushResult(
             boolean ok,
             int status,
@@ -309,52 +247,4 @@ public final class AddBlockSyncService {
         }
     }
 
-    private static final class SyncWsListener implements WebSocket.Listener {
-        private final CompletableFuture<String> responseFuture;
-        private final CountDownLatch openLatch;
-        private final StringBuilder textBuffer = new StringBuilder();
-
-        private SyncWsListener(CompletableFuture<String> responseFuture, CountDownLatch openLatch) {
-            this.responseFuture = responseFuture;
-            this.openLatch = openLatch;
-        }
-
-        @Override
-        public void onOpen(WebSocket webSocket) {
-            openLatch.countDown();
-            webSocket.request(1);
-        }
-
-        @Override
-        public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
-            textBuffer.append(data);
-            if (last && !responseFuture.isDone()) {
-                responseFuture.complete(textBuffer.toString());
-            }
-            webSocket.request(1);
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public CompletionStage<?> onBinary(WebSocket webSocket, ByteBuffer data, boolean last) {
-            webSocket.request(1);
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public CompletionStage<?> onClose(WebSocket webSocket, int statusCode, String reason) {
-            if (!responseFuture.isDone()) {
-                responseFuture.completeExceptionally(new IllegalStateException("WS closed before response: " + statusCode + " " + reason));
-            }
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public void onError(WebSocket webSocket, Throwable error) {
-            if (!responseFuture.isDone()) {
-                responseFuture.completeExceptionally(error);
-            }
-            openLatch.countDown();
-        }
-    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/sync/DmDeliveryCoordinator.java

@@ -0,0 +1,311 @@
+package server.sync;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import server.logic.ws_protocol.JSON.messages.DmDeliveryRealtime;
+import shine.db.dao.DmDeliveryStateDAO;
+import shine.db.dao.DmSyncOutboxDAO;
+import shine.db.dao.SignedMessagesDAO;
+import shine.db.dao.UserAccessServersCurrentDAO;
+import shine.db.entities.DmDeliveryStateEntry;
+import shine.db.entities.SignedMessageEntry;
+import shine.db.entities.UserAccessServerRouteEntry;
+import utils.config.AppConfig;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.ThreadFactory;
+
+/**
+ * Координатор доставки исходящей DM-пары. Первая попытка выполняется до ответа
+ * клиенту, последующие — пятисекундным воркером.
+ */
+public final class DmDeliveryCoordinator {
+    private static final Logger log = LoggerFactory.getLogger(DmDeliveryCoordinator.class);
+    private static final long[] ATTEMPT_OFFSETS_MS = {
+            0L,
+            30_000L,
+            5L * 60_000L,
+            25L * 60_000L,
+            60L * 60_000L
+    };
+    private static final String SERVER_LOGIN_CONFIG = "server.SHiNE.login";
+    private static final RemoteDmSyncClient REMOTE = new RemoteDmSyncClient();
+    private static final DmDeliveryStateDAO DELIVERY_DAO = DmDeliveryStateDAO.getInstance();
+    private static final DmSyncOutboxDAO OUTBOX_DAO = DmSyncOutboxDAO.getInstance();
+    private static final SignedMessagesDAO MESSAGES_DAO = SignedMessagesDAO.getInstance();
+    private static final UserAccessServersCurrentDAO ACCESS_DAO = UserAccessServersCurrentDAO.getInstance();
+    private static final ExecutorService ASSIST_EXECUTOR = new ThreadPoolExecutor(
+            2, 2, 0L, TimeUnit.MILLISECONDS,
+            new ArrayBlockingQueue<>(500),
+            daemonThreadFactory("dm-peer-assist"),
+            new ThreadPoolExecutor.DiscardPolicy());
+    private static final ExecutorService RECIPIENT_EXECUTOR = new ThreadPoolExecutor(
+            4, 16, 60L, TimeUnit.SECONDS,
+            new ArrayBlockingQueue<>(1000),
+            daemonThreadFactory("dm-recipient-delivery"),
+            new ThreadPoolExecutor.CallerRunsPolicy());
+
+    private DmDeliveryCoordinator() {}
+
+    public static List<DmDeliveryStateEntry> listDue(int limit) throws Exception {
+        return DELIVERY_DAO.listDue(System.currentTimeMillis(), Math.max(1, limit));
+    }
+
+    public static void processDueEntry(DmDeliveryStateEntry snapshot) {
+        processDueEntry(snapshot, true);
+    }
+
+    private static void processDueEntry(DmDeliveryStateEntry snapshot, boolean allowInitialHandoff) {
+        if (snapshot == null) return;
+        try {
+            long now = System.currentTimeMillis();
+            Long nextAttemptAtMs = nextAttemptAt(snapshot.getCreatedAtMs(), snapshot.getAttemptIndex() + 1);
+            if (!DELIVERY_DAO.claimAttempt(snapshot, now, nextAttemptAtMs)) return;
+
+            DmDeliveryStateEntry current = DELIVERY_DAO.getByEventId(snapshot.getEventId());
+            if (current == null || current.isDelivered()
+                    || current.getDeliveryState() == DmDeliveryStateEntry.FAILED) return;
+
+            boolean finalAttempt = snapshot.getAttemptIndex() >= ATTEMPT_OFFSETS_MS.length - 1
+                    || now >= current.getDeliveryExpiresAtMs();
+
+            // Перед попытками на 5-й, 25-й и 60-й минутах сначала спрашиваем
+            // второй сервер отправителя: возможно, он уже доставил сообщение.
+            if (current.getDeliveryState() == DmDeliveryStateEntry.ACCEPTED
+                    && (snapshot.getAttemptIndex() >= 2 || finalAttempt)) {
+                current = acceptPeerDeliveryStatus(current);
+                if (current != null && current.isDelivered()) {
+                    DmDeliveryRealtime.notifySender(current);
+                    return;
+                }
+            }
+
+            DmDeliveryStateEntry afterAttempt = attemptRecipientRoutes(
+                    current, finalAttempt ? null : nextAttemptAtMs);
+
+            // После первой попытки сразу передаём полную пару второму серверу
+            // отправителя старой операцией ReceiveOutcomingMessage.
+            if (allowInitialHandoff && snapshot.getAttemptIndex() == 0 && afterAttempt != null) {
+                afterAttempt = handoffPairToSenderPeer(afterAttempt);
+            }
+
+            if (finalAttempt && afterAttempt != null && !afterAttempt.isDelivered()) {
+                afterAttempt = DELIVERY_DAO.finishAtExpiry(afterAttempt.getEventId(), System.currentTimeMillis());
+            }
+            DmDeliveryRealtime.notifySender(afterAttempt);
+        } catch (Exception e) {
+            log.warn("DM delivery attempt failed: eventId={}", snapshot.getEventId(), e);
+        }
+    }
+
+    public static void assistReceivedPairAsync(String eventId) {
+        if (eventId == null || eventId.isBlank()) return;
+        ASSIST_EXECUTOR.execute(() -> {
+            try {
+                DmDeliveryStateEntry row = DELIVERY_DAO.getByEventId(eventId);
+                if (row != null) processDueEntry(row, false);
+            } catch (Exception e) {
+                log.warn("DM peer assist failed: eventId={}", eventId, e);
+            }
+        });
+    }
+
+    private static DmDeliveryStateEntry attemptRecipientRoutes(
+            DmDeliveryStateEntry current,
+            Long nextAttemptAtMs
+    ) throws Exception {
+        if (current == null) return null;
+        List<UserAccessServerRouteEntry> routes = cappedRoutes(current.getToLogin());
+        String routesHash = routesHash(routes);
+        String alreadyDelivered = normalize(current.getDeliveredServerLogin());
+        List<String> acceptedLogins = new ArrayList<>();
+        if (alreadyDelivered != null) acceptedLogins.add(alreadyDelivered);
+
+        SignedMessageEntry incoming = MESSAGES_DAO.getByMessageKey(current.getIncomingMessageKey());
+        if (incoming == null || incoming.getRawBlock() == null) {
+            return DELIVERY_DAO.updateAfterAttempt(
+                    current.getEventId(), current.getDeliveryState(), current.getDeliveredServerLogin(),
+                    routesHash, nextAttemptAtMs, "INCOMING_BLOB_NOT_FOUND", System.currentTimeMillis());
+        }
+        String incomingBlobB64 = Base64.getEncoder().encodeToString(incoming.getRawBlock());
+        String ownServerLogin = ownServerLogin();
+        java.util.concurrent.CompletionService<RouteAttempt> completion =
+                new java.util.concurrent.ExecutorCompletionService<>(RECIPIENT_EXECUTOR);
+        int submitted = 0;
+        for (UserAccessServerRouteEntry route : routes) {
+            String routeLogin = normalize(route.getServerLogin());
+            if (routeLogin == null || acceptedLogins.contains(routeLogin)) continue;
+            completion.submit(() -> {
+                try {
+                    if (!routeLogin.equals(ownServerLogin)) {
+                        REMOTE.receiveIncomingMessage(
+                                routeLogin, route.getServerUrl(), incomingBlobB64, ownServerLogin);
+                    }
+                    return new RouteAttempt(routeLogin, null);
+                } catch (Exception e) {
+                    log.info("DM recipient server unavailable: messageKey={} server={}",
+                            current.getOutgoingMessageKey(), routeLogin);
+                    return new RouteAttempt(routeLogin, compactError(e));
+                }
+            });
+            submitted++;
+        }
+
+        String lastError = null;
+        for (int i = 0; i < submitted && acceptedLogins.isEmpty(); i++) {
+            RouteAttempt result = completion.take().get();
+            if (result.error() == null) {
+                acceptedLogins.add(result.serverLogin());
+            } else {
+                lastError = result.error();
+            }
+        }
+
+        int nextState = acceptedLogins.isEmpty()
+                ? DmDeliveryStateEntry.ACCEPTED
+                : DmDeliveryStateEntry.DELIVERED;
+        String oneLogin = acceptedLogins.isEmpty() ? null : acceptedLogins.get(0);
+        return DELIVERY_DAO.updateAfterAttempt(
+                current.getEventId(), nextState, oneLogin, routesHash,
+                nextAttemptAtMs, lastError, System.currentTimeMillis());
+    }
+
+    private static DmDeliveryStateEntry handoffPairToSenderPeer(DmDeliveryStateEntry current) throws Exception {
+        UserAccessServerRouteEntry peer = senderPeer(current.getFromLogin());
+        if (peer == null) return current;
+        SignedMessageEntry incoming = MESSAGES_DAO.getByMessageKey(current.getIncomingMessageKey());
+        SignedMessageEntry outgoing = MESSAGES_DAO.getByMessageKey(current.getOutgoingMessageKey());
+        if (incoming == null || outgoing == null) return current;
+        try {
+            REMOTE.sendMessagePair(
+                    peer.getServerLogin(),
+                    peer.getServerUrl(),
+                    Base64.getEncoder().encodeToString(incoming.getRawBlock()),
+                    Base64.getEncoder().encodeToString(outgoing.getRawBlock()),
+                    ownServerLogin());
+            OUTBOX_DAO.markSynced(current.getFromLogin(), current.getEventId());
+        } catch (Exception e) {
+            log.info("DM sender peer unavailable: eventId={} server={}", current.getEventId(), peer.getServerLogin());
+        }
+        return current;
+    }
+
+    private static DmDeliveryStateEntry acceptPeerDeliveryStatus(DmDeliveryStateEntry current) throws Exception {
+        UserAccessServerRouteEntry peer = senderPeer(current.getFromLogin());
+        if (peer == null) return current;
+        try {
+            RemoteDmSyncClient.RemoteDeliveryStatus remote = REMOTE.getDmDeliveryStatus(
+                    peer.getServerLogin(), peer.getServerUrl(), current.getOutgoingMessageKey());
+            if (remote.known() && remote.delivered()) {
+                return DELIVERY_DAO.markDeliveredFromPeer(current.getEventId(), System.currentTimeMillis());
+            }
+            return current;
+        } catch (Exception e) {
+            log.info("DM delivery status unavailable: eventId={} server={}", current.getEventId(), peer.getServerLogin());
+            return current;
+        }
+    }
+
+    private static UserAccessServerRouteEntry senderPeer(String senderLogin) throws Exception {
+        String own = ownServerLogin();
+        for (UserAccessServerRouteEntry route : cappedRoutes(senderLogin)) {
+            String routeLogin = normalize(route.getServerLogin());
+            if (routeLogin != null && !routeLogin.equals(own)) return route;
+        }
+        return null;
+    }
+
+    public static boolean isLocalAccessServer(String ownerLogin) throws Exception {
+        String own = ownServerLogin();
+        if (own == null) return false;
+        for (UserAccessServerRouteEntry route : cappedRoutes(ownerLogin)) {
+            if (own.equals(normalize(route.getServerLogin()))) return true;
+        }
+        return false;
+    }
+
+    public static boolean sourceIsOtherAccessServer(String ownerLogin, String sourceServerLogin) throws Exception {
+        String source = normalize(sourceServerLogin);
+        String own = ownServerLogin();
+        if (source == null || source.equals(own)) return false;
+        for (UserAccessServerRouteEntry route : cappedRoutes(ownerLogin)) {
+            if (source.equals(normalize(route.getServerLogin()))) return true;
+        }
+        return false;
+    }
+
+    public static String currentServerLogin() {
+        return ownServerLogin();
+    }
+
+    private static List<UserAccessServerRouteEntry> cappedRoutes(String ownerLogin) throws Exception {
+        Map<String, UserAccessServerRouteEntry> unique = new LinkedHashMap<>();
+        for (UserAccessServerRouteEntry route : ACCESS_DAO.listByUserLogin(ownerLogin)) {
+            if (route == null || route.getServerUrl() == null || route.getServerUrl().isBlank()) continue;
+            String login = normalize(route.getServerLogin());
+            if (login == null) continue;
+            unique.putIfAbsent(login, route);
+            if (unique.size() == 2) break;
+        }
+        return new ArrayList<>(unique.values());
+    }
+
+    private static String routesHash(List<UserAccessServerRouteEntry> routes) throws Exception {
+        List<String> logins = new ArrayList<>();
+        for (UserAccessServerRouteEntry route : routes) {
+            String login = normalize(route.getServerLogin());
+            if (login != null) logins.add(login);
+        }
+        logins.sort(String::compareTo);
+        MessageDigest digest = MessageDigest.getInstance("SHA-256");
+        byte[] hash = digest.digest(String.join("\n", logins).getBytes(StandardCharsets.UTF_8));
+        StringBuilder out = new StringBuilder(hash.length * 2);
+        for (byte b : hash) out.append(String.format("%02x", b & 0xff));
+        return out.toString();
+    }
+
+    private static Long nextAttemptAt(long createdAtMs, int nextAttemptIndex) {
+        if (nextAttemptIndex < 0 || nextAttemptIndex >= ATTEMPT_OFFSETS_MS.length) return null;
+        return createdAtMs + ATTEMPT_OFFSETS_MS[nextAttemptIndex];
+    }
+
+    private record RouteAttempt(String serverLogin, String error) {}
+
+    private static String ownServerLogin() {
+        return normalize(AppConfig.getInstance().getParam(SERVER_LOGIN_CONFIG));
+    }
+
+    private static String normalize(String value) {
+        if (value == null) return null;
+        String normalized = value.trim().toLowerCase(Locale.ROOT);
+        return normalized.isEmpty() ? null : normalized;
+    }
+
+    private static String compactError(Exception e) {
+        String text = String.valueOf(e == null ? "unknown" : e.getMessage());
+        return text.length() <= 500 ? text : text.substring(0, 500);
+    }
+
+    private static ThreadFactory daemonThreadFactory(String prefix) {
+        return new ThreadFactory() {
+            private int sequence;
+            @Override
+            public synchronized Thread newThread(Runnable r) {
+                Thread thread = new Thread(r, prefix + "-" + (++sequence));
+                thread.setDaemon(true);
+                return thread;
+            }
+        };
+    }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/sync/DmFederationService.java

@@ -27,12 +27,15 @@ public final class DmFederationService {
             String ownServerLogin = ownServerLogin();
             for (UserAccessServerRouteEntry route : senderRoutes.values()) {
                 if (isOwnServer(route, ownServerLogin)) continue;
-                REMOTE.sendMessagePair(route.getServerUrl(), incomingBlobB64, outgoingBlobB64, ownServerLogin);
+                REMOTE.sendMessagePair(
+                        route.getServerLogin(), route.getServerUrl(),
+                        incomingBlobB64, outgoingBlobB64, ownServerLogin);
             }
             for (UserAccessServerRouteEntry route : recipientRoutes.values()) {
                 if (isOwnServer(route, ownServerLogin)) continue;
                 if (senderRoutes.containsKey(normalize(route.getServerLogin()))) continue;
-                REMOTE.receiveIncomingMessage(route.getServerUrl(), incomingBlobB64, ownServerLogin);
+                REMOTE.receiveIncomingMessage(
+                        route.getServerLogin(), route.getServerUrl(), incomingBlobB64, ownServerLogin);
             }
         } catch (Exception e) {
             log.warn("DM federation pair fan-out failed: from={} to={}", fromLogin, toLogin, e);
@@ -54,7 +57,8 @@ public final class DmFederationService {
                 if (routeLogin == null) continue;
                 if (ownServerLogin != null && ownServerLogin.equalsIgnoreCase(routeLogin)) continue;
                 if (normalizedSource != null && normalizedSource.equalsIgnoreCase(routeLogin)) continue;
-                REMOTE.receiveIncomingMessage(route.getServerUrl(), incomingBlobB64, ownServerLogin);
+                REMOTE.receiveIncomingMessage(
+                        route.getServerLogin(), route.getServerUrl(), incomingBlobB64, ownServerLogin);
             }
         } catch (Exception e) {
             log.warn("DM federation incoming relay failed: to={}", toLogin, e);
@@ -79,9 +83,9 @@ public final class DmFederationService {
             for (UserAccessServerRouteEntry route : routes.values()) {
                 if (isOwnServer(route, ownServerLogin)) continue;
                 if (oneMessageDelete) {
-                    REMOTE.deleteMessage(route.getServerUrl(), blobB64);
+                    REMOTE.deleteMessage(route.getServerLogin(), route.getServerUrl(), blobB64);
                 } else {
-                    REMOTE.deleteConversation(route.getServerUrl(), blobB64);
+                    REMOTE.deleteConversation(route.getServerLogin(), route.getServerUrl(), blobB64);
                 }
             }
         } catch (Exception e) {

SHiNE-server/shine-server-net-protocol/src/main/java/server/sync/DmSyncWakeSignal.java

@@ -0,0 +1,17 @@
+package server.sync;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public final class DmSyncWakeSignal {
+    private static final AtomicBoolean REQUESTED = new AtomicBoolean(false);
+
+    private DmSyncWakeSignal() {}
+
+    public static void request() {
+        REQUESTED.set(true);
+    }
+
+    public static boolean consume() {
+        return REQUESTED.getAndSet(false);
+    }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/sync/RemoteBlockchainSyncClient.java

@@ -2,37 +2,22 @@ package server.sync;
 
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.net.URI;
-import java.net.http.HttpClient;
-import java.net.http.WebSocket;
-import java.nio.ByteBuffer;
-import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Locale;
-import java.util.UUID;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.CompletionStage;
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
 
 /**
  * Минимальный клиент для межсерверных JSON-op запросов по WSS.
  */
 public final class RemoteBlockchainSyncClient {
 
-    private static final Logger log = LoggerFactory.getLogger(RemoteBlockchainSyncClient.class);
     private static final ObjectMapper MAPPER = new ObjectMapper();
-    private static final HttpClient HTTP = HttpClient.newBuilder()
-            .connectTimeout(Duration.ofSeconds(6))
-            .build();
 
     public List<RemoteBlockchainHead> listBlockchainHeads(String serverAddressRaw) throws Exception {
-        JsonNode response = send(serverAddressRaw, """
+        return listBlockchainHeads(null, serverAddressRaw);
+    }
+
+    public List<RemoteBlockchainHead> listBlockchainHeads(String serverLogin, String serverAddressRaw) throws Exception {
+        JsonNode response = send(serverLogin, serverAddressRaw, """
             {
               "op":"ListBlockchainHeads",
               "requestId":%s,
@@ -62,8 +47,12 @@ public final class RemoteBlockchainSyncClient {
     }
 
     public RemoteSyncUserProfile getSyncUserProfile(String serverAddressRaw, String login) throws Exception {
+        return getSyncUserProfile(null, serverAddressRaw, login);
+    }
+
+    public RemoteSyncUserProfile getSyncUserProfile(String serverLogin, String serverAddressRaw, String login) throws Exception {
         String safeLogin = MAPPER.writeValueAsString(login);
-        JsonNode response = send(serverAddressRaw, """
+        JsonNode response = send(serverLogin, serverAddressRaw, """
             {
               "op":"GetSyncUserProfile",
               "requestId":%s,
@@ -96,9 +85,17 @@ public final class RemoteBlockchainSyncClient {
         );
     }
 
-    public RemoteBlockchainBlock getBlockchainBlock(String serverAddressRaw, String blockchainName, int blockNumber) throws Exception {
+    public RemoteBlockchainBlock getBlockchainBlock(
+            String serverAddressRaw, String blockchainName, int blockNumber
+    ) throws Exception {
+        return getBlockchainBlock(null, serverAddressRaw, blockchainName, blockNumber);
+    }
+
+    public RemoteBlockchainBlock getBlockchainBlock(
+            String serverLogin, String serverAddressRaw, String blockchainName, int blockNumber
+    ) throws Exception {
         String safeBlockchainName = MAPPER.writeValueAsString(blockchainName);
-        JsonNode response = send(serverAddressRaw, """
+        JsonNode response = send(serverLogin, serverAddressRaw, """
             {
               "op":"GetBlockchainBlock",
               "requestId":%s,
@@ -126,32 +123,12 @@ public final class RemoteBlockchainSyncClient {
         );
     }
 
-    private JsonNode send(String serverAddressRaw, String jsonTemplate) throws Exception {
-        String requestId = MAPPER.writeValueAsString("sync-" + UUID.randomUUID());
-        String json = jsonTemplate.formatted(requestId);
-        String wsUrl = buildWsUrl(serverAddressRaw);
-        if (wsUrl == null) {
-            throw new IllegalArgumentException("Invalid server address: " + serverAddressRaw);
-        }
-
-        CompletableFuture<String> responseFuture = new CompletableFuture<>();
-        CountDownLatch openLatch = new CountDownLatch(1);
-        SyncWsListener listener = new SyncWsListener(responseFuture, openLatch);
-
-        WebSocket webSocket = HTTP.newWebSocketBuilder()
-                .connectTimeout(Duration.ofSeconds(6))
-                .buildAsync(URI.create(wsUrl), listener)
-                .get(8, TimeUnit.SECONDS);
-
-        if (!openLatch.await(8, TimeUnit.SECONDS)) {
-            tryAbort(webSocket);
-            throw new TimeoutException("WS open timeout");
-        }
-
-        webSocket.sendText(json, true).get(8, TimeUnit.SECONDS);
-        String responseJson = responseFuture.get(12, TimeUnit.SECONDS);
-        tryAbort(webSocket);
-        return MAPPER.readTree(responseJson);
+    private JsonNode send(String serverLogin, String serverAddressRaw, String jsonTemplate) throws Exception {
+        return ServerConnectionPool.getInstance().request(
+                serverLogin,
+                serverAddressRaw,
+                jsonTemplate,
+                ServerConnectionPool.Priority.BULK);
     }
 
     private static String errorCode(JsonNode response) {
@@ -161,40 +138,7 @@ public final class RemoteBlockchainSyncClient {
     }
 
     static String buildWsUrl(String serverAddressRaw) {
-        String host = normalizeHostLike(serverAddressRaw);
-        if (host == null) return null;
-        return "wss://" + host + "/ws";
-    }
-
-    private static String normalizeHostLike(String value) {
-        if (value == null) return null;
-        String raw = value.trim();
-        if (raw.isEmpty()) return null;
-        try {
-            String withScheme = raw.matches("^[a-zA-Z]+://.*$") ? raw : "https://" + raw;
-            URI uri = URI.create(withScheme);
-            String host = uri.getHost();
-            if (host == null || host.isBlank()) return null;
-            return host.trim().toLowerCase(Locale.ROOT);
-        } catch (Exception e) {
-            String cleaned = raw
-                    .replaceFirst("^[a-zA-Z]+://", "")
-                    .replaceFirst("/.*$", "")
-                    .trim()
-                    .toLowerCase(Locale.ROOT);
-            return cleaned.isEmpty() ? null : cleaned;
-        }
-    }
-
-    private static void tryAbort(WebSocket webSocket) {
-        try {
-            webSocket.sendClose(WebSocket.NORMAL_CLOSURE, "ok");
-        } catch (Exception ignored) {
-        }
-        try {
-            webSocket.abort();
-        } catch (Exception ignored) {
-        }
+        return ServerConnectionPool.buildWsUrl(serverAddressRaw);
     }
 
     public record RemoteBlockchainHead(
@@ -220,53 +164,4 @@ public final class RemoteBlockchainSyncClient {
             long blockchainSizeLimitBytes
     ) {}
 
-    private static final class SyncWsListener implements WebSocket.Listener {
-        private final CompletableFuture<String> responseFuture;
-        private final CountDownLatch openLatch;
-        private final StringBuilder textBuffer = new StringBuilder();
-
-        private SyncWsListener(CompletableFuture<String> responseFuture, CountDownLatch openLatch) {
-            this.responseFuture = responseFuture;
-            this.openLatch = openLatch;
-        }
-
-        @Override
-        public void onOpen(WebSocket webSocket) {
-            openLatch.countDown();
-            webSocket.request(1);
-        }
-
-        @Override
-        public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
-            textBuffer.append(data);
-            if (last && !responseFuture.isDone()) {
-                responseFuture.complete(textBuffer.toString());
-            }
-            webSocket.request(1);
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public CompletionStage<?> onBinary(WebSocket webSocket, ByteBuffer data, boolean last) {
-            webSocket.request(1);
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public CompletionStage<?> onClose(WebSocket webSocket, int statusCode, String reason) {
-            if (!responseFuture.isDone()) {
-                responseFuture.completeExceptionally(new IllegalStateException("WS closed before response: " + statusCode + " " + reason));
-            }
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public void onError(WebSocket webSocket, Throwable error) {
-            log.warn("Remote sync websocket error: {}", String.valueOf(error));
-            if (!responseFuture.isDone()) {
-                responseFuture.completeExceptionally(error);
-            }
-            openLatch.countDown();
-        }
-    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/sync/RemoteDmSyncClient.java

@@ -3,31 +3,33 @@ package server.sync;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
-import java.net.URI;
-import java.net.http.HttpClient;
-import java.net.http.WebSocket;
-import java.nio.ByteBuffer;
-import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.UUID;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.CompletionStage;
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
 
+/** Клиент стабильных межсерверных DM-операций. */
 public final class RemoteDmSyncClient {
     private static final ObjectMapper MAPPER = new ObjectMapper();
-    private static final HttpClient HTTP = HttpClient.newBuilder()
-            .connectTimeout(Duration.ofSeconds(6))
-            .build();
 
-    public void sendMessagePair(String serverAddressRaw, String incomingBlobB64, String outgoingBlobB64, String sourceServerLogin) throws Exception {
+    public void sendMessagePair(
+            String serverAddressRaw,
+            String incomingBlobB64,
+            String outgoingBlobB64,
+            String sourceServerLogin
+    ) throws Exception {
+        sendMessagePair(null, serverAddressRaw, incomingBlobB64, outgoingBlobB64, sourceServerLogin);
+    }
+
+    public void sendMessagePair(
+            String targetServerLogin,
+            String serverAddressRaw,
+            String incomingBlobB64,
+            String outgoingBlobB64,
+            String sourceServerLogin
+    ) throws Exception {
         String incomingJson = MAPPER.writeValueAsString(incomingBlobB64);
         String outgoingJson = MAPPER.writeValueAsString(outgoingBlobB64);
         String sourceServerLoginJson = toOptionalJsonField("sourceServerLogin", sourceServerLogin);
-        JsonNode response = send(serverAddressRaw, """
+        JsonNode response = send(targetServerLogin, serverAddressRaw, """
             {
               "op":"ReceiveOutcomingMessage",
               "requestId":%s,
@@ -40,10 +42,23 @@ public final class RemoteDmSyncClient {
         ensureOk("ReceiveOutcomingMessage", response);
     }
 
-    public void receiveIncomingMessage(String serverAddressRaw, String incomingBlobB64, String sourceServerLogin) throws Exception {
+    public void receiveIncomingMessage(
+            String serverAddressRaw,
+            String incomingBlobB64,
+            String sourceServerLogin
+    ) throws Exception {
+        receiveIncomingMessage(null, serverAddressRaw, incomingBlobB64, sourceServerLogin);
+    }
+
+    public void receiveIncomingMessage(
+            String targetServerLogin,
+            String serverAddressRaw,
+            String incomingBlobB64,
+            String sourceServerLogin
+    ) throws Exception {
         String incomingJson = MAPPER.writeValueAsString(incomingBlobB64);
         String sourceServerLoginJson = toOptionalJsonField("sourceServerLogin", sourceServerLogin);
-        JsonNode response = send(serverAddressRaw, """
+        JsonNode response = send(targetServerLogin, serverAddressRaw, """
             {
               "op":"ReceiveIncomingMessage",
               "requestId":%s,
@@ -55,17 +70,74 @@ public final class RemoteDmSyncClient {
         ensureOk("ReceiveIncomingMessage", response);
     }
 
+    public RemoteDeliveryStatus getDmDeliveryStatus(String serverAddressRaw, String messageKey) throws Exception {
+        return getDmDeliveryStatus(null, serverAddressRaw, messageKey);
+    }
+
+    public RemoteDeliveryStatus getDmDeliveryStatus(
+            String targetServerLogin, String serverAddressRaw, String messageKey
+    ) throws Exception {
+        String messageKeyJson = MAPPER.writeValueAsString(messageKey);
+        JsonNode response = send(targetServerLogin, serverAddressRaw, """
+            {
+              "op":"GetDmDeliveryStatus",
+              "requestId":%s,
+              "payload":{
+                "messageKey":%s
+              }
+            }
+            """.formatted("%s", messageKeyJson));
+        ensureOk("GetDmDeliveryStatus", response);
+        JsonNode payload = response.path("payload");
+        return new RemoteDeliveryStatus(
+                payload.path("messageKey").asText(messageKey),
+                payload.path("known").asBoolean(false),
+                payload.path("delivered").asBoolean(false)
+        );
+    }
+
     public RemoteDmBatch dmSyncBatch(
             String serverAddressRaw,
             String ownerLogin,
             long afterStoredAtMs,
             String afterMessageKey,
             int limit,
-            int maxBytes
+            int maxBytes,
+            List<String> ackSyncIds
+    ) throws Exception {
+        return dmSyncBatch(null, serverAddressRaw, ownerLogin, afterStoredAtMs,
+                afterMessageKey, limit, maxBytes, ackSyncIds);
+    }
+
+    public RemoteDmBatch dmSyncBatch(
+            String targetServerLogin,
+            String serverAddressRaw,
+            String ownerLogin,
+            long afterStoredAtMs,
+            String afterMessageKey,
+            int limit,
+            int maxBytes,
+            List<String> ackSyncIds
+    ) throws Exception {
+        try (RemoteSyncSession session = new RemoteSyncSession(targetServerLogin, serverAddressRaw)) {
+            return dmSyncBatch(session, ownerLogin, afterStoredAtMs, afterMessageKey,
+                    limit, maxBytes, ackSyncIds);
+        }
+    }
+
+    public RemoteDmBatch dmSyncBatch(
+            RemoteSyncSession session,
+            String ownerLogin,
+            long afterStoredAtMs,
+            String afterMessageKey,
+            int limit,
+            int maxBytes,
+            List<String> ackSyncIds
     ) throws Exception {
         String ownerLoginJson = MAPPER.writeValueAsString(ownerLogin);
         String afterMessageKeyJson = MAPPER.writeValueAsString(afterMessageKey == null ? "" : afterMessageKey);
-        JsonNode response = send(serverAddressRaw, """
+        String ackSyncIdsJson = MAPPER.writeValueAsString(ackSyncIds == null ? List.of() : ackSyncIds);
+        JsonNode response = session.send("""
             {
               "op":"DmSyncBatch",
               "requestId":%s,
@@ -74,10 +146,12 @@ public final class RemoteDmSyncClient {
                 "afterStoredAtMs":%d,
                 "afterMessageKey":%s,
                 "limit":%d,
-                "maxBytes":%d
+                "maxBytes":%d,
+                "ackSyncIds":%s
               }
             }
-            """.formatted("%s", ownerLoginJson, Math.max(0L, afterStoredAtMs), afterMessageKeyJson, limit, maxBytes));
+            """.formatted("%s", ownerLoginJson, Math.max(0L, afterStoredAtMs), afterMessageKeyJson,
+                    limit, maxBytes, ackSyncIdsJson));
         ensureOk("DmSyncBatch", response);
 
         JsonNode payload = response.path("payload");
@@ -85,11 +159,17 @@ public final class RemoteDmSyncClient {
         JsonNode arr = payload.path("items");
         if (arr.isArray()) {
             for (JsonNode item : arr) {
+                List<String> blobs = new ArrayList<>();
+                JsonNode blobsNode = item.path("blobsB64");
+                if (blobsNode.isArray()) for (JsonNode blob : blobsNode) blobs.add(blob.asText(""));
+                if (blobs.isEmpty() && !item.path("blobB64").asText("").isBlank()) {
+                    blobs.add(item.path("blobB64").asText(""));
+                }
                 items.add(new RemoteDmItem(
-                        item.path("messageKey").asText(""),
+                        item.path("syncId").asText(""),
+                        item.path("primaryMessageKey").asText(item.path("messageKey").asText("")),
                         item.path("storedAtMs").asLong(0L),
-                        item.path("blobB64").asText("")
-                ));
+                        blobs));
             }
         }
         return new RemoteDmBatch(
@@ -101,65 +181,47 @@ public final class RemoteDmSyncClient {
     }
 
     public void deleteMessage(String serverAddressRaw, String blobB64) throws Exception {
+        deleteMessage(null, serverAddressRaw, blobB64);
+    }
+
+    public void deleteMessage(String targetServerLogin, String serverAddressRaw, String blobB64) throws Exception {
         String blobJson = MAPPER.writeValueAsString(blobB64);
-        JsonNode response = send(serverAddressRaw, """
+        JsonNode response = send(targetServerLogin, serverAddressRaw, """
             {
               "op":"DeleteMessage",
               "requestId":%s,
-              "payload":{
-                "blobB64":%s
-              }
+              "payload":{"blobB64":%s}
             }
             """.formatted("%s", blobJson));
         ensureOk("DeleteMessage", response);
     }
 
     public void deleteConversation(String serverAddressRaw, String blobB64) throws Exception {
+        deleteConversation(null, serverAddressRaw, blobB64);
+    }
+
+    public void deleteConversation(String targetServerLogin, String serverAddressRaw, String blobB64) throws Exception {
         String blobJson = MAPPER.writeValueAsString(blobB64);
-        JsonNode response = send(serverAddressRaw, """
+        JsonNode response = send(targetServerLogin, serverAddressRaw, """
             {
               "op":"DeleteConversation",
               "requestId":%s,
-              "payload":{
-                "blobB64":%s
-              }
+              "payload":{"blobB64":%s}
             }
             """.formatted("%s", blobJson));
         ensureOk("DeleteConversation", response);
     }
 
-    private JsonNode send(String serverAddressRaw, String jsonTemplate) throws Exception {
-        String requestId = MAPPER.writeValueAsString("dm-sync-" + UUID.randomUUID());
-        String json = jsonTemplate.formatted(requestId);
-        String wsUrl = RemoteBlockchainSyncClient.buildWsUrl(serverAddressRaw);
-        if (wsUrl == null) {
-            throw new IllegalArgumentException("Invalid server address: " + serverAddressRaw);
-        }
-
-        CompletableFuture<String> responseFuture = new CompletableFuture<>();
-        CountDownLatch openLatch = new CountDownLatch(1);
-        SyncWsListener listener = new SyncWsListener(responseFuture, openLatch);
-
-        WebSocket webSocket = HTTP.newWebSocketBuilder()
-                .connectTimeout(Duration.ofSeconds(6))
-                .buildAsync(URI.create(wsUrl), listener)
-                .get(8, TimeUnit.SECONDS);
-
-        if (!openLatch.await(8, TimeUnit.SECONDS)) {
-            tryAbort(webSocket);
-            throw new TimeoutException("WS open timeout");
-        }
-
-        webSocket.sendText(json, true).get(8, TimeUnit.SECONDS);
-        String responseJson = responseFuture.get(12, TimeUnit.SECONDS);
-        tryAbort(webSocket);
-        return MAPPER.readTree(responseJson);
+    private JsonNode send(String targetServerLogin, String serverAddressRaw, String jsonTemplate) throws Exception {
+        return ServerConnectionPool.getInstance().request(
+                targetServerLogin,
+                serverAddressRaw,
+                jsonTemplate,
+                ServerConnectionPool.Priority.REALTIME);
     }
 
     private String toOptionalJsonField(String fieldName, String value) throws Exception {
-        if (value == null || value.isBlank()) {
-            return "";
-        }
+        if (value == null || value.isBlank()) return "";
         return ",\n                \"" + fieldName + "\":" + MAPPER.writeValueAsString(value.trim());
     }
 
@@ -171,76 +233,10 @@ public final class RemoteDmSyncClient {
         throw new IllegalStateException(op + " failed: status=" + status + " code=" + code);
     }
 
-    private static void tryAbort(WebSocket webSocket) {
-        try {
-            webSocket.sendClose(WebSocket.NORMAL_CLOSURE, "ok");
-        } catch (Exception ignored) {
-        }
-        try {
-            webSocket.abort();
-        } catch (Exception ignored) {
-        }
-    }
-
-    public record RemoteDmBatch(
-            long nextStoredAtMs,
-            String nextMessageKey,
-            boolean hasMore,
-            List<RemoteDmItem> items
-    ) {}
-
+    public record RemoteDeliveryStatus(String messageKey, boolean known, boolean delivered) {}
+    public record RemoteDmBatch(long nextStoredAtMs, String nextMessageKey, boolean hasMore, List<RemoteDmItem> items) {}
     public record RemoteDmItem(
-            String messageKey,
-            long storedAtMs,
-            String blobB64
+            String syncId, String primaryMessageKey, long storedAtMs, List<String> blobsB64
     ) {}
 
-    private static final class SyncWsListener implements WebSocket.Listener {
-        private final CompletableFuture<String> responseFuture;
-        private final CountDownLatch openLatch;
-        private final StringBuilder textBuffer = new StringBuilder();
-
-        private SyncWsListener(CompletableFuture<String> responseFuture, CountDownLatch openLatch) {
-            this.responseFuture = responseFuture;
-            this.openLatch = openLatch;
-        }
-
-        @Override
-        public void onOpen(WebSocket webSocket) {
-            openLatch.countDown();
-            webSocket.request(1);
-        }
-
-        @Override
-        public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
-            textBuffer.append(data);
-            if (last && !responseFuture.isDone()) {
-                responseFuture.complete(textBuffer.toString());
-            }
-            webSocket.request(1);
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public CompletionStage<?> onBinary(WebSocket webSocket, ByteBuffer data, boolean last) {
-            webSocket.request(1);
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public CompletionStage<?> onClose(WebSocket webSocket, int statusCode, String reason) {
-            if (!responseFuture.isDone()) {
-                responseFuture.completeExceptionally(new IllegalStateException("WS closed before response: " + statusCode + " " + reason));
-            }
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public void onError(WebSocket webSocket, Throwable error) {
-            if (!responseFuture.isDone()) {
-                responseFuture.completeExceptionally(error);
-            }
-            openLatch.countDown();
-        }
-    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/sync/RemoteSyncSession.java

@@ -0,0 +1,35 @@
+package server.sync;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+/**
+ * Логический последовательный сеанс поверх общего постоянного WSS-пула.
+ * close() больше не закрывает физическое соединение с сервером.
+ */
+public final class RemoteSyncSession implements AutoCloseable {
+    private final String serverLogin;
+    private final String serverAddress;
+
+    /** Совместимый конструктор: при отсутствии логина пул использует адрес как ключ peer. */
+    public RemoteSyncSession(String serverAddressRaw) throws Exception {
+        this(null, serverAddressRaw);
+    }
+
+    public RemoteSyncSession(String serverLogin, String serverAddressRaw) {
+        this.serverLogin = serverLogin;
+        this.serverAddress = serverAddressRaw;
+    }
+
+    public synchronized JsonNode send(String jsonTemplate) throws Exception {
+        return ServerConnectionPool.getInstance().request(
+                serverLogin,
+                serverAddress,
+                jsonTemplate,
+                ServerConnectionPool.Priority.NORMAL);
+    }
+
+    @Override
+    public void close() {
+        // Физическое соединение принадлежит ServerConnectionPool.
+    }
+}

SHiNE-server/shine-server-net-protocol/src/main/java/server/sync/RemoteUserSettingsSyncClient.java

@@ -4,27 +4,28 @@ import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import shine.db.entities.UserSettingEntry;
 
-import java.net.URI;
-import java.net.http.HttpClient;
-import java.net.http.WebSocket;
-import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.UUID;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.CompletionStage;
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
 
 public final class RemoteUserSettingsSyncClient {
     private static final ObjectMapper MAPPER = new ObjectMapper();
-    private static final HttpClient HTTP = HttpClient.newBuilder()
-            .connectTimeout(Duration.ofSeconds(6))
-            .build();
 
-    public void upsertUserSetting(String serverAddressRaw, UserSettingEntry entry, boolean syncDelivery) throws Exception {
-        JsonNode response = send(serverAddressRaw, """
+    public void upsertUserSetting(
+            String serverAddressRaw, UserSettingEntry entry, boolean syncDelivery
+    ) throws Exception {
+        upsertUserSetting(null, serverAddressRaw, entry, syncDelivery);
+    }
+
+    public void upsertUserSetting(
+            String targetServerLogin, String serverAddressRaw, UserSettingEntry entry, boolean syncDelivery
+    ) throws Exception {
+        try (RemoteSyncSession session = new RemoteSyncSession(targetServerLogin, serverAddressRaw)) {
+            upsertUserSetting(session, entry, syncDelivery);
+        }
+    }
+
+    public void upsertUserSetting(RemoteSyncSession session, UserSettingEntry entry, boolean syncDelivery) throws Exception {
+        JsonNode response = session.send("""
             {
               "op":"UpsertUserSetting",
               "requestId":%s,
@@ -63,7 +64,33 @@ public final class RemoteUserSettingsSyncClient {
             int limit,
             int maxBytes
     ) throws Exception {
-        JsonNode response = send(serverAddressRaw, """
+        return userSettingsSyncBatch(null, serverAddressRaw, ownerLogin,
+                afterTimeMs, afterSettingKey, limit, maxBytes);
+    }
+
+    public RemoteUserSettingsBatch userSettingsSyncBatch(
+            String targetServerLogin,
+            String serverAddressRaw,
+            String ownerLogin,
+            long afterTimeMs,
+            String afterSettingKey,
+            int limit,
+            int maxBytes
+    ) throws Exception {
+        try (RemoteSyncSession session = new RemoteSyncSession(targetServerLogin, serverAddressRaw)) {
+            return userSettingsSyncBatch(session, ownerLogin, afterTimeMs, afterSettingKey, limit, maxBytes);
+        }
+    }
+
+    public RemoteUserSettingsBatch userSettingsSyncBatch(
+            RemoteSyncSession session,
+            String ownerLogin,
+            long afterTimeMs,
+            String afterSettingKey,
+            int limit,
+            int maxBytes
+    ) throws Exception {
+        JsonNode response = session.send("""
             {
               "op":"UserSettingsSyncBatch",
               "requestId":%s,
@@ -110,34 +137,6 @@ public final class RemoteUserSettingsSyncClient {
         );
     }
 
-    private JsonNode send(String serverAddressRaw, String jsonTemplate) throws Exception {
-        String requestId = MAPPER.writeValueAsString("user-settings-sync-" + UUID.randomUUID());
-        String json = jsonTemplate.formatted(requestId);
-        String wsUrl = RemoteBlockchainSyncClient.buildWsUrl(serverAddressRaw);
-        if (wsUrl == null) {
-            throw new IllegalArgumentException("Invalid server address: " + serverAddressRaw);
-        }
-
-        CompletableFuture<String> responseFuture = new CompletableFuture<>();
-        CountDownLatch openLatch = new CountDownLatch(1);
-        SyncWsListener listener = new SyncWsListener(responseFuture, openLatch);
-
-        WebSocket webSocket = HTTP.newWebSocketBuilder()
-                .connectTimeout(Duration.ofSeconds(6))
-                .buildAsync(URI.create(wsUrl), listener)
-                .get(8, TimeUnit.SECONDS);
-
-        if (!openLatch.await(8, TimeUnit.SECONDS)) {
-            tryAbort(webSocket);
-            throw new TimeoutException("WS open timeout");
-        }
-
-        webSocket.sendText(json, true).get(8, TimeUnit.SECONDS);
-        String responseJson = responseFuture.get(12, TimeUnit.SECONDS);
-        tryAbort(webSocket);
-        return MAPPER.readTree(responseJson);
-    }
-
     private void ensureOk(String op, JsonNode response) {
         int status = response.path("status").asInt(500);
         if (status >= 200 && status < 300) return;
@@ -146,17 +145,6 @@ public final class RemoteUserSettingsSyncClient {
         throw new IllegalStateException(op + " failed: status=" + status + " code=" + code);
     }
 
-    private static void tryAbort(WebSocket webSocket) {
-        try {
-            webSocket.sendClose(WebSocket.NORMAL_CLOSURE, "ok");
-        } catch (Exception ignored) {
-        }
-        try {
-            webSocket.abort();
-        } catch (Exception ignored) {
-        }
-    }
-
     public record RemoteUserSettingsBatch(
             long nextTimeMs,
             String nextSettingKey,
@@ -175,35 +163,4 @@ public final class RemoteUserSettingsSyncClient {
             String signature
     ) {}
 
-    private static final class SyncWsListener implements WebSocket.Listener {
-        private final CompletableFuture<String> responseFuture;
-        private final CountDownLatch openLatch;
-        private final StringBuilder textBuffer = new StringBuilder();
-
-        private SyncWsListener(CompletableFuture<String> responseFuture, CountDownLatch openLatch) {
-            this.responseFuture = responseFuture;
-            this.openLatch = openLatch;
-        }
-
-        @Override
-        public void onOpen(WebSocket webSocket) {
-            openLatch.countDown();
-            webSocket.request(1);
-        }
-
-        @Override
-        public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
-            textBuffer.append(data);
-            if (last && !responseFuture.isDone()) {
-                responseFuture.complete(textBuffer.toString());
-            }
-            webSocket.request(1);
-            return CompletableFuture.completedFuture(null);
-        }
-
-        @Override
-        public void onError(WebSocket webSocket, Throwable error) {
-            responseFuture.completeExceptionally(error);
-        }
-    }
 }

SHiNE-server/shine-server-net-protocol/src/main/java/server/sync/ServerConnectionPool.java

@@ -0,0 +1,763 @@
+package server.sync;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import shine.db.dao.SyncServersDAO;
+import shine.db.dao.UserAccessServersCurrentDAO;
+import shine.db.entities.SyncServerEntry;
+import shine.db.entities.UserAccessServerRouteEntry;
+import utils.config.AppConfig;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.WebSocket;
+import java.nio.ByteBuffer;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
+import java.util.concurrent.PriorityBlockingQueue;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * Общий пул постоянных WSS-соединений между физическими серверами SHiNE.
+ *
+ * <p>Пул меняет только транспорт: существующие JSON-операции, ACK, outbox и
+ * расписания повторов остаются обязанностью вызывающих сервисов.</p>
+ */
+public final class ServerConnectionPool implements AutoCloseable {
+    private static final Logger log = LoggerFactory.getLogger(ServerConnectionPool.class);
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+    private static final String SERVER_LOGIN_CONFIG = "server.SHiNE.login";
+    private static final int REQUEST_WORKERS = Math.max(
+            8, Math.min(32, Runtime.getRuntime().availableProcessors() * 2));
+    private static final int CONNECTION_WORKERS = Math.max(
+            4, Math.min(16, Runtime.getRuntime().availableProcessors()));
+    private static final ServerConnectionPool INSTANCE = new ServerConnectionPool();
+
+    private final HttpClient http = HttpClient.newBuilder()
+            .connectTimeout(Duration.ofSeconds(6))
+            .build();
+    private final ConcurrentHashMap<String, PeerConnection> peers = new ConcurrentHashMap<>();
+    private final AtomicBoolean started = new AtomicBoolean(false);
+    private final AtomicBoolean closed = new AtomicBoolean(false);
+    private final AtomicLong requestSequence = new AtomicLong();
+
+    private final ThreadPoolExecutor requestExecutor = new ThreadPoolExecutor(
+            REQUEST_WORKERS,
+            REQUEST_WORKERS,
+            60L,
+            TimeUnit.SECONDS,
+            new java.util.concurrent.LinkedBlockingQueue<>(10_000),
+            daemonThreadFactory("server-pool-request"),
+            new ThreadPoolExecutor.CallerRunsPolicy());
+    private final ThreadPoolExecutor connectionExecutor = new ThreadPoolExecutor(
+            CONNECTION_WORKERS,
+            CONNECTION_WORKERS,
+            60L,
+            TimeUnit.SECONDS,
+            new java.util.concurrent.LinkedBlockingQueue<>(10_000),
+            daemonThreadFactory("server-pool-connect"),
+            new ThreadPoolExecutor.DiscardPolicy());
+    private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(
+            2, daemonThreadFactory("server-pool-scheduler"));
+
+    private ServerConnectionPool() {}
+
+    public static ServerConnectionPool getInstance() {
+        return INSTANCE;
+    }
+
+    public void startOrLog() {
+        if (closed.get() || !started.compareAndSet(false, true)) return;
+        scheduler.scheduleWithFixedDelay(this::refreshKnownPeersSafe, 0L, 30L, TimeUnit.SECONDS);
+        scheduler.scheduleWithFixedDelay(this::healthCheckSafe, 10L, 10L, TimeUnit.SECONDS);
+        scheduler.scheduleWithFixedDelay(this::logMetricsSafe, 5L, 5L, TimeUnit.MINUTES);
+        log.info("Server connection pool started: adaptive ping={}s pongTimeout={}s",
+                pingIdleSeconds(), pongTimeoutSeconds());
+    }
+
+    public JsonNode request(
+            String serverLogin,
+            String serverAddress,
+            String jsonTemplate,
+            Priority priority
+    ) throws Exception {
+        startOrLog();
+        String normalizedLogin = normalizeLogin(serverLogin);
+        if (normalizedLogin == null) {
+            normalizedLogin = loginFromAddress(serverAddress);
+        }
+        if (normalizedLogin == null) {
+            throw new IllegalArgumentException("Server login and address are empty");
+        }
+        PeerConnection peer = registerPeer(normalizedLogin, serverAddress);
+        return peer.request(jsonTemplate, priority == null ? Priority.NORMAL : priority);
+    }
+
+    public PeerConnection registerPeer(String serverLogin, String serverAddress) {
+        String login = normalizeLogin(serverLogin);
+        String wsUrl = buildWsUrl(serverAddress);
+        if (login == null || wsUrl == null) {
+            throw new IllegalArgumentException("Invalid server peer: login=" + serverLogin + " address=" + serverAddress);
+        }
+        PeerConnection peer = peers.computeIfAbsent(login, ignored -> new PeerConnection(login, wsUrl));
+        peer.updateWsUrl(wsUrl);
+        peer.ensureConnectedInBackground(0L);
+        return peer;
+    }
+
+    public List<PeerMetricsSnapshot> snapshotMetrics() {
+        List<PeerMetricsSnapshot> result = new ArrayList<>();
+        for (PeerConnection peer : peers.values()) result.add(peer.snapshot());
+        result.sort(Comparator.comparing(PeerMetricsSnapshot::serverLogin));
+        return List.copyOf(result);
+    }
+
+    private void refreshKnownPeersSafe() {
+        if (closed.get()) return;
+        try {
+            String ownLogin = normalizeLogin(AppConfig.getInstance().getParam(SERVER_LOGIN_CONFIG));
+            Map<String, String> discovered = new LinkedHashMap<>();
+            for (SyncServerEntry entry : SyncServersDAO.getInstance().listAll()) {
+                if (entry == null) continue;
+                putDiscovered(discovered, ownLogin, entry.getLogin(), entry.getServerAddress());
+            }
+            for (UserAccessServerRouteEntry entry : UserAccessServersCurrentDAO.getInstance().listDistinctServers()) {
+                if (entry == null) continue;
+                putDiscovered(discovered, ownLogin, entry.getServerLogin(), entry.getServerUrl());
+            }
+            for (Map.Entry<String, String> entry : discovered.entrySet()) {
+                try {
+                    registerPeer(entry.getKey(), entry.getValue());
+                } catch (Exception e) {
+                    log.warn("Server pool peer registration failed: server={} reason={}",
+                            entry.getKey(), compactError(e));
+                }
+            }
+        } catch (Exception e) {
+            log.warn("Server pool peer refresh failed: {}", compactError(e));
+        }
+    }
+
+    private static void putDiscovered(
+            Map<String, String> discovered,
+            String ownLogin,
+            String serverLogin,
+            String serverAddress
+    ) {
+        String login = normalizeLogin(serverLogin);
+        if (login == null || login.equals(ownLogin) || buildWsUrl(serverAddress) == null) return;
+        discovered.put(login, serverAddress);
+    }
+
+    private void healthCheckSafe() {
+        if (closed.get()) return;
+        for (PeerConnection peer : peers.values()) {
+            try {
+                peer.healthCheck();
+            } catch (Exception e) {
+                log.debug("Server pool health check failed: server={} reason={}",
+                        peer.serverLogin, compactError(e));
+            }
+        }
+    }
+
+    private void logMetricsSafe() {
+        if (closed.get() || peers.isEmpty()) return;
+        long connected = peers.values().stream().filter(p -> p.state == ConnectionState.CONNECTED).count();
+        int queued = peers.values().stream().mapToInt(p -> p.queuedCount.get()).sum();
+        long errors = peers.values().stream().mapToLong(p -> p.failedRequests.get()).sum();
+        log.info("Server pool metrics: peers={} connected={} queued={} failedRequests={}",
+                peers.size(), connected, queued, errors);
+    }
+
+    @Override
+    public void close() {
+        if (!closed.compareAndSet(false, true)) return;
+        for (PeerConnection peer : peers.values()) peer.closeConnection("pool_shutdown");
+        scheduler.shutdownNow();
+        requestExecutor.shutdownNow();
+        connectionExecutor.shutdownNow();
+        peers.clear();
+    }
+
+    public enum Priority {
+        REALTIME(0),
+        NORMAL(1),
+        BULK(2);
+
+        private final int rank;
+        Priority(int rank) { this.rank = rank; }
+    }
+
+    public enum ConnectionState {
+        DISCONNECTED,
+        CONNECTING,
+        CONNECTED,
+        CLOSED
+    }
+
+    public record PeerMetricsSnapshot(
+            String serverLogin,
+            String wsUrl,
+            ConnectionState state,
+            long connectedAtMs,
+            long lastActivityAtMs,
+            long lastPingAtMs,
+            long lastPongAtMs,
+            long reconnectCount,
+            int queuedRealtime,
+            int queuedNormal,
+            int queuedBulk,
+            long successfulRequests,
+            long failedRequests,
+            long timedOutRequests,
+            String lastError
+    ) {}
+
+    public final class PeerConnection {
+        private final String serverLogin;
+        private final PriorityBlockingQueue<QueuedRequest> queue = new PriorityBlockingQueue<>();
+        private final ConcurrentHashMap<String, CompletableFuture<JsonNode>> pending = new ConcurrentHashMap<>();
+        private final AtomicBoolean drainScheduled = new AtomicBoolean(false);
+        private final AtomicBoolean reconnectScheduled = new AtomicBoolean(false);
+        private final AtomicInteger queuedCount = new AtomicInteger();
+        private final AtomicInteger reconnectAttempt = new AtomicInteger();
+        private final AtomicLong generation = new AtomicLong();
+        private final AtomicLong reconnectCount = new AtomicLong();
+        private final AtomicLong successfulRequests = new AtomicLong();
+        private final AtomicLong failedRequests = new AtomicLong();
+        private final AtomicLong timedOutRequests = new AtomicLong();
+        private final Object connectLock = new Object();
+
+        private volatile String wsUrl;
+        private volatile ConnectionState state = ConnectionState.DISCONNECTED;
+        private volatile WebSocket webSocket;
+        private volatile CompletableFuture<Void> readiness;
+        private volatile long connectedAtMs;
+        private volatile long lastActivityAtMs = System.currentTimeMillis();
+        private volatile long lastPingAtMs;
+        private volatile long lastPongAtMs;
+        private volatile long pingAwaitedSinceMs;
+        private volatile String lastError = "";
+
+        private PeerConnection(String serverLogin, String wsUrl) {
+            this.serverLogin = serverLogin;
+            this.wsUrl = wsUrl;
+        }
+
+        private JsonNode request(String jsonTemplate, Priority priority) throws Exception {
+            if (jsonTemplate == null || jsonTemplate.isBlank()) {
+                throw new IllegalArgumentException("JSON request template is empty");
+            }
+            int maxQueue = (int) configLong("server.pool.maxQueuePerPeer", 2_000L, 10L, 100_000L);
+            int queued = queuedCount.incrementAndGet();
+            if (queued > maxQueue) {
+                queuedCount.decrementAndGet();
+                throw new IllegalStateException("Server peer queue is full: " + serverLogin);
+            }
+
+            QueuedRequest task = new QueuedRequest(
+                    priority,
+                    requestSequence.incrementAndGet(),
+                    jsonTemplate,
+                    new CompletableFuture<>());
+            queue.offer(task);
+            scheduleDrain();
+
+            long timeoutSeconds = configLong("server.pool.callerTimeoutSeconds", 35L, 5L, 120L);
+            try {
+                return task.result.get(timeoutSeconds, TimeUnit.SECONDS);
+            } catch (java.util.concurrent.TimeoutException e) {
+                timedOutRequests.incrementAndGet();
+                if (queue.remove(task)) queuedCount.decrementAndGet();
+                throw new TimeoutException("Server pool caller timeout: " + serverLogin);
+            }
+        }
+
+        private void scheduleDrain() {
+            if (!drainScheduled.compareAndSet(false, true)) return;
+            requestExecutor.execute(this::drainQueue);
+        }
+
+        private void drainQueue() {
+            try {
+                for (;;) {
+                    QueuedRequest task = queue.poll();
+                    if (task == null) return;
+                    queuedCount.decrementAndGet();
+                    if (task.result.isDone()) continue;
+                    try {
+                        ensureConnectedBlocking();
+                        JsonNode response = sendTemplate(task.jsonTemplate)
+                                .get(requestTimeoutSeconds(), TimeUnit.SECONDS);
+                        successfulRequests.incrementAndGet();
+                        task.result.complete(response);
+                    } catch (java.util.concurrent.TimeoutException e) {
+                        timedOutRequests.incrementAndGet();
+                        failedRequests.incrementAndGet();
+                        task.result.completeExceptionally(
+                                new TimeoutException("Server pool response timeout: " + serverLogin));
+                        invalidateConnection("response_timeout", e);
+                    } catch (Exception e) {
+                        failedRequests.incrementAndGet();
+                        task.result.completeExceptionally(unwrap(e));
+                        if (state != ConnectionState.DISCONNECTED) {
+                            invalidateConnection("request_failed", e);
+                        }
+                    }
+                }
+            } finally {
+                drainScheduled.set(false);
+                if (!queue.isEmpty()) scheduleDrain();
+            }
+        }
+
+        private void ensureConnectedBlocking() throws Exception {
+            CompletableFuture<Void> localReady;
+            synchronized (connectLock) {
+                if (state == ConnectionState.CONNECTED && webSocket != null && !webSocket.isOutputClosed()) return;
+                if (state == ConnectionState.CLOSED || closed.get()) {
+                    throw new IllegalStateException("Server connection pool is closed");
+                }
+                if (readiness == null || readiness.isDone()) startConnectLocked();
+                localReady = readiness;
+            }
+            localReady.get(connectAndHelloTimeoutSeconds(), TimeUnit.SECONDS);
+        }
+
+        private void startConnectLocked() {
+            long currentGeneration = generation.incrementAndGet();
+            state = ConnectionState.CONNECTING;
+            lastError = "";
+            CompletableFuture<Void> ready = new CompletableFuture<>();
+            readiness = ready;
+            Listener listener = new Listener(this, currentGeneration);
+
+            http.newWebSocketBuilder()
+                    .connectTimeout(Duration.ofSeconds(6))
+                    .buildAsync(URI.create(wsUrl), listener)
+                    .thenCompose(ws -> {
+                        if (generation.get() != currentGeneration) {
+                            try { ws.abort(); } catch (Exception ignored) {}
+                            return CompletableFuture.failedFuture(new IllegalStateException("Superseded server connection"));
+                        }
+                        webSocket = ws;
+                        return sendServerHello(ws);
+                    })
+                    .whenComplete((ignored, error) -> {
+                        if (error != null) {
+                            ready.completeExceptionally(unwrap(error));
+                            invalidateConnection(currentGeneration, "connect_or_hello_failed", error);
+                            return;
+                        }
+                        if (generation.get() != currentGeneration) {
+                            ready.completeExceptionally(new IllegalStateException("Superseded server connection"));
+                            return;
+                        }
+                        long now = System.currentTimeMillis();
+                        connectedAtMs = now;
+                        lastActivityAtMs = now;
+                        lastPongAtMs = now;
+                        pingAwaitedSinceMs = 0L;
+                        reconnectAttempt.set(0);
+                        state = ConnectionState.CONNECTED;
+                        ready.complete(null);
+                        log.info("Server pool connected: server={} url={}", serverLogin, wsUrl);
+                    });
+        }
+
+        private CompletableFuture<Void> sendServerHello(WebSocket ws) {
+            try {
+                String ownLogin = normalizeLogin(AppConfig.getInstance().getParam(SERVER_LOGIN_CONFIG));
+                if (ownLogin == null) ownLogin = "unconfigured-server";
+                String requestId = "server-hello-" + UUID.randomUUID();
+                CompletableFuture<JsonNode> response = new CompletableFuture<>();
+                pending.put(requestId, response);
+                String json = """
+                    {
+                      "op":"ServerHello",
+                      "requestId":%s,
+                      "payload":{
+                        "serverLogin":%s,
+                        "protocolVersion":1,
+                        "capabilities":["dm-sync","settings-sync","block-sync","connection-pool"]
+                      }
+                    }
+                    """.formatted(
+                        MAPPER.writeValueAsString(requestId),
+                        MAPPER.writeValueAsString(ownLogin));
+                lastActivityAtMs = System.currentTimeMillis();
+                ws.sendText(json, true).whenComplete((ignored, error) -> {
+                    if (error != null) {
+                        pending.remove(requestId);
+                        response.completeExceptionally(error);
+                    }
+                });
+                return response.orTimeout(requestTimeoutSeconds(), TimeUnit.SECONDS)
+                        .thenAccept(node -> ensureOk("ServerHello", node));
+            } catch (Exception e) {
+                return CompletableFuture.failedFuture(e);
+            }
+        }
+
+        private CompletableFuture<JsonNode> sendTemplate(String jsonTemplate) throws Exception {
+            WebSocket ws = webSocket;
+            if (state != ConnectionState.CONNECTED || ws == null || ws.isOutputClosed()) {
+                return CompletableFuture.failedFuture(new IllegalStateException("Server peer is disconnected"));
+            }
+            String requestId = "server-pool-" + UUID.randomUUID();
+            String requestIdJson = MAPPER.writeValueAsString(requestId);
+            String json = fillRequestId(jsonTemplate, requestIdJson);
+            CompletableFuture<JsonNode> response = new CompletableFuture<>();
+            pending.put(requestId, response);
+            lastActivityAtMs = System.currentTimeMillis();
+            ws.sendText(json, true).whenComplete((ignored, error) -> {
+                if (error != null) {
+                    pending.remove(requestId);
+                    response.completeExceptionally(error);
+                }
+            });
+            return response;
+        }
+
+        private void acceptText(long listenerGeneration, String text) {
+            if (generation.get() != listenerGeneration || text == null || text.isBlank()) return;
+            lastActivityAtMs = System.currentTimeMillis();
+            try {
+                JsonNode node = MAPPER.readTree(text);
+                String requestId = node.path("requestId").asText("");
+                CompletableFuture<JsonNode> response = requestId.isBlank() ? null : pending.remove(requestId);
+                if (response != null) {
+                    response.complete(node);
+                } else {
+                    log.debug("Server pool ignored unmatched frame: server={} requestId={} op={}",
+                            serverLogin, requestId, node.path("op").asText(""));
+                }
+            } catch (Exception e) {
+                log.warn("Server pool received invalid JSON: server={} reason={}", serverLogin, compactError(e));
+            }
+        }
+
+        private void healthCheck() {
+            if (state == ConnectionState.DISCONNECTED) {
+                ensureConnectedInBackground(reconnectDelayMillis(reconnectAttempt.get()));
+                return;
+            }
+            if (state != ConnectionState.CONNECTED) return;
+            long now = System.currentTimeMillis();
+            if (pingAwaitedSinceMs > 0L) {
+                if (now - pingAwaitedSinceMs >= TimeUnit.SECONDS.toMillis(pongTimeoutSeconds())) {
+                    invalidateConnection("pong_timeout", new TimeoutException("Pong timeout"));
+                }
+                return;
+            }
+            if (now - lastActivityAtMs < TimeUnit.SECONDS.toMillis(pingIdleSeconds())) return;
+            WebSocket ws = webSocket;
+            if (ws == null || ws.isOutputClosed()) {
+                invalidateConnection("socket_closed", null);
+                return;
+            }
+            long nonce = now;
+            pingAwaitedSinceMs = now;
+            lastPingAtMs = now;
+            ws.sendPing(ByteBuffer.allocate(Long.BYTES).putLong(0, nonce))
+                    .whenComplete((ignored, error) -> {
+                        if (error != null) invalidateConnection("ping_failed", error);
+                    });
+        }
+
+        private void acceptPong(long listenerGeneration) {
+            if (generation.get() != listenerGeneration) return;
+            long now = System.currentTimeMillis();
+            lastPongAtMs = now;
+            lastActivityAtMs = now;
+            pingAwaitedSinceMs = 0L;
+        }
+
+        private void updateWsUrl(String newWsUrl) {
+            if (newWsUrl.equals(wsUrl)) return;
+            wsUrl = newWsUrl;
+            invalidateConnection("peer_url_changed", null);
+        }
+
+        private void ensureConnectedInBackground(long delayMs) {
+            if (closed.get() || state == ConnectionState.CLOSED) return;
+            if (!reconnectScheduled.compareAndSet(false, true)) return;
+            scheduler.schedule(() -> {
+                reconnectScheduled.set(false);
+                if (closed.get() || state == ConnectionState.CLOSED || state == ConnectionState.CONNECTED) return;
+                connectionExecutor.execute(() -> {
+                    try {
+                        ensureConnectedBlocking();
+                    } catch (Exception e) {
+                        lastError = compactError(e);
+                        // Ошибка connect/ServerHello сама инвалидирует поколение и планирует reconnect.
+                        // Здесь второй schedule дал бы двойной рост backoff для одной попытки.
+                    }
+                });
+            }, Math.max(0L, delayMs), TimeUnit.MILLISECONDS);
+        }
+
+        private void scheduleReconnect() {
+            if (closed.get() || state == ConnectionState.CLOSED) return;
+            int attempt = reconnectAttempt.getAndUpdate(value -> Math.min(value + 1, 30));
+            reconnectCount.incrementAndGet();
+            ensureConnectedInBackground(reconnectDelayMillis(attempt));
+        }
+
+        private long reconnectDelayMillis(int attempt) {
+            long[] seconds = {1L, 2L, 4L, 8L, 15L, 30L, 60L};
+            long base = seconds[Math.min(Math.max(0, attempt), seconds.length - 1)];
+            long halfMs = TimeUnit.SECONDS.toMillis(base) / 2L;
+            long jitterMs = java.util.concurrent.ThreadLocalRandom.current().nextLong(halfMs + 1L);
+            return halfMs + jitterMs;
+        }
+
+        private void invalidateConnection(String reason, Throwable error) {
+            invalidateConnection(generation.get(), reason, error);
+        }
+
+        private void invalidateConnection(long expectedGeneration, String reason, Throwable error) {
+            if (state == ConnectionState.CLOSED
+                    || !generation.compareAndSet(expectedGeneration, expectedGeneration + 1L)) return;
+            lastError = error == null ? reason : reason + ": " + compactError(error);
+            state = ConnectionState.DISCONNECTED;
+            pingAwaitedSinceMs = 0L;
+            WebSocket ws = webSocket;
+            webSocket = null;
+            if (ws != null) {
+                try { ws.abort(); } catch (Exception ignored) {}
+            }
+            Exception failure = new IllegalStateException("Server connection lost: " + serverLogin + " (" + reason + ")");
+            for (Map.Entry<String, CompletableFuture<JsonNode>> entry : pending.entrySet()) {
+                if (pending.remove(entry.getKey(), entry.getValue())) {
+                    entry.getValue().completeExceptionally(failure);
+                }
+            }
+            scheduleReconnect();
+        }
+
+        private void closeConnection(String reason) {
+            state = ConnectionState.CLOSED;
+            generation.incrementAndGet();
+            WebSocket ws = webSocket;
+            webSocket = null;
+            if (ws != null) {
+                try { ws.sendClose(WebSocket.NORMAL_CLOSURE, reason); } catch (Exception ignored) {}
+                try { ws.abort(); } catch (Exception ignored) {}
+            }
+            IllegalStateException failure = new IllegalStateException("Server connection closed: " + serverLogin);
+            for (CompletableFuture<JsonNode> future : pending.values()) future.completeExceptionally(failure);
+            pending.clear();
+            for (QueuedRequest request : queue) request.result.completeExceptionally(failure);
+            queue.clear();
+            queuedCount.set(0);
+        }
+
+        private PeerMetricsSnapshot snapshot() {
+            int realtime = 0;
+            int normal = 0;
+            int bulk = 0;
+            for (QueuedRequest request : queue) {
+                switch (request.priority) {
+                    case REALTIME -> realtime++;
+                    case NORMAL -> normal++;
+                    case BULK -> bulk++;
+                }
+            }
+            return new PeerMetricsSnapshot(
+                    serverLogin, wsUrl, state, connectedAtMs, lastActivityAtMs,
+                    lastPingAtMs, lastPongAtMs, reconnectCount.get(), realtime, normal, bulk,
+                    successfulRequests.get(), failedRequests.get(), timedOutRequests.get(), lastError);
+        }
+    }
+
+    private record QueuedRequest(
+            Priority priority,
+            long sequence,
+            String jsonTemplate,
+            CompletableFuture<JsonNode> result
+    ) implements Comparable<QueuedRequest> {
+        @Override
+        public int compareTo(QueuedRequest other) {
+            int byPriority = Integer.compare(priority.rank, other.priority.rank);
+            return byPriority != 0 ? byPriority : Long.compare(sequence, other.sequence);
+        }
+    }
+
+    private static final class Listener implements WebSocket.Listener {
+        private final PeerConnection peer;
+        private final long generation;
+        private final StringBuilder text = new StringBuilder();
+
+        private Listener(PeerConnection peer, long generation) {
+            this.peer = peer;
+            this.generation = generation;
+        }
+
+        @Override
+        public void onOpen(WebSocket webSocket) {
+            webSocket.request(1);
+        }
+
+        @Override
+        public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
+            text.append(data);
+            if (last) {
+                peer.acceptText(generation, text.toString());
+                text.setLength(0);
+            }
+            webSocket.request(1);
+            return CompletableFuture.completedFuture(null);
+        }
+
+        @Override
+        public CompletionStage<?> onBinary(WebSocket webSocket, ByteBuffer data, boolean last) {
+            webSocket.request(1);
+            return CompletableFuture.completedFuture(null);
+        }
+
+        @Override
+        public CompletionStage<?> onPong(WebSocket webSocket, ByteBuffer message) {
+            peer.acceptPong(generation);
+            webSocket.request(1);
+            return CompletableFuture.completedFuture(null);
+        }
+
+        @Override
+        public CompletionStage<?> onClose(WebSocket webSocket, int statusCode, String reason) {
+            peer.invalidateConnection(generation, "remote_close_" + statusCode, null);
+            return CompletableFuture.completedFuture(null);
+        }
+
+        @Override
+        public void onError(WebSocket webSocket, Throwable error) {
+            peer.invalidateConnection(generation, "websocket_error", error);
+        }
+    }
+
+    public static String buildWsUrl(String serverAddressRaw) {
+        if (serverAddressRaw == null) return null;
+        String raw = serverAddressRaw.trim();
+        if (raw.isEmpty()) return null;
+        try {
+            String withScheme = raw.matches("^[a-zA-Z]+://.*$") ? raw : "https://" + raw;
+            URI uri = URI.create(withScheme);
+            String host = uri.getHost();
+            if (host == null || host.isBlank()) return null;
+            int port = uri.getPort();
+            String authority = host.trim().toLowerCase(Locale.ROOT) + (port > 0 ? ":" + port : "");
+            return "wss://" + authority + "/ws";
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    private static String loginFromAddress(String serverAddress) {
+        String wsUrl = buildWsUrl(serverAddress);
+        if (wsUrl == null) return null;
+        try {
+            return "address:" + URI.create(wsUrl).getAuthority().toLowerCase(Locale.ROOT);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    private static String normalizeLogin(String value) {
+        if (value == null) return null;
+        String normalized = value.trim().toLowerCase(Locale.ROOT);
+        return normalized.isEmpty() ? null : normalized;
+    }
+
+    private static void ensureOk(String op, JsonNode response) {
+        int status = response == null ? 500 : response.path("status").asInt(500);
+        if (status >= 200 && status < 300) return;
+        String code = response == null ? "EMPTY_RESPONSE" : response.path("code").asText("");
+        if (code.isBlank() && response != null) code = response.path("error").asText("");
+        throw new IllegalStateException(op + " failed: status=" + status + " code=" + code);
+    }
+
+    private static String fillRequestId(String template, String requestIdJson) {
+        int marker = template.indexOf("%s");
+        if (marker < 0) throw new IllegalArgumentException("JSON template has no requestId marker");
+        return template.substring(0, marker) + requestIdJson + template.substring(marker + 2);
+    }
+
+    private static Throwable unwrap(Throwable error) {
+        Throwable current = error;
+        while ((current instanceof java.util.concurrent.CompletionException
+                || current instanceof java.util.concurrent.ExecutionException)
+                && current.getCause() != null) {
+            current = current.getCause();
+        }
+        return current;
+    }
+
+    private static Exception unwrap(Exception error) {
+        Throwable unwrapped = unwrap((Throwable) error);
+        return unwrapped instanceof Exception e ? e : new IllegalStateException(unwrapped);
+    }
+
+    private static String compactError(Throwable error) {
+        String text = String.valueOf(error == null ? "unknown" : error.getMessage());
+        return text.length() <= 500 ? text : text.substring(0, 500);
+    }
+
+    private static long requestTimeoutSeconds() {
+        return configLong("server.pool.requestTimeoutSeconds", 12L, 3L, 120L);
+    }
+
+    private static long connectAndHelloTimeoutSeconds() {
+        return configLong("server.pool.connectTimeoutSeconds", 15L, 5L, 120L);
+    }
+
+    private static long pingIdleSeconds() {
+        return configLong("server.pool.pingIdleSeconds", 120L, 15L, 240L);
+    }
+
+    private static long pongTimeoutSeconds() {
+        return configLong("server.pool.pongTimeoutSeconds", 15L, 5L, 120L);
+    }
+
+    private static long configLong(String key, long defaultValue, long min, long max) {
+        String raw = AppConfig.getInstance().getParam(key);
+        if (raw == null || raw.isBlank()) return defaultValue;
+        try {
+            long value = Long.parseLong(raw.trim());
+            return Math.max(min, Math.min(max, value));
+        } catch (Exception ignored) {
+            return defaultValue;
+        }
+    }
+
+    private static ThreadFactory daemonThreadFactory(String prefix) {
+        return new ThreadFactory() {
+            private final AtomicLong sequence = new AtomicLong();
+            @Override
+            public Thread newThread(Runnable r) {
+                Thread thread = new Thread(r, prefix + "-" + sequence.incrementAndGet());
+                thread.setDaemon(true);
+                return thread;
+            }
+        };
+    }
+}

SHiNE-server/src/main/java/server/sync/BlockchainResyncRecoveryOnStartup.java

@@ -67,7 +67,8 @@ public final class BlockchainResyncRecoveryOnStartup {
                 blockchainName, partnerLogin, partnerAddress);
 
         try {
-            List<RemoteBlockchainSyncClient.RemoteBlockchainHead> heads = REMOTE.listBlockchainHeads(partnerAddress);
+            List<RemoteBlockchainSyncClient.RemoteBlockchainHead> heads =
+                    REMOTE.listBlockchainHeads(partnerLogin, partnerAddress);
             RemoteBlockchainSyncClient.RemoteBlockchainHead remoteHead = heads.stream()
                     .filter(h -> h != null && blockchainName.equals(h.blockchainName()))
                     .findFirst()

SHiNE-server/src/main/java/server/sync/PeriodicBlockchainSyncService.java

@@ -102,7 +102,7 @@ public final class PeriodicBlockchainSyncService {
         if (partnerLogin == null) return;
 
         List<RemoteBlockchainSyncClient.RemoteBlockchainHead> remoteHeads =
-                REMOTE.listBlockchainHeads(partner.getServerAddress());
+                REMOTE.listBlockchainHeads(partner.getLogin(), partner.getServerAddress());
 
         for (RemoteBlockchainSyncClient.RemoteBlockchainHead remoteHead : remoteHeads) {
             if (remoteHead == null || remoteHead.blockchainName() == null || remoteHead.blockchainName().isBlank()) {
@@ -170,7 +170,8 @@ public final class PeriodicBlockchainSyncService {
         int fromBlockNumber = Math.max(localLast + 1, 0);
         for (int blockNumber = fromBlockNumber; blockNumber <= remoteHead.lastBlockNumber(); blockNumber++) {
             RemoteBlockchainSyncClient.RemoteBlockchainBlock remoteBlock =
-                    REMOTE.getBlockchainBlock(partner.getServerAddress(), remoteHead.blockchainName(), blockNumber);
+                    REMOTE.getBlockchainBlock(
+                            partner.getLogin(), partner.getServerAddress(), remoteHead.blockchainName(), blockNumber);
             if (remoteBlock == null) {
                 log.warn("Periodic blockchain sync: remote block not found. partner={} blockchainName={} blockNumber={}",
                         partnerLogin, remoteHead.blockchainName(), blockNumber);
@@ -284,7 +285,8 @@ public final class PeriodicBlockchainSyncService {
             String localPrevHash = "";
             for (int blockNumber = 0; blockNumber <= remoteHead.lastBlockNumber(); blockNumber++) {
                 RemoteBlockchainSyncClient.RemoteBlockchainBlock remoteBlock =
-                        REMOTE.getBlockchainBlock(partner.getServerAddress(), blockchainName, blockNumber);
+                        REMOTE.getBlockchainBlock(
+                                partner.getLogin(), partner.getServerAddress(), blockchainName, blockNumber);
                 if (remoteBlock == null) {
                     log.warn("Blockchain resync: remote block not found. partner={} blockchainName={} blockNumber={}",
                             partnerLogin, blockchainName, blockNumber);

SHiNE-server/src/main/java/server/sync/PeriodicDmSyncService.java

@@ -2,165 +2,52 @@ package server.sync;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import server.logic.ws_protocol.JSON.messages.DmSyncApplySupport;
-import shine.db.dao.DmSyncPeerStateDAO;
-import shine.db.dao.UserAccessServersCurrentDAO;
-import shine.db.entities.DmSyncPeerStateEntry;
-import shine.db.entities.UserAccessServerRouteEntry;
+import shine.db.entities.DmDeliveryStateEntry;
 import utils.config.AppConfig;
 
-import java.util.LinkedHashSet;
-import java.util.List;
-import java.util.Locale;
-import java.util.Set;
+import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 
-/**
- * Периодическая догоняющая синхронизация личной переписки между access-серверами пользователя.
- */
+/** Пятисекундный воркер отвечает только за доставку DM получателю. */
 public final class PeriodicDmSyncService {
     private static final Logger log = LoggerFactory.getLogger(PeriodicDmSyncService.class);
-    private static final String SERVER_LOGIN_CONFIG = "server.SHiNE.login";
     private static final AtomicBoolean STARTED = new AtomicBoolean(false);
-
-    private static final RemoteDmSyncClient REMOTE = new RemoteDmSyncClient();
-    private static final UserAccessServersCurrentDAO ACCESS_DAO = UserAccessServersCurrentDAO.getInstance();
-    private static final DmSyncPeerStateDAO STATE_DAO = DmSyncPeerStateDAO.getInstance();
-
-    private static final ScheduledExecutorService EXECUTOR = Executors.newSingleThreadScheduledExecutor(new ThreadFactory() {
-        @Override
-        public Thread newThread(Runnable r) {
-            Thread t = new Thread(r, "periodic-dm-sync");
-            t.setDaemon(true);
-            return t;
-        }
-    });
+    private static final ScheduledExecutorService SCHEDULER =
+            Executors.newSingleThreadScheduledExecutor(daemonThreadFactory("dm-worker-dispatcher"));
+    private static final ThreadPoolExecutor DELIVERY_EXECUTOR = new ThreadPoolExecutor(
+            4, 4, 0L, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<>(500),
+            daemonThreadFactory("dm-delivery"), new ThreadPoolExecutor.DiscardPolicy());
 
     private PeriodicDmSyncService() {}
 
     public static void startOrLog() {
         if (!isEnabled()) {
-            log.info("Periodic DM sync disabled by dm.sync.enabled=false");
+            log.info("DM delivery worker disabled by dm.sync.enabled=false");
             return;
         }
-        if (!STARTED.compareAndSet(false, true)) {
-            return;
-        }
-        long initialDelaySec = configLong("dm.sync.initialDelaySeconds", 60L, 0L, 3600L);
-        long periodHours = configLong("dm.sync.periodHours", 6L, 1L, 168L);
-        EXECUTOR.scheduleWithFixedDelay(
-                PeriodicDmSyncService::runCycleSafe,
-                initialDelaySec,
-                TimeUnit.HOURS.toSeconds(periodHours),
-                TimeUnit.SECONDS
-        );
-        log.info("Periodic DM sync scheduled: first run in {} seconds, then every {} hours", initialDelaySec, periodHours);
+        if (!STARTED.compareAndSet(false, true)) return;
+        long pollSeconds = configLong("dm.worker.pollSeconds", 5L, 1L, 60L);
+        SCHEDULER.scheduleWithFixedDelay(
+                PeriodicDmSyncService::tickSafe, 0L, pollSeconds, TimeUnit.SECONDS);
+        log.info("DM delivery worker scheduled every {} seconds", pollSeconds);
     }
 
-    private static void runCycleSafe() {
+    private static void tickSafe() {
         try {
-            runCycle();
+            int limit = (int) configLong("dm.worker.dueLimit", 100L, 1L, 1000L);
+            for (DmDeliveryStateEntry row : DmDeliveryCoordinator.listDue(limit)) {
+                DELIVERY_EXECUTOR.execute(() -> DmDeliveryCoordinator.processDueEntry(row));
+            }
         } catch (Exception e) {
-            log.error("Periodic DM sync failed unexpectedly", e);
+            log.error("DM delivery dispatcher failed", e);
         }
     }
 
-    private static void runCycle() throws Exception {
-        String ownServerLogin = normalize(AppConfig.getInstance().getParam(SERVER_LOGIN_CONFIG));
-        if (ownServerLogin == null) {
-            log.warn("Periodic DM sync skipped: {} is empty", SERVER_LOGIN_CONFIG);
-            return;
-        }
-
-        List<String> ownersRaw = ACCESS_DAO.listUserLoginsByServerLogin(ownServerLogin);
-        Set<String> owners = new LinkedHashSet<>(ownersRaw);
-        if (owners.isEmpty()) {
-            log.info("Periodic DM sync skipped: no local access-server users for {}", ownServerLogin);
-            return;
-        }
-
-        int syncedPeers = 0;
-        int appliedEvents = 0;
-        for (String ownerLogin : owners) {
-            List<UserAccessServerRouteEntry> routes = ACCESS_DAO.listByUserLogin(ownerLogin);
-            for (UserAccessServerRouteEntry route : routes) {
-                if (route == null) continue;
-                String remoteLogin = normalize(route.getServerLogin());
-                String remoteUrl = route.getServerUrl();
-                if (remoteLogin == null || remoteUrl == null || remoteUrl.isBlank()) continue;
-                if (remoteLogin.equals(ownServerLogin)) continue;
-
-                try {
-                    appliedEvents += syncOwnerFromRemote(ownerLogin, route);
-                    syncedPeers++;
-                } catch (Exception e) {
-                    STATE_DAO.updateError(ownerLogin, route.getServerLogin(), remoteUrl, String.valueOf(e));
-                    log.warn("Periodic DM sync peer failed: owner={} remoteServer={} reason={}",
-                            ownerLogin, route.getServerLogin(), String.valueOf(e));
-                }
-            }
-        }
-        log.info("Periodic DM sync cycle finished: owners={} syncedPeers={} appliedEvents={}",
-                owners.size(), syncedPeers, appliedEvents);
-    }
-
-    private static int syncOwnerFromRemote(String ownerLogin, UserAccessServerRouteEntry route) throws Exception {
-        int limit = (int) configLong("dm.sync.batchLimit", 500L, 1L, 500L);
-        int maxBytes = (int) configLong("dm.sync.batchMaxBytes", 3_000_000L, 64_000L, 5_000_000L);
-        int maxPages = (int) configLong("dm.sync.maxPagesPerPeer", 50L, 1L, 500L);
-
-        DmSyncPeerStateEntry state = STATE_DAO.getOrCreate(ownerLogin, route.getServerLogin(), route.getServerUrl());
-        long cursorStoredAtMs = state.getCursorStoredAtMs();
-        String cursorMessageKey = state.getCursorMessageKey() == null ? "" : state.getCursorMessageKey();
-        int applied = 0;
-        boolean bootstrapCompleted = false;
-
-        for (int page = 0; page < maxPages; page++) {
-            RemoteDmSyncClient.RemoteDmBatch batch = REMOTE.dmSyncBatch(
-                    route.getServerUrl(),
-                    ownerLogin,
-                    cursorStoredAtMs,
-                    cursorMessageKey,
-                    limit,
-                    maxBytes
-            );
-
-            for (RemoteDmSyncClient.RemoteDmItem item : batch.items()) {
-                if (item == null || item.blobB64() == null || item.blobB64().isBlank()) continue;
-                DmSyncApplySupport.ApplyResult result = DmSyncApplySupport.applySyncedBlob(ownerLogin, item.blobB64());
-                if (result.status().applied()) {
-                    applied++;
-                }
-            }
-
-            cursorStoredAtMs = Math.max(cursorStoredAtMs, batch.nextStoredAtMs());
-            cursorMessageKey = batch.nextMessageKey() == null ? "" : batch.nextMessageKey();
-            bootstrapCompleted = !batch.hasMore();
-            STATE_DAO.updateSuccess(
-                    ownerLogin,
-                    route.getServerLogin(),
-                    route.getServerUrl(),
-                    cursorStoredAtMs,
-                    cursorMessageKey,
-                    bootstrapCompleted
-            );
-
-            if (!batch.hasMore() || batch.items().isEmpty()) {
-                break;
-            }
-        }
-
-        if (!bootstrapCompleted) {
-            log.info("Periodic DM sync peer paused by page limit: owner={} remoteServer={} maxPages={}",
-                    ownerLogin, route.getServerLogin(), maxPages);
-        }
-        return applied;
-    }
-
     private static boolean isEnabled() {
         String raw = AppConfig.getInstance().getParam("dm.sync.enabled");
         return raw == null || raw.isBlank() || Boolean.parseBoolean(raw.trim());
@@ -169,17 +56,18 @@ public final class PeriodicDmSyncService {
     private static long configLong(String key, long defaultValue, long min, long max) {
         String raw = AppConfig.getInstance().getParam(key);
         if (raw == null || raw.isBlank()) return defaultValue;
-        try {
-            long parsed = Long.parseLong(raw.trim());
-            return Math.max(min, Math.min(max, parsed));
-        } catch (Exception ignored) {
-            return defaultValue;
-        }
+        try { return Math.max(min, Math.min(max, Long.parseLong(raw.trim()))); }
+        catch (Exception ignored) { return defaultValue; }
     }
 
-    private static String normalize(String value) {
-        if (value == null) return null;
-        String s = value.trim().toLowerCase(Locale.ROOT);
-        return s.isEmpty() ? null : s;
+    private static ThreadFactory daemonThreadFactory(String prefix) {
+        return new ThreadFactory() {
+            private int sequence;
+            @Override public synchronized Thread newThread(Runnable r) {
+                Thread t = new Thread(r, prefix + "-" + (++sequence));
+                t.setDaemon(true);
+                return t;
+            }
+        };
     }
 }

SHiNE-server/src/main/java/server/sync/PeriodicUserSettingsSyncService.java

@@ -2,6 +2,7 @@ package server.sync;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import server.logic.ws_protocol.JSON.messages.DmSyncApplySupport;
 import shine.db.dao.UserAccessServersCurrentDAO;
 import shine.db.dao.UserSettingsDAO;
 import shine.db.dao.UserSettingsSyncPeerStateDAO;
@@ -14,6 +15,7 @@ import java.sql.Connection;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Locale;
+import java.util.ArrayList;
 import java.util.Set;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
@@ -26,6 +28,7 @@ public final class PeriodicUserSettingsSyncService {
     private static final String SERVER_LOGIN_CONFIG = "server.SHiNE.login";
     private static final AtomicBoolean STARTED = new AtomicBoolean(false);
     private static final RemoteUserSettingsSyncClient REMOTE = new RemoteUserSettingsSyncClient();
+    private static final RemoteDmSyncClient DM_REMOTE = new RemoteDmSyncClient();
     private static final UserAccessServersCurrentDAO ACCESS_DAO = UserAccessServersCurrentDAO.getInstance();
     private static final UserSettingsDAO SETTINGS_DAO = UserSettingsDAO.getInstance();
     private static final UserSettingsSyncPeerStateDAO STATE_DAO = UserSettingsSyncPeerStateDAO.getInstance();
@@ -55,6 +58,9 @@ public final class PeriodicUserSettingsSyncService {
                 TimeUnit.HOURS.toSeconds(periodHours),
                 TimeUnit.SECONDS
         );
+        EXECUTOR.scheduleWithFixedDelay(
+                PeriodicUserSettingsSyncService::runRequestedCycleSafe,
+                5L, 5L, TimeUnit.SECONDS);
         log.info("Periodic user settings sync scheduled: first run in {} seconds, then every {} hours", initialDelaySec, periodHours);
     }
 
@@ -66,6 +72,10 @@ public final class PeriodicUserSettingsSyncService {
         }
     }
 
+    private static void runRequestedCycleSafe() {
+        if (DmSyncWakeSignal.consume()) runCycleSafe();
+    }
+
     private static void runCycle() throws Exception {
         String ownServerLogin = normalize(AppConfig.getInstance().getParam(SERVER_LOGIN_CONFIG));
         if (ownServerLogin == null) {
@@ -83,6 +93,7 @@ public final class PeriodicUserSettingsSyncService {
         int syncedPeers = 0;
         int appliedItems = 0;
         int pushedItems = 0;
+        int appliedDmItems = 0;
         for (String ownerLogin : owners) {
             List<UserAccessServerRouteEntry> routes = ACCESS_DAO.listByUserLogin(ownerLogin);
             for (UserAccessServerRouteEntry route : routes) {
@@ -96,6 +107,7 @@ public final class PeriodicUserSettingsSyncService {
                     SyncStats stats = syncOwnerWithRemote(ownerLogin, route);
                     appliedItems += stats.applied();
                     pushedItems += stats.pushed();
+                    appliedDmItems += stats.appliedDm();
                     syncedPeers++;
                 } catch (Exception e) {
                     STATE_DAO.updateError(ownerLogin, route.getServerLogin(), remoteUrl, String.valueOf(e));
@@ -105,8 +117,8 @@ public final class PeriodicUserSettingsSyncService {
             }
         }
 
-        log.info("Periodic user settings sync cycle finished: owners={} syncedPeers={} appliedItems={} pushedItems={}",
-                owners.size(), syncedPeers, appliedItems, pushedItems);
+        log.info("Periodic access-data sync finished: owners={} peers={} settingsApplied={} settingsPushed={} dmApplied={}",
+                owners.size(), syncedPeers, appliedItems, pushedItems, appliedDmItems);
     }
 
     private static SyncStats syncOwnerWithRemote(String ownerLogin, UserAccessServerRouteEntry route) throws Exception {
@@ -124,9 +136,11 @@ public final class PeriodicUserSettingsSyncService {
         int pushed = 0;
         boolean bootstrapCompleted = false;
 
+        int appliedDm;
+        try (RemoteSyncSession session = new RemoteSyncSession(route.getServerLogin(), route.getServerUrl())) {
         for (int page = 0; page < maxPages; page++) {
             RemoteUserSettingsSyncClient.RemoteUserSettingsBatch batch = REMOTE.userSettingsSyncBatch(
-                    route.getServerUrl(),
+                    session,
                     ownerLogin,
                     cursorTimeMs,
                     cursorSettingKey,
@@ -163,17 +177,53 @@ public final class PeriodicUserSettingsSyncService {
         try (Connection c = getDbConnection()) {
             List<UserSettingEntry> unsynced = SETTINGS_DAO.listUnsyncedByLogin(c, ownerLogin, limit);
             for (UserSettingEntry entry : unsynced) {
-                REMOTE.upsertUserSetting(route.getServerUrl(), entry, true);
+                REMOTE.upsertUserSetting(session, entry, true);
                 SETTINGS_DAO.markSynced(c, entry.getLogin(), entry.getSettingType(), entry.getSettingKey());
                 pushed++;
             }
         }
 
+        int dmLimit = (int) configLong("dm.sync.batchLimit", 200L, 1L, 500L);
+        int dmMaxBytes = (int) configLong("dm.sync.batchMaxBytes", 3_000_000L, 64_000L, 5_000_000L);
+        int dmMaxPages = (int) configLong("dm.sync.maxPagesPerPeer", 20L, 1L, 500L);
+        appliedDm = syncDmInSameSession(session, ownerLogin, dmLimit, dmMaxBytes, dmMaxPages);
+        }
+
         if (!bootstrapCompleted) {
             log.info("Periodic user settings sync peer paused by page limit: owner={} remoteServer={} maxPages={}",
                     ownerLogin, route.getServerLogin(), maxPages);
         }
-        return new SyncStats(applied, pushed);
+        return new SyncStats(applied, pushed, appliedDm);
+    }
+
+    private static int syncDmInSameSession(
+            RemoteSyncSession session, String ownerLogin, int limit, int maxBytes, int maxPages
+    ) throws Exception {
+        long cursorMs = 0L;
+        String cursorKey = "";
+        List<String> acknowledgements = new ArrayList<>();
+        int applied = 0;
+        for (int page = 0; page < maxPages; page++) {
+            RemoteDmSyncClient.RemoteDmBatch batch = DM_REMOTE.dmSyncBatch(
+                    session, ownerLogin, cursorMs, cursorKey, Math.min(limit, 500), maxBytes, acknowledgements);
+            acknowledgements = new ArrayList<>();
+            for (RemoteDmSyncClient.RemoteDmItem item : batch.items()) {
+                if (item == null || item.syncId() == null || item.syncId().isBlank()) continue;
+                DmSyncApplySupport.applySyncedItem(ownerLogin, item.syncId(), item.blobsB64());
+                acknowledgements.add(item.syncId());
+                applied++;
+            }
+            cursorMs = batch.nextStoredAtMs();
+            cursorKey = batch.nextMessageKey() == null ? "" : batch.nextMessageKey();
+            if (!batch.hasMore() || batch.items().isEmpty()) {
+                if (!acknowledgements.isEmpty()) {
+                    DM_REMOTE.dmSyncBatch(session, ownerLogin, 0L, "",
+                            Math.min(limit, 500), maxBytes, acknowledgements);
+                }
+                break;
+            }
+        }
+        return applied;
     }
 
     private static java.sql.Connection getDbConnection() throws Exception {
@@ -202,5 +252,5 @@ public final class PeriodicUserSettingsSyncService {
         return s.isEmpty() ? null : s;
     }
 
-    private record SyncStats(int applied, int pushed) {}
+    private record SyncStats(int applied, int pushed, int appliedDm) {}
 }

SHiNE-server/src/main/java/server/ws/README.md

@@ -83,3 +83,11 @@ WebSocket-эндпоинт для одного соединения.
 
 - `WsServer` = сервер, который слушает порт и вешает `/ws`.
 - `BlockchainWsEndpoint` = обработчик одного WebSocket-подключения, мост между сетью и логикой.
+
+## Постоянные server-to-server соединения
+
+Исходящие межсерверные JSON-запросы проходят через
+`server.sync.ServerConnectionPool`. Пул держит одно постоянное исходящее WSS-
+соединение на `serverLogin`, отправляет `ServerHello`, поддерживает канал через
+WebSocket ping/pong и переподключает его с backoff. DM, settings и blockchain
+используют это соединение с разными приоритетами, не меняя свою бизнес-логику.

SHiNE-server/src/main/java/server/ws/WsServer.java

@@ -12,6 +12,7 @@ import server.sync.PeriodicDmSyncService;
 import server.sync.PeriodicUserSettingsSyncService;
 import server.sync.SolanaUsersSyncStartupService;
 import server.sync.SyncServersBootstrapService;
+import server.sync.ServerConnectionPool;
 import utils.config.AppConfig;
 
 import java.time.Duration;
@@ -104,6 +105,10 @@ public final class WsServer {
 
         server.start();
         log.info("✅ WS сервер запущен на ws://localhost:{}/ws", port);
+        ServerConnectionPool.getInstance().startOrLog();
+        Runtime.getRuntime().addShutdownHook(new Thread(
+                () -> ServerConnectionPool.getInstance().close(),
+                "server-connection-pool-shutdown"));
         PeriodicDmSyncService.startOrLog();
         PeriodicUserSettingsSyncService.startOrLog();
         server.join();

SHiNE-server/src/main/resources/application.properties

@@ -34,13 +34,19 @@ sync.importUserProfileFromPartner.enabled=false
 # ------------------------------------------------------------
 server.version=${projectVersion}
 
-# Межсерверная догоняющая синхронизация личных сообщений.
+# Доставка и межсерверная синхронизация личных сообщений.
 dm.sync.enabled=true
-dm.sync.initialDelaySeconds=60
-dm.sync.periodHours=6
-dm.sync.batchLimit=500
+dm.worker.pollSeconds=5
+dm.worker.dueLimit=100
+dm.sync.batchLimit=200
 dm.sync.batchMaxBytes=3000000
-dm.sync.maxPagesPerPeer=50
+dm.sync.maxPagesPerPeer=20
+server.pool.pingIdleSeconds=120
+server.pool.pongTimeoutSeconds=15
+server.pool.requestTimeoutSeconds=12
+server.pool.connectTimeoutSeconds=15
+server.pool.callerTimeoutSeconds=35
+server.pool.maxQueuePerPeer=2000
 server.info.url=
 server.info.physicalRegion=
 server.info.description=

SHiNE-server/src/test/java/test/it/cases/IT_03_AddBlock_NoAuth.java

@@ -5,6 +5,7 @@ import blockchain.body.ConnectionBody;
 import blockchain.body.CreateChannelBody;
 import blockchain.body.HeaderBody;
 import blockchain.body.TextBody;
+import shine.db.DbController;
 import test.it.blockchain.AddBlockSender;
 import test.it.blockchain.ChainState;
 import test.it.utils.TestConfig;
@@ -13,6 +14,10 @@ import test.it.utils.log.TestResult;
 import test.it.utils.ws.WsSession;
 
 import java.time.Duration;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -117,6 +122,27 @@ public class IT_03_AddBlock_NoAuth {
                 st1.registerTextChannelRoot(newsRootBlock, newsRootHash);
             }
 
+            // CREATE_CHANNEL "Updates" — второй публичный канал того же владельца
+            int updatesRootBlock;
+            byte[] updatesRootHash;
+            {
+                var ln = st1.nextLineByType(ChainState.TYPE_TECH);
+                sender1.send(new CreateChannelBody(
+                        0,
+                        ln.prevLineNumber, ln.prevLineHash32, ln.thisLineNumber,
+                        "Updates",
+                        "",
+                        CreateChannelBody.CHANNEL_TYPE_PUBLIC,
+                        CreateChannelBody.CHANNEL_TYPE_VERSION_DEFAULT
+                ), t);
+
+                updatesRootBlock = st1.lastBlockNumber();
+                updatesRootHash = st1.getHash32(updatesRootBlock);
+                assertNotNull(updatesRootHash);
+
+                st1.registerTextChannelRoot(updatesRootBlock, updatesRootHash);
+            }
+
             // POST #0 в канал "News"
             int newsPost0Block;
             byte[] newsPost0Hash;
@@ -188,16 +214,30 @@ public class IT_03_AddBlock_NoAuth {
                     bch1, newsRootBlock, newsRootHash,
                     "U2 follows U1 channel 'News' (target=U1 CREATE_CHANNEL root)", t);
 
-            // 3) FRIEND взаимно (на HEADER)
-            sendConnection(sender1, st1, MsgSubType.CONNECTION_FRIEND,
+            // 3) U2 подписался на второй канал U1 "Updates"
+            sendConnection(sender2, st2, MsgSubType.CONNECTION_FOLLOW,
+                    bch1, updatesRootBlock, updatesRootHash,
+                    "U2 follows U1 channel 'Updates' (target=U1 CREATE_CHANNEL root)", t);
+
+            assertEquals(2, countConnectionsByOwner(u2, u1),
+                    "U2 должен иметь две отдельные записи подписки на каналы U1");
+            assertEquals(2, countFollowingChannels(u2),
+                    "following_channels_count должен учитывать два разных канала одного владельца");
+            assertEquals(1, countSubscribers(bch1, newsRootBlock, newsRootHash),
+                    "У канала News должен быть 1 подписчик");
+            assertEquals(1, countSubscribers(bch1, updatesRootBlock, updatesRootHash),
+                    "У канала Updates должен быть 1 подписчик");
+
+            // 4) FRIEND взаимно (на HEADER)
+            sendConnection(sender1, st1, MsgSubType.CONNECTION_CLOSE_FRIEND,
                     bch2, u2HeaderBlock, u2HeaderHash,
                     "U1 -> U2: FRIEND", t);
 
-            sendConnection(sender2, st2, MsgSubType.CONNECTION_FRIEND,
+            sendConnection(sender2, st2, MsgSubType.CONNECTION_CLOSE_FRIEND,
                     bch1, u1HeaderBlock, u1HeaderHash,
                     "U2 -> U1: FRIEND", t);
 
-            // 4) CONTACT несколько
+            // 5) CONTACT несколько
             sendConnection(sender1, st1, MsgSubType.CONNECTION_CONTACT,
                     bch2, u2HeaderBlock, u2HeaderHash,
                     "U1 -> U2: CONTACT", t);
@@ -236,7 +276,21 @@ public class IT_03_AddBlock_NoAuth {
                     bch3, u3HeaderBlock, u3HeaderHash,
                     "U1 -> U3: CONTACT", t);
 
-            // 5) U1 убирает U2 из контактов (UNCONTACT)
+            // 6) U2 отписывается только от News
+            sendConnection(sender2, st2, MsgSubType.CONNECTION_UNFOLLOW,
+                    bch1, newsRootBlock, newsRootHash,
+                    "U2 unfollows U1 channel 'News'", t);
+
+            assertEquals(1, countConnectionsByOwner(u2, u1),
+                    "После отписки от одного канала должна остаться одна запись подписки");
+            assertEquals(1, countFollowingChannels(u2),
+                    "following_channels_count должен уменьшиться ровно на 1");
+            assertEquals(0, countSubscribers(bch1, newsRootBlock, newsRootHash),
+                    "После отписки от News у канала должен остаться 0 подписчиков");
+            assertEquals(1, countSubscribers(bch1, updatesRootBlock, updatesRootHash),
+                    "Подписка на Updates должна остаться");
+
+            // 7) U1 убирает U2 из контактов (UNCONTACT)
             sendConnection(sender1, st1, MsgSubType.CONNECTION_UNCONTACT,
                     bch2, u2HeaderBlock, u2HeaderHash,
                     "U1 -> U2: UNCONTACT", t);
@@ -288,4 +342,58 @@ public class IT_03_AddBlock_NoAuth {
                 toBlockHash32
         ), timeout);
     }
+
+    private static int countConnectionsByOwner(String login, String ownerLogin) {
+        return queryInt("""
+                SELECT COUNT(*)
+                FROM connections_state
+                WHERE login = ?
+                  AND rel_type = 30
+                  AND to_login = ?
+                """, login, ownerLogin);
+    }
+
+    private static int countFollowingChannels(String login) {
+        return queryInt("""
+                SELECT following_channels_count
+                FROM user_stats_state
+                WHERE login = ?
+                """, login);
+    }
+
+    private static int countSubscribers(String ownerBlockchainName, int rootBlockNumber, byte[] rootBlockHash) {
+        return queryInt("""
+                SELECT COALESCE(subscribers_count, 0)
+                FROM channel_stats_state
+                WHERE owner_bch_name = ?
+                  AND channel_root_block_number = ?
+                  AND channel_root_block_hash = ?
+                """, ownerBlockchainName, rootBlockNumber, rootBlockHash);
+    }
+
+    private static int queryInt(String sql, Object... params) {
+        try (Connection c = DbController.getInstance().getConnection();
+             PreparedStatement ps = c.prepareStatement(sql)) {
+            for (int i = 0; i < params.length; i++) {
+                Object p = params[i];
+                if (p instanceof String s) {
+                    ps.setString(i + 1, s);
+                } else if (p instanceof Integer n) {
+                    ps.setInt(i + 1, n);
+                } else if (p instanceof byte[] bytes) {
+                    ps.setBytes(i + 1, bytes);
+                } else {
+                    throw new IllegalArgumentException("Unsupported SQL param type: " + (p == null ? "null" : p.getClass()));
+                }
+            }
+            try (ResultSet rs = ps.executeQuery()) {
+                if (!rs.next()) {
+                    throw new IllegalStateException("Query returned no rows: " + sql);
+                }
+                return rs.getInt(1);
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException("DB query failed: " + sql, e);
+        }
+    }
 }

TODO/Arweave/notifications_projection_full_resync.md

@@ -0,0 +1,21 @@
+# TODO: уведомления и full-resync после фиксации блоков в Arweave
+
+## Контекст
+
+`user_notifications_state` является производным индексом blockchain-блоков. Сейчас full-resync цепочки очищает и перестраивает основные derived-state таблицы, но уведомления специально не включены в этот cleanup.
+
+На текущем этапе это **не исправляем**, потому что логика синхронизации ещё будет дорабатываться, а надёжность/финальность блоков планируется усилить записью в Arweave.
+
+## Что проверить после внедрения Arweave
+
+Когда схема Arweave и правила восстановления цепочки стабилизируются:
+
+- определить окончательный source of truth для accepted/finalized blocks;
+- проверить поведение `user_notifications_state` при rollback/full-resync;
+- если цепочка может реально заменить ранее принятый блок, удалять/перестраивать уведомления по `source_bch_name` и фактическому набору финальных блоков;
+- не допускать stale-уведомлений от блоков, которые больше не входят в подтверждённую цепочку;
+- добавить интеграционный тест на divergence + full-resync + notification projection.
+
+## Важно
+
+До появления финальной Arweave/recovery-модели не добавлять временную сложную cleanup-логику только ради этого редкого сценария.

bundle.sh

@@ -0,0 +1,173 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+# Build a source bundle ZIP while excluding credentials, private keys,
+# local state, generated artifacts and other likely secrets.
+#
+# Usage:
+#   ./bundle.sh
+#   ./bundle.sh path/to/output.zip
+#
+# Run from anywhere inside the project; the script resolves its own directory.
+
+ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+cd "$ROOT"
+
+OUT="${1:-SHiNE-bundle-$(date +%Y%m%d-%H%M%S).zip}"
+case "$OUT" in
+  /*) ;;
+  *) OUT="$ROOT/$OUT" ;;
+esac
+
+if ! command -v zip >/dev/null 2>&1; then
+  echo "ERROR: 'zip' is required." >&2
+  exit 1
+fi
+
+TMP="$(mktemp -d)"
+LIST="$TMP/files.txt"
+SAFE_LIST="$TMP/safe-files.txt"
+trap 'rm -rf "$TMP"' EXIT
+
+# Paths / filenames that must never be bundled.
+is_denied_path() {
+  local p="/$1"
+
+  case "$p" in
+    */.git/*|*/.git|\
+    */.gradle/*|*/.gradle|\
+    */.gradle-home/*|*/.gradle-home|\
+    */.idea/*|*/.idea|\
+    */.vscode/*|*/.vscode|\
+    */node_modules/*|*/node_modules|\
+    */target/*|*/target|\
+    */build/*|*/build|\
+    */out/*|*/out|\
+    */bin/*|*/bin|\
+    */logs/*|*/logs|\
+    */data/*|*/data|\
+    */test-ledger/*|*/test-ledger|\
+    */.anchor/*|*/.anchor|\
+    */.yarn/*|*/.yarn|\
+    */.vendor/*|*/.vendor|\
+    */.agents/*|*/.agents|\
+    */.codex/*|*/.codex|\
+    */.claude/*|*/.claude|\
+    */deploy/backup/archive/*|\
+    */scripts/*/runs/*|\
+    */scripts/*/keypairs/*|\
+    */keys/*|\
+    */.git-local-backup/*)
+      return 0
+      ;;
+  esac
+
+  local base="${p##*/}"
+  local lower
+  lower="$(printf '%s' "$base" | tr '[:upper:]' '[:lower:]')"
+
+  case "$lower" in
+    .env|.env.*|\
+    .debug-token|\
+    .npmrc|.pypirc|.netrc|\
+    credentials|credentials.*|\
+    secrets|secrets.*|\
+    secret|secret.*|\
+    id_rsa|id_dsa|id_ecdsa|id_ed25519|\
+    *.pem|*.key|*.p12|*.pfx|*.jks|*.keystore|\
+    *keypair*.json|\
+    service-account*.json|\
+    firebase-adminsdk*.json|\
+    google-services.json|\
+    validator.log)
+      return 0
+      ;;
+  esac
+
+  case "$lower" in
+    *.class|*.jar|*.war|*.ear|*.o|*.a|*.so|*.dll|*.dylib|\
+    *.elf|*.map|*.uf2|*.bin|*.merged.bin|\
+    *.log|*.bak|*.bak.png|*.tmp|*.swp|*.swo|\
+    .ds_store)
+      return 0
+      ;;
+  esac
+
+  return 1
+}
+
+# Collect files. Prefer Git because it naturally avoids most ignored local files.
+if command -v git >/dev/null 2>&1 && git -C "$ROOT" rev-parse --is-inside-work-tree >/dev/null 2>&1; then
+  git -C "$ROOT" ls-files -co --exclude-standard -z > "$TMP/files.z"
+else
+  find "$ROOT" -type f -print0 > "$TMP/files.z"
+fi
+
+# Convert to project-relative paths and enforce hard deny rules.
+: > "$LIST"
+while IFS= read -r -d '' f; do
+  if [[ "$f" = /* ]]; then
+    rel="${f#"$ROOT"/}"
+  else
+    rel="$f"
+  fi
+
+  [[ "$rel" == "$OUT" ]] && continue
+  [[ -z "$rel" ]] && continue
+
+  if is_denied_path "$rel"; then
+    continue
+  fi
+
+  printf '%s\n' "$rel" >> "$LIST"
+done < "$TMP/files.z"
+
+sort -u "$LIST" -o "$LIST"
+
+# Content scan: fail closed on common credential/private-key patterns.
+# We scan only text-ish files; grep -I skips binary data.
+SECRET_RE='-----BEGIN ([A-Z0-9 ]+ )?PRIVATE KEY-----|AKIA[0-9A-Z]{16}|ASIA[0-9A-Z]{16}|gh[pousr]_[A-Za-z0-9_]{20,}|github_pat_[A-Za-z0-9_]{20,}|sk-[A-Za-z0-9_-]{20,}|xox[baprs]-[A-Za-z0-9-]{10,}|AIza[0-9A-Za-z_-]{30,}|(^|[^A-Za-z0-9])(password|passwd|pwd|secret|api[_-]?key|access[_-]?token|auth[_-]?token|private[_-]?key)[[:space:]]*[:=][[:space:]]*["'\'']?[^${[:space:]]{][^[:space:]]{7,}'
+
+: > "$SAFE_LIST"
+found_secret=0
+
+while IFS= read -r rel; do
+  [[ -f "$ROOT/$rel" ]] || continue
+
+  # Files that contain examples/templates can legitimately mention secret keys
+  # with placeholders. They are scanned too, but placeholder-looking values
+  # are less likely to match the regex above.
+  if LC_ALL=C grep -IEnq "$SECRET_RE" "$ROOT/$rel" 2>/dev/null; then
+    echo "BLOCKED: possible secret in $rel" >&2
+    LC_ALL=C grep -IEn "$SECRET_RE" "$ROOT/$rel" 2>/dev/null \
+      | sed -E 's/(:[[:space:]]*).*/\1[REDACTED]/' \
+      | head -n 3 >&2 || true
+    found_secret=1
+    continue
+  fi
+
+  printf '%s\n' "$rel" >> "$SAFE_LIST"
+done < "$LIST"
+
+if (( found_secret != 0 )); then
+  echo >&2
+  echo "Bundle NOT created because possible secrets were detected." >&2
+  echo "Move secrets to ignored/local files or adjust the scanner only after review." >&2
+  exit 2
+fi
+
+if [[ ! -s "$SAFE_LIST" ]]; then
+  echo "ERROR: no files left to bundle." >&2
+  exit 3
+fi
+
+rm -f -- "$OUT"
+
+(
+  cd "$ROOT"
+  zip -q -9 "$OUT" -@ < "$SAFE_LIST"
+)
+
+echo "Created: $OUT"
+echo "Files:   $(wc -l < "$SAFE_LIST" | tr -d ' ')"
+echo "Size:    $(du -h "$OUT" | awk '{print $1}')"

deploy/backup/backup-version.properties

@@ -1,3 +1,3 @@
 backup.schema.version=2
-backup.full.version=3
-last.full.backup.date=2026-08-08
+backup.full.version=4
+last.full.backup.date=2026-08-25

docs/API/01_User_Registration_API.md

@@ -57,7 +57,11 @@
     "serverLastGlobalNumber": 128,
     "serverLastGlobalHash": "4f...ab",
     "serverBlockchainSizeBytes": 45212,
-    "serverBlockchainSizeLimitBytes": 100000
+    "serverBlockchainSizeLimitBytes": 100000,
+    "ownedPublicChannelsCount": 3,
+    "followingUsersCount": 18,
+    "followingChannelsCount": 27,
+    "closeFriendsCount": 4
   }
 }
 ```
@@ -68,6 +72,10 @@
 - `serverLastGlobalHash` — hash последнего блока (hex-строка 64 символа);
 - `serverBlockchainSizeBytes` — текущий размер пользовательского блокчейна на сервере в байтах;
 - `serverBlockchainSizeLimitBytes` — текущий лимит размера блокчейна на сервере в байтах;
+- `ownedPublicChannelsCount` — количество публичных каналов, владельцем которых является пользователь;
+- `followingUsersCount` — количество пользователей, на которых подписан пользователь;
+- `followingChannelsCount` — количество публичных каналов, на которые подписан пользователь;
+- `closeFriendsCount` — количество близких друзей пользователя.
 
 ### Успешный ответ: пользователя нет
 

docs/API/06_Channels_Read_API.md

@@ -23,6 +23,9 @@
 7. `GetGroupDialog` — отдает сообщения конкретного группового чата типа `200`.
 
 > На первом этапе мы **не используем курсоры** (`nextCursor`) и загружаем полные списки.
+>
+> `unreadCount` для канала считается по `user_settings`:
+> если для пары `ownerBlockchainName/channelName` ещё нет записи, канал считается полностью прочитанным, а UI при первом открытии записывает текущий курсор чтения.
 
 ---
 
@@ -155,6 +158,7 @@
       "avaSha256": "0123...",
       "avaSize": 248193,
       "metaUpdatedAtMs": 1760000000000,
+      "subscribersCount": 128,
       "channelRoot": { "blockNumber": 123, "blockHash": "..." }
     },
     "metaEvents": [

docs/API/09_Operations_Index.md

@@ -32,6 +32,7 @@
 | `CloseActiveSession` | `03_Session_Management_API.md` | закрытие активной сессии |
 | `AddBlock` | `04_Add_Block_to_Blockchain_API.md` | добавление блока в блокчейн |
 | `GetBlockchainBlock` | `04_Add_Block_to_Blockchain_API.md` | чтение одного блока блокчейна |
+| `ServerHello` | `16_Server_Connection_Pool_API.md` | объявление server-to-server соединения и возможностей peer без криптографической проверки |
 | `Ping` | `05_Technical_Requests_API.md` | keep-alive |
 | `GetServerInfo` | `05_Technical_Requests_API.md` | публичная информация о сервере |
 | `ListBlockchainHeads` | `05_Technical_Requests_API.md` | список heads всех локальных блокчейнов |
@@ -58,14 +59,16 @@
 | `ListContacts` | `11_Connections_API.md` | контакты текущего пользователя |
 | `GetUserConnectionsGraph` | `11_Connections_API.md` | граф связей пользователя |
 | `AddCloseFriend` | `11_Connections_API.md` | добавить близкого друга |
+| `GetNotifications` | `15_Notifications_API.md` | ответы и события уведомлений |
 | `UpsertPushToken` | `12_Direct_Messages_Push_Calls_API.md` | регистрация WebPush-токена |
 | `SendTestWebPush` | `12_Direct_Messages_Push_Calls_API.md` | тестовая push-доставка |
 | `SendMessagePair` | `12_Direct_Messages_Push_Calls_API.md` | отправка пары входящий/исходящий DM |
-| `ReceiveOutcomingMessage` | `12_Direct_Messages_Push_Calls_API.md` | алиас `SendMessagePair` |
+| `ReceiveOutcomingMessage` | `12_Direct_Messages_Push_Calls_API.md` | старая полная DM-пара для второго access-сервера отправителя |
 | `ReceiveIncomingMessage` | `12_Direct_Messages_Push_Calls_API.md` | прием входящего DM-блока |
 | `DeleteMessage` | `12_Direct_Messages_Push_Calls_API.md` | tombstone одного личного сообщения у обеих сторон |
 | `DeleteConversation` | `12_Direct_Messages_Push_Calls_API.md` | tombstone удаления истории переписки |
-| `DmSyncBatch` | `12_Direct_Messages_Push_Calls_API.md` | межсерверная догоняющая синхронизация DM по курсору |
+| `DmSyncBatch` | `12_Direct_Messages_Push_Calls_API.md` | pull событий `synced=false` с ACK предыдущей страницы |
+| `GetDmDeliveryStatus` | `12_Direct_Messages_Push_Calls_API.md` | read-only статус доставки по существующему `messageKey` |
 | `UserSettingsSyncBatch` | `13_User_Settings_API.md` | межсерверная догоняющая синхронизация пользовательских настроек по курсору |
 | `MarkAllUserSettingsUnsynced` | `13_User_Settings_API.md` | служебная пометка всех настроек как несинхронизированных |
 | `GetDirectMessages` | `12_Direct_Messages_Push_Calls_API.md` | постраничная загрузка истории личного диалога |
@@ -75,7 +78,9 @@
 
 ## Важные замечания
 
-- `ReceiveOutcomingMessage` сейчас зарегистрирован как алиас того же handler/request-класса, что и `SendMessagePair`.
+- `ReceiveOutcomingMessage` зарегистрирован как алиас того же handler/request-класса, что и `SendMessagePair`, и сохраняет прежний межсерверный payload.
+- Межсерверные DM-операции пока доверяют `sourceServerLogin`; отдельная межсерверная авторизация запланирована позднее.
+- `ServerHello` пока принимает заявленный `serverLogin` на доверии и не является криптографической аутентификацией.
 - Отдельных HTTP endpoints для DM-файлов сейчас нет.
 - Классы `Net_MarkChannelMessagesSeen_*` существуют в коде, но операция `MarkChannelMessagesSeen` не зарегистрирована в `JsonHandlerRegistry`, поэтому в публичный список API не входит.
 - HTTP debug endpoints из `src/main/java/server/debug/` не входят в этот индекс WebSocket `op`; они описаны отдельно в `13_HTTP_Debug_API.md`.

docs/API/11_Connections_API.md

@@ -66,11 +66,44 @@
   "ok": true,
   "payload": {
     "login": "Alice",
-    "contacts": ["Bob", "Kate"]
+    "dialogs": [
+      {
+        "peerLogin": "Bob",
+        "relationFlag": "close_friend",
+        "lastMessageBlobB64": "U0hpTkVfRE0B...",
+        "lastMessageTimeMs": 1774700000123,
+        "unreadCount": 2,
+        "hasDialog": true
+      },
+      {
+        "peerLogin": "Kate",
+        "relationFlag": "contact",
+        "lastMessageBlobB64": "",
+        "lastMessageTimeMs": 0,
+        "unreadCount": 0,
+        "hasDialog": false
+      },
+      {
+        "peerLogin": "Mira",
+        "relationFlag": "none",
+        "lastMessageBlobB64": "U0hpTkVfRE0B...",
+        "lastMessageTimeMs": 1774700000555,
+        "unreadCount": 1,
+        "hasDialog": true
+      }
+    ]
   }
 }
 ```
 
+### Примечание
+
+- `dialogs` это серверный inbox-проекционный список диалогов;
+- `relationFlag` возвращается как `close_friend`, `contact` или `none`;
+- если один и тот же человек есть и в `contact`, и в `close_friend`, в `dialogs` он приходит как `close_friend`.
+- `lastMessageBlobB64` содержит полный signed DM block последнего контентного сообщения в base64;
+- для чатов без сообщений поле `lastMessageBlobB64` пустое.
+
 ---
 
 ## 3. `GetUserConnectionsGraph`

docs/API/12_Direct_Messages_Push_Calls_API.md

@@ -11,6 +11,8 @@
 
 - для DM v1 нужно использовать `SendMessagePair`, `ReceiveOutcomingMessage`, `ReceiveIncomingMessage`, `DeleteMessage`, `DeleteConversation`, `GetDirectMessages`;
 - `DmSyncBatch` предназначен для межсерверной догоняющей синхронизации, не для обычного клиентского UI.
+- сервер поддерживает материализованный слой диалогов `dm_dialog_state`; `read receipt` обновляет серверный watermark и `unreadCount`, а не только локальный клиентский флаг.
+- в `dm_dialog_state` сервер также хранит `last_message_blob_b64` для последнего контентного DM в base64, чтобы клиент мог отрисовать список чатов без дополнительного запроса.
 
 ## 1. `UpsertPushToken`
 
@@ -105,12 +107,17 @@
     "baseKey": "from|to|time|nonce",
     "incomingKey": "from|to|time|nonce|1",
     "outgoingKey": "from|to|time|nonce|2",
+    "deliveryState": "accepted",
     "deliveredWsSessions": 1,
     "deliveredWebPushSessions": 0
   }
 }
 ```
 
+Успешный `status=200` подтверждает локальное сохранение. До ответа клиенту сервер параллельно пробует оба актуальных сервера получателя. Поэтому `deliveryState` уже может быть `delivered`; если никто не ответил, возвращается `accepted`.
+
+Возможные `deliveryState`: `accepted`, `delivered`, `failed`.
+
 ### Ошибки
 
 - `400 / BAD_FIELDS` — пустой `incomingBlobB64` или `outgoingBlobB64`
@@ -145,7 +152,15 @@
 }
 ```
 
-`sourceServerLogin` необязателен. Если поле есть, сервер использует его как подсказку, чтобы не отправлять событие обратно серверу-источнику.
+`sourceServerLogin` необязателен для совместимости. Пока межсерверная авторизация отложена, это поле считается доверенным. Пользовательская подпись signed-блока проверяется всегда. Пустой `sourceServerLogin` трактуется как клиентский вызов, непустой - как peer-вызов.
+
+Успешный ответ содержит существующие `messageKey`, `baseKey` и счётчики realtime-доставки. Повтор уже сохранённой той же ревизии обрабатывается идемпотентно.
+
+### Примечание
+
+- входящий `type=3` не только сохраняется как событие прочтения, но и обновляет серверный watermark диалога;
+- если подтверждение прочтения приходит не по порядку, сервер сохраняет наибольший watermark и пересчитывает `unreadCount` по фактическому состоянию сообщений;
+- это нужно, чтобы разные устройства не расходились по счётчику непрочитанных.
 
 ## 5. `DeleteMessage`
 
@@ -235,6 +250,7 @@
         "reencryptedAtMs": 0,
         "createdAtMs": 1774700001123,
         "readAtMs": 1774700001456,
+        "deliveryState": "delivered",
         "blobB64": "BASE64_SIGNED_BLOCK"
       }
     ]
@@ -244,11 +260,50 @@
 
 Для следующей страницы клиент должен передать `nextBeforeTimeMs` и `nextBeforeMessageKey` из предыдущего ответа.
 
-## 8. `DmSyncBatch`
+Поле `deliveryState` заполняется для исходящих элементов `type=2`. У входящих `type=1` оно отсутствует/равно `null`.
 
-Межсерверная операция для догоняющей синхронизации истории одного пользователя. В текущей реализации не требует авторизации сервера-источника, но удалённый сервер отдаёт данные только если сам является access-сервером `ownerLogin` по `user_access_servers_current`.
+## 8. Межсерверные операции DM
 
-### Запрос
+До отдельного этапа server-auth поля `sourceServerLogin` доверяются. Каждый `SHiNE_DM` всё равно заново проходит проверку формата и пользовательской подписи.
+
+### 8.1. `ReceiveOutcomingMessage`
+
+Прежняя операция передачи полной пары второму access-серверу отправителя. Delivery-state в межсерверный запрос не входит.
+
+```json
+{
+  "op": "ReceiveOutcomingMessage",
+  "requestId": "dm-peer-001",
+  "payload": {
+    "incomingBlobB64": "BASE64_INCOMING",
+    "outgoingBlobB64": "BASE64_OUTGOING",
+    "sourceServerLogin": "server-a"
+  }
+}
+```
+
+Ответ имеет прежний формат `SendMessagePair`. Принимающий сервер сохраняет пару идемпотентно и самостоятельно ставит локальную задачу доставки.
+
+### 8.2. `ReceiveIncomingMessage`
+
+Прежняя операция передачи одной входящей копии серверу получателя или второму серверу самого получателя.
+
+```json
+{
+  "op": "ReceiveIncomingMessage",
+  "requestId": "dm-incoming-001",
+  "payload": {
+    "incomingBlobB64": "BASE64_INCOMING",
+    "sourceServerLogin": "server-a"
+  }
+}
+```
+
+Успешный 2xx-ответ означает, что signed-блок проверен и находится в БД (новая или идемпотентно повторённая запись).
+
+### 8.3. `DmSyncBatch`
+
+Pull-синхронизация событий владельца с `synced=false`. `ackSyncIds` подтверждает версии событий, успешно сохранённые из предыдущего ответа.
 
 ```json
 {
@@ -256,55 +311,62 @@
   "requestId": "dm-sync-001",
   "payload": {
     "ownerLogin": "alice",
-    "afterStoredAtMs": 1774700000000,
-    "afterMessageKey": "alice|bob|1774699999000|123456780|2",
+    "afterStoredAtMs": 0,
+    "afterMessageKey": "",
     "limit": 500,
-    "maxBytes": 3000000
+    "maxBytes": 3000000,
+    "ackSyncIds": []
   }
 }
 ```
 
-`afterStoredAtMs` и `afterMessageKey` образуют курсор. Если курсора нет, сервер передаёт `0` и пустую строку. `limit` ограничен максимумом `500`.
-
-### Успешный ответ
+Ответ возвращает страницу несинхронизированных событий и курсор внутри текущего цикла:
 
 ```json
 {
-  "op": "DmSyncBatch",
-  "requestId": "dm-sync-001",
-  "status": 200,
-  "ok": true,
+  "nextStoredAtMs": 1774700001123,
+  "nextMessageKey": "alice|bob|1774700000123|123456789|2",
+  "hasMore": false,
+  "items": [
+    {
+      "syncId": "alice|bob|1774700000123|123456789|2:0:0",
+      "primaryMessageKey": "alice|bob|1774700000123|123456789|2",
+      "storedAtMs": 1774700001123,
+      "blobsB64": ["BASE64_INCOMING", "BASE64_OUTGOING"]
+    }
+  ]
+}
+```
+
+Для пары порядок всегда incoming/outgoing; для входящей копии и tombstone массив содержит один blob. `syncId` — технический идентификатор конкретной ревизии только для ACK синхронизации, а не второй ID сообщения. После сохранения вызывающий сервер передаёт `syncId` в `ackSyncIds` следующего запроса. Только тогда источник ставит `synced=true`. Новый цикл начинается с `afterStoredAtMs=0`; полный сброс флагов поэтому повторно отдаёт всю историю.
+
+### 8.4. `GetDmDeliveryStatus`
+
+Единственная новая межсерверная операция доставки. Read-only проверка существующего `messageKey`; не изменяет состояние отвечающего сервера.
+
+```json
+{
+  "op": "GetDmDeliveryStatus",
+  "requestId": "dm-status-001",
   "payload": {
-    "ownerLogin": "alice",
-    "limit": 500,
-    "rawBytes": 84512,
-    "hasMore": true,
-    "nextStoredAtMs": 1774700100000,
-    "nextMessageKey": "alice|bob|1774700000123|123456789|1",
-    "items": [
-      {
-        "messageKey": "alice|bob|1774700000123|123456789|1",
-        "baseKey": "alice|bob|1774700000123|123456789",
-        "targetLogin": "alice",
-        "fromLogin": "bob",
-        "toLogin": "alice",
-        "messageType": 1,
-        "timeMs": 1774700000123,
-        "storedAtMs": 1774700100000,
-        "blobB64": "BASE64_SIGNED_BLOCK"
-      }
-    ]
+    "messageKey": "alice|bob|1774700000123|123456789|2"
   }
 }
 ```
 
-События в `items` идут по `storedAtMs ASC, messageKey ASC`. В пачке могут быть сообщения любых диалогов пользователя, read-receipt и delete/tombstone типов `5/6/7/8`.
+Ответ содержит `messageKey`, `known` и `delivered`. `delivered=true` означает доставку хотя бы одному серверу получателя.
 
-Ошибки:
+Периодический процесс использует один логический последовательный сеанс поверх
+постоянного WSS-пула: сначала синхронизирует настройки, затем вызывает
+`DmSyncBatch` до завершения страниц и ACK. Существующий
+`MarkAllUserSettingsUnsynced` также сбрасывает DM-флаги и возвращает
+`dmUpdated`; отдельной операции `MarkAllDmUnsynced` нет.
 
-- `400 / EMPTY_OWNER_LOGIN` — не передан `ownerLogin`
-- `403 / LOCAL_SERVER_NOT_ACCESS_SERVER` — этот сервер не является access-сервером пользователя
-- `500 / LOCAL_SERVER_NOT_CONFIGURED` — не настроен `server.SHiNE.login`
+Основные ошибки межсерверных операций:
+
+- `400 / EMPTY_OWNER_LOGIN`, `EMPTY_MESSAGE_KEY`;
+- `403 / LOCAL_SERVER_NOT_ACCESS_SERVER`;
+- `500 / LOCAL_SERVER_NOT_CONFIGURED`.
 
 ## 9. `AckSessionDelivery`
 
@@ -347,6 +409,25 @@
 
 Для типов `5/6/7/8` событие тоже приходит в таком же конверте, но логика применения определяется `messageType` и бинарным `blobB64`.
 
+## 10.1. Событие `DmDeliveryStateChanged`
+
+Сервер отправляет событие активным сессиям отправителя при изменении сетевого состояния исходящей пары.
+
+```json
+{
+  "op": "DmDeliveryStateChanged",
+  "event": true,
+  "status": 200,
+  "payload": {
+    "baseKey": "alice|bob|1774700000123|123456789",
+    "outgoingKey": "alice|bob|1774700000123|123456789|2",
+    "deliveryState": "delivered"
+  }
+}
+```
+
+`failed` приходит после последней неудачной попытки через час. Событие прочтения остаётся отдельным существующим read-receipt.
+
 ## 11. `CallInviteBroadcast`
 
 Требует авторизации. Шлёт приглашение к звонку в активные сессии `toLogin`.
@@ -359,7 +440,7 @@
 
 - все DM-типы `1..8` используют `SHiNE_DM`
 - `GetUser` может lazy-import пользователя из Solana PDA, поэтому именно через него клиент обычно получает `clientKey` адресата для E2EE
-- сервер не расшифровывает DM и не использует ciphertext как preview текста
+- сервер не расшифровывает DM; в списке диалогов он отдаёт последний signed block как `lastMessageBlobB64`, а не извлекает plaintext preview
 - сервер хранит последнюю применённую версию контентного сообщения по правилу `revisionTimeMs`, а при равенстве — по `reencryptedAtMs`
 - если сервер уже знает tombstone удаления переписки и получает старое сообщение до этой границы, он перерассылает известный `DeleteConversation` на `access_servers` обеих сторон
 - HTTP endpoints для DM-файлов сейчас отсутствуют

docs/API/13_User_Settings_API.md

@@ -13,7 +13,8 @@
 - `value_num = number of messages already seen in channel`;
 - `value_text = ''`.
 
-Если настройки нет, канал считается просмотренным до конца, то есть unread = `0`.
+Если настройки нет, канал считается полностью прочитанным, то есть unread = `0`.
+После первого открытия канала UI отправляет текущий курсор, чтобы зафиксировать baseline и дальше считать только новые сообщения.
 
 ## 2. Структура записи
 
@@ -76,15 +77,20 @@
 Внутренний служебный запрос.
 
 - помечает все настройки пользователя или все настройки сразу как `synced=false`;
+- одновременно сбрасывает DM-outbox того же пользователя (или всех пользователей), чтобы операция замены/добавления access-сервера не оставила историю DM несинхронизированной;
+- ответ дополнительно содержит `dmUpdated` — количество сброшенных DM-событий;
 - нужен после добавления нового sync-сервера или при потере локальной БД.
 
 ## 5. Синхронизация
 
-Синхронизация настроек работает отдельно от DM.
+Настройки и DM имеют раздельные таблицы и правила ACK, но периодический процесс
+использует один логический последовательный сеанс поверх постоянного WSS-пула:
+сначала синхронизирует настройки, затем забирает `DmSyncBatch`. Завершение
+логического сеанса не закрывает физический сокет.
 
 - локальная запись создаётся с `synced=false`, если её ещё не подтвердил второй сервер;
 - если запись пришла с другого сервера, она сохраняется сразу как `synced=true`;
-- периодический sync раз в 6 часов проверяет несинхронизированные записи и догружает новые записи по курсору;
+- периодический sync раз в 6 часов проверяет несинхронизированные настройки, догружает их по курсору и затем забирает несинхронизированные DM;
 - если появляется новый sync-сервер или локальная БД была потеряна, нужно пометить все настройки несинхронизированными и заново догрузить batch с нуля.
 
 ## 6. Текущий UI-кейс

docs/API/15_Notifications_API.md

@@ -0,0 +1,81 @@
+# API для разработчиков: уведомления
+
+Документ описывает чтение пользовательских уведомлений, которые сервер индексирует при `AddBlock`.
+
+Текущая операция:
+
+- `GetNotifications`
+
+## 1. `GetNotifications`
+
+Метод читает уведомления текущего пользователя. В `payload.login` можно передать логин явно, но обычно клиент использует авторизованную сессию.
+
+Возвращаются две отдельные ленты:
+
+- `replies` — ответы на сообщения пользователя в каналах и тредах;
+- `events` — события добавления в `close_friend`.
+
+### Запрос
+
+```json
+{
+  "op": "GetNotifications",
+  "requestId": "notif-001",
+  "payload": {
+    "login": "alice",
+    "limit": 50
+  }
+}
+```
+
+### Успешный ответ
+
+```json
+{
+  "op": "GetNotifications",
+  "requestId": "notif-001",
+  "status": 200,
+  "ok": true,
+  "payload": {
+    "login": "Alice",
+    "replies": [
+      {
+        "kind": "reply",
+        "createdAtMs": 1755673200000,
+        "sourceLogin": "Bob",
+        "sourceBlockchainName": "bob-001",
+        "sourceBlockNumber": 42,
+        "sourceBlockHash": "ab12...",
+        "sourceMsgSubType": 20,
+        "sourceText": "Спасибо!",
+        "targetLogin": "Alice",
+        "targetBlockchainName": "alice-001",
+        "targetBlockNumber": 18,
+        "targetBlockHash": "cd34..."
+      }
+    ],
+    "events": [
+      {
+        "kind": "close_friend",
+        "createdAtMs": 1755673300000,
+        "sourceLogin": "Kate",
+        "sourceBlockchainName": "kate-001",
+        "sourceBlockNumber": 7,
+        "sourceBlockHash": "ef56...",
+        "sourceMsgSubType": 10,
+        "sourceText": "close_friend",
+        "targetLogin": "Alice",
+        "targetBlockchainName": "alice-001",
+        "targetBlockNumber": 0,
+        "targetBlockHash": "0000..."
+      }
+    ]
+  }
+}
+```
+
+### Примечание
+
+- `replies` заполняется только для `TEXT_REPLY`.
+- `events` заполняется только для входящего `CONNECTION_FRIEND` / `close_friend`.
+- Другие типы связей в эту ленту не попадают.

docs/API/16_Server_Connection_Pool_API.md

@@ -0,0 +1,105 @@
+# Межсерверное соединение и `ServerHello`
+
+Документ описывает транспортный слой постоянных WSS-соединений между серверами SHiNE.
+Он не меняет форматы DM, блоков, настроек, ACK или расписания повторных попыток.
+
+## 1. `ServerHello`
+
+После установления исходящего WSS-соединения сервер первым запросом отправляет:
+
+```json
+{
+  "op": "ServerHello",
+  "requestId": "server-hello-001",
+  "payload": {
+    "serverLogin": "shineupme",
+    "protocolVersion": 1,
+    "capabilities": [
+      "dm-sync",
+      "settings-sync",
+      "block-sync",
+      "connection-pool"
+    ]
+  }
+}
+```
+
+Успешный ответ:
+
+```json
+{
+  "op": "ServerHello",
+  "requestId": "server-hello-001",
+  "status": 200,
+  "payload": {
+    "accepted": true,
+    "serverLogin": "server2",
+    "protocolVersion": 1,
+    "capabilities": [
+      "dm-sync",
+      "settings-sync",
+      "block-sync",
+      "connection-pool"
+    ]
+  }
+}
+```
+
+На текущем этапе `serverLogin` принимается на доверии. Подпись, challenge и
+проверка корневого ключа сервера намеренно отложены. Поэтому `ServerHello`
+фиксирует тип соединения и возможности peer, но пока не является
+криптографической аутентификацией.
+
+## 2. Пул соединений
+
+- физическое соединение создаётся одно на `serverLogin`;
+- логические операции DM, settings и blockchain используют один WSS;
+- завершение `RemoteSyncSession` не закрывает физический сокет;
+- известные peer берутся из `sync_servers` и `user_access_servers_current`;
+- список перечитывается каждые 30 секунд;
+- при изменении URL соединение пересоздаётся;
+- новые запросы не повторяются транспортом автоматически: действующие
+  domain-воркеры сохраняют прежние правила retry и идемпотентности.
+
+## 3. Приоритеты
+
+| Приоритет | Операции |
+| --- | --- |
+| `REALTIME` | доставка DM, deletes, `GetDmDeliveryStatus` |
+| `NORMAL` | настройки, `DmSyncBatch` и access-data sync |
+| `BULK` | blockchain heads, blocks, `AddBlock` backfill |
+
+На одном peer одновременно исполняется один запрос. Приоритет применяется к
+ожидающей очереди и не прерывает уже начатую операцию.
+
+## 4. Ping, reconnect и таймауты
+
+Значения по умолчанию:
+
+| Параметр | Значение |
+| --- | ---: |
+| `server.pool.pingIdleSeconds` | `120` |
+| `server.pool.pongTimeoutSeconds` | `15` |
+| `server.pool.requestTimeoutSeconds` | `12` |
+| `server.pool.connectTimeoutSeconds` | `15` |
+| `server.pool.callerTimeoutSeconds` | `35` |
+| `server.pool.maxQueuePerPeer` | `2000` |
+
+Ping отправляется WebSocket control-frame только после периода отсутствия
+полезного трафика. При потере соединения применяется reconnect с jitter и
+ступенями до 60 секунд.
+
+## 5. Диагностика
+
+Внутренний snapshot пула хранит для каждого peer:
+
+- состояние соединения;
+- URL;
+- времена connect/activity/ping/pong;
+- число reconnect;
+- размеры очередей по приоритетам;
+- успешные, ошибочные и просроченные запросы;
+- последнюю ошибку.
+
+Агрегированное состояние периодически записывается в серверный лог. Отдельная
+публичная операция метрик на этом этапе не добавляется.

docs/Blockchain/CHANGELOG.md

@@ -1,5 +1,18 @@
 # История изменений документации блокчейна
 
+## 2026-08-25 19:45:18 +0400
+- Базовый коммит-ориентир: `3a58519`.
+- Добавлены runtime-агрегаты статистики:
+  - `user_stats_state` хранит `owned_public_channels_count`, `following_users_count`, `following_channels_count`, `close_friends_count`;
+  - `channel_stats_state` хранит `subscribers_count` для публичных каналов.
+- Обновление статистики выполняется атомарно вместе с записью блока в той же SQL-транзакции `AddBlock`.
+- После полного resync статистика пересобирается из текущих `connections_state` и `channel_names_state`, чтобы старые данные продолжали работать.
+
+## 2026-08-25 19:59:00 +0400
+- Базовый коммит-ориентир: `working tree`.
+- Триггер `channel_names_state` для статистики сделан устойчивым к старым данным, где канал уже есть, а владельца ещё нет в `solana_user_pda_current`.
+- Добавлена совместимая миграция `v15`, чтобы существующие базы перестали падать на старых каналах при старте сервера.
+
 ## 2026-08-12 13:00:00 +0400
 - Базовый коммит-ориентир: `working tree`.
 - Канонический текстовый формат служебных тегов сокращён:

docs/Blockchain/README.md

@@ -42,4 +42,6 @@
 ## Обязательное сопровождение
 - При любом изменении формата/правил блокчейна в коде документы этого каталога обновляются в том же наборе изменений.
 - Обычный `AddBlock` сейчас пишет через `<blockchainName>.tmp_bch`, `<blockchainName>.write_check` и `<blockchainName>.write_pending`; эта схема и `BlockchainTmpRecoveryOnStartup` должны быть описаны в актуальной документации по синхронизации и recovery.
+- Для runtime-агрегатов статистики `user_stats_state` и `channel_stats_state` действует тот же принцип derived state: они обновляются вместе с `AddBlock` и полностью пересобираются при full resync.
+- Если в старых данных есть канал владельца, которого ещё нет в `solana_user_pda_current`, сервер не падает: `channel_stats_state` всё равно обновляется, а `user_stats_state` создаётся только после появления пользователя в Solana PDA.
 - Каждое обновление документов фиксируется в `CHANGELOG.md` с датой/временем и хэшем коммита-основания.

docs/Blockchain/sync-between-servers.md

@@ -32,9 +32,11 @@
 ### 3.1 Личные сообщения (DM)
 
 - Все DM-блоки форматов типов `1/2` (текст) и `3/4` (read-receipt).
-- Сервер-отправитель: при получении пары блоков от клиента перенаправляет их серверу получателя.
-- Сервер-получатель: сохраняет блоки в `signed_messages_v2`, доставляет в активные сессии.
+- Сервер-отправитель: сохраняет пару и ставит асинхронную delivery-задачу.
+- Сервер-получатель: сохраняет входящий блок в `signed_messages`, затем доставляет его активным сессиям.
 - Дедупликация по уникальному `message_key = from|to|timeMs|nonce|type`.
+- Репликация между двумя access-серверами пользователя работает через `dm_sync_outbox.synced`, без постоянного time-cursor.
+- Полная актуальная схема: `docs/Personal_Messages/Доставка_и_синхронизация_DM.md`.
 
 ### 3.2 Блоки пользовательского блокчейна
 
@@ -181,25 +183,32 @@ Full resync запускается только тогда, когда:
 
 Настройка влияет именно на этап подготовки отсутствующей локальной цепочки во время periodic sync.
 
-## 5. Целевой протокол следующего этапа
+## 5. Реализованный постоянный server-to-server транспорт
+
+Этот раздел не меняет текущую семантику DM, settings и blockchain. Он описывает
+единый постоянный WSS-транспорт, через который выполняются уже существующие операции.
 
 ### 5.1 Межсерверное соединение
 
-- Серверы устанавливают постоянное WebSocket-соединение друг с другом.
+- Серверы устанавливают постоянное исходящее WebSocket-соединение друг с другом.
 - Адрес партнёра определяется по `server_address` из его Solana PDA.
-- Аутентификация: подпись Ed25519 корневым ключом сервера (`root_key` из PDA).
-- При разрыве — переподключение с экспоненциальным backoff.
+- После подключения отправляется `ServerHello` с `serverLogin`, версией протокола и capabilities.
+- На текущем этапе `serverLogin` принимается на доверии; подпись Ed25519 корневым ключом сервера отложена.
+- При разрыве выполняется переподключение с jitter/backoff до 60 секунд.
+- После 120 секунд отсутствия полезного трафика отправляется WebSocket ping; pong ожидается 15 секунд.
+- Один физический канал переиспользуют DM, настройки и blockchain.
 
 ### 5.2 Доставка новых данных (push)
 
-- При получении нового блока или DM сервер немедленно пушит его всем подключённым партнёрам.
+- При получении нового блока сервер может немедленно пушить его всем подключённым партнёрам.
 - Партнёр подтверждает приём (ACK). Без ACK — повтор с backoff.
+- DM использует отдельное расписание, описанное в `docs/Personal_Messages/Доставка_и_синхронизация_DM.md`.
 
 ### 5.3 Начальная синхронизация (backfill)
 
-- При первом подключении к партнёру серверы обмениваются «курсорами» состояния:
-  последний глобальный номер блока, последний известный DM-ключ.
+- При первом подключении к партнёру серверы могут обмениваться курсорами состояния блокчейнов.
 - Сервер с более полной историей досылает недостающее партнёру.
+- DM time-cursor удалён: новый peer получает историю после сброса `dm_sync_outbox.synced=false`.
 
 ### 5.4 Разрешение конфликтов
 
@@ -212,19 +221,21 @@ Full resync запускается только тогда, когда:
 При отправке DM от пользователя A к пользователю B:
 
 1. Клиент A отправляет пару блоков на свой сервер X.
-2. Сервер X определяет, на каком сервере зарегистрирован пользователь B.
-   - Сначала проверяет локально (если B зарегистрирован на X).
-   - Иначе читает PDA пользователя B из Solana и смотрит `access_servers`.
-   - Выбирает первый доступный сервер из `access_servers` и перенаправляет туда DM.
-3. Сервер Y (из `access_servers` B) сохраняет и доставляет блоки.
+2. Сервер X валидирует и локально сохраняет пару.
+3. До ответа клиенту X параллельно отправляет входящую копию максимум двум актуальным `access_servers` B.
+4. ACK хотя бы одного маршрута B означает терминальный `delivered`; второй сервер B догоняется собственной DM-синхронизацией.
+5. После первой попытки X передаёт полную пару второму access-серверу A старым `ReceiveOutcomingMessage`, без delivery-state.
+6. При нулевой доставке выполняются повторы через 30 секунд, 5 минут, 25 минут и 1 час. Перед тремя последними X спрашивает peer A через `GetDmDeliveryStatus(messageKey)`.
+7. После неудачной попытки через час ставится терминальный `failed`.
 
-Кэш адресов серверов: обновляется раз в сессию (при ошибке соединения).
+Изменения routing B учитываются до терминального состояния, потому что список маршрутов перечитывается на каждой попытке.
 
 ## 7. Безопасность
 
 - Все блоки подписаны ключами пользователя на клиенте — сервер не может подделать содержимое.
-- Серверы не расшифровывают DM-контент (шифрование — задача следующего этапа).
+- Серверы не расшифровывают DM-контент; E2EE уже выполняется клиентами.
 - При синхронизации каждый блок проходит валидацию подписи на принимающем сервере.
+- Межсерверная авторизация DM-операций пока отложена; `sourceServerLogin` временно считается доверенным.
 
 ## 8. Статус реализации
 
@@ -239,16 +250,21 @@ Full resync запускается только тогда, когда:
 | Плановый blockchain sync при старте + каждые 12 часов | ✅ Реализовано |
 | Обход Solana RPC через `sync.importUserProfileFromPartner.enabled` | ✅ Реализовано |
 | Обычный `AddBlock` через `tmp_bch`/`write_check`/`write_pending` | ✅ Реализовано |
-| Межсерверный постоянный WebSocket-канал | Нужна реализация |
-| Push новых DM партнёрам | Нужна реализация |
-| Push блоков блокчейна партнёрам | ✅ Реализована базовая one-shot версия |
+| Межсерверный постоянный WebSocket-канал | ✅ Реализован общий `ServerConnectionPool` |
+| Асинхронная доставка DM на access-серверы получателя | ✅ Реализовано |
+| Retry DM до 1 часа + UI-state | ✅ Реализовано |
+| Репликация DM на второй access-сервер по `synced` | ✅ Реализовано |
+| Read-only `GetDmDeliveryStatus` | ✅ Реализовано |
+| Push блоков блокчейна партнёрам | ✅ Выполняется через постоянный WSS-пул |
 | Periodic backfill отсутствующего хвоста | ✅ Реализовано |
 | Разрешение рассинхрона / divergence | ✅ Реализована базовая full-resync схема во время periodic sync |
 | Startup recovery по `*.resync_pending` marker-file | ✅ Реализовано |
-| Маршрутизация DM через access_servers | Нужна реализация (заглушка) |
+| Маршрутизация DM через один/два `access_servers` | ✅ Реализовано |
+| Криптографическая server-to-server авторизация DM | Нужна реализация |
 
-Текущая версия сервера уже умеет базовую синхронизацию блокчейнов между партнёрами.
-Не реализованы ещё DM-sync и постоянные server-to-server соединения.
+Текущая версия сервера использует постоянный WSS-пул для существующих
+server-to-server JSON-операций. Отдельной будущей задачей остаётся
+криптографическая авторизация server-to-server вызовов.
 
 Следующие отдельные шаги после текущего этапа:
 - отдельно проверить full-resync и startup-recovery на реальном тестовом прогоне после ручного удаления БД/файлов.

docs/Personal_Messages/README.md

@@ -6,6 +6,7 @@
 
 - `docs/Personal_Messages/Протокол_DM_v1.md` — логика протокола, роли API, серверное поведение, routing по `access_servers`
 - `docs/Personal_Messages/Формат_DM_v1.md` — точный бинарный формат контейнера `SHiNE_DM`
+- `docs/Personal_Messages/Доставка_и_синхронизация_DM.md` — состояния доставки, retry-воркер, репликация между двумя access-серверами и UI-статусы
 - `docs/Personal_Messages/Технические_вставки_DM_v1.md` — формат специальных `<S:...>` вставок внутри plaintext DM после расшифровки
 
 Исторический устаревший документ сохранён отдельно:

docs/Personal_Messages/Доставка_и_синхронизация_DM.md

@@ -0,0 +1,138 @@
+# Доставка и синхронизация личных сообщений
+
+## 1. Главный принцип
+
+DM считается доставленным, когда signed-входящую копию сохранил хотя бы один актуальный access-сервер получателя. Доставка на оба сервера не требуется: сервер получателя самостоятельно синхронизирует входящее сообщение со своим вторым сервером.
+
+Клиентский `status=200` от `SendMessagePair` означает, что собственный сервер сохранил пару. Это отдельный факт от доставки получателю.
+
+Формат подписанного контейнера `SHiNE_DM` не меняется. Состояние доставки и флаг синхронизации — изменяемые серверные метаданные.
+
+## 2. Идентификаторы
+
+- `baseKey` связывает входящую и исходящую копии одного логического сообщения;
+- `incomingKey` идентифицирует копию получателя;
+- `outgoingKey`/`messageKey` идентифицирует копию отправителя и используется для проверки доставки;
+- дополнительный публичный `eventId` для доставки не создаётся;
+- `syncId` используется только внутри `DmSyncBatch` как ACK конкретной ревизии, потому что редактирование сохраняет прежний `messageKey`.
+
+## 3. Состояния доставки
+
+| Состояние | Смысл | Повторные попытки |
+|---|---|---|
+| `accepted` | пара сохранена сервером отправителя, но ни один сервер получателя ещё не подтвердил запись | да |
+| `delivered` | хотя бы один сервер получателя подтвердил запись | нет |
+| `failed` | последняя попытка через час завершилась без доставки | никогда |
+
+Состояние `delivered` терминальное. Сервер отправителя не пытается отдельно добиться второго ACK получателя.
+
+## 4. Обычная отправка
+
+1. Клиент отправляет `SendMessagePair` на один свой access-сервер.
+2. Сервер проверяет формат, пользователей, подписи и согласованность пары.
+3. Сервер атомарно сохраняет входящую и исходящую копии.
+4. В том же request-процессе сервер читает до двух актуальных маршрутов получателя.
+5. Оба вызова `ReceiveIncomingMessage` запускаются параллельно.
+6. Если хотя бы один вызов успешен, устанавливается `delivered`.
+7. После этой попытки сервер передаёт полную пару своему второму access-серверу старой операцией `ReceiveOutcomingMessage`.
+8. `SendMessagePair` возвращает существующие ключи и единственное новое поле `deliveryState`.
+
+Успешный повтор уже сохранённого signed-блока считается ACK. Все операции должны быть идемпотентными.
+
+## 5. Расписание повторов
+
+Воркер запускается каждые 5 секунд и выбирает только due-строки по индексу. Он не сканирует всю таблицу сообщений.
+
+Попытки привязаны к времени первоначального принятия:
+
+| Номер | Время от старта | Сначала спросить второй сервер отправителя |
+|---:|---:|---|
+| 1 | сразу | нет |
+| 2 | 30 секунд | нет |
+| 3 | 5 минут | да |
+| 4 | 25 минут | да |
+| 5 | 1 час | да |
+
+Из-за шага воркера повтор может начаться на несколько секунд позже указанного времени. Первая попытка выполняется немедленно и от воркера не зависит.
+
+На 5-й, 25-й и 60-й минутах сервер сначала вызывает у второго сервера отправителя:
+
+```json
+{
+  "op": "GetDmDeliveryStatus",
+  "payload": {
+    "messageKey": "alice|bob|1774700000123|123456789|2"
+  }
+}
+```
+
+Ответ:
+
+```json
+{
+  "messageKey": "alice|bob|1774700000123|123456789|2",
+  "known": true,
+  "delivered": true
+}
+```
+
+Операция read-only. Если peer отвечает `delivered=true`, локальный сервер устанавливает `delivered` и не обращается к серверам получателя. Ошибка или отсутствие операции на старом peer не блокирует собственную попытку.
+
+Перед каждой попыткой маршруты получателя заново читаются из `user_access_servers_current`. Изменение серверов учитывается только пока сообщение находится в `accepted`. После `delivered` или `failed` состояние больше не открывается.
+
+Если последняя проверка и попытка через час не дали ACK, устанавливается `failed`, `next_attempt_at_ms` очищается и сообщение больше никогда автоматически не отправляется.
+
+## 6. Старая межсерверная доставка
+
+Форматы существующих операций не расширяются данными о результате доставки:
+
+- `ReceiveOutcomingMessage` получает прежнюю пару `incomingBlobB64` + `outgoingBlobB64` и необязательный `sourceServerLogin`;
+- `ReceiveIncomingMessage` получает один `incomingBlobB64` и необязательный `sourceServerLogin`.
+
+Второй сервер отправителя после получения пары создаёт собственное локальное состояние доставки и самостоятельно пробует маршруты получателя. Серверы обмениваются результатом только через read-only `GetDmDeliveryStatus`.
+
+## 7. Догоняющая синхронизация двух серверов пользователя
+
+Для каждого владельца сервер ведёт outbox с флагом `synced`:
+
+- исходящая пара отправителя — один элемент с двумя blob в порядке incoming/outgoing;
+- входящая копия получателя — один элемент с одним blob;
+- read-receipt и tombstone применяются теми же проверенными обработчиками.
+
+`DmSyncBatch` возвращает только элементы с `synced=false`. Получатель проверяет signed-блоки, сохраняет их идемпотентно и в следующем запросе подтверждает `syncId` через `ackSyncIds`. Источник ставит `synced=true` только после ACK.
+
+При обрыве соединения неподтверждённый элемент остаётся `synced=false` и безопасно приходит повторно. Элемент, полученный от peer, локально сразу считается синхронизированным, чтобы не образовалась петля.
+
+`sourceServerLogin` является единственным признаком межсерверного вызова для этих операций: если поле пустое, запрос считается клиентским и его запись не должна сразу переводиться в `synced=true`.
+
+Синхронизация настроек и DM проходит последовательно через один WS-сеанс: сначала настройки, затем все страницы DM. Если второй сервер был выключен, после включения он сам догружает пропущенные элементы.
+
+Существующий `MarkAllUserSettingsUnsynced` также сбрасывает DM-флаги. После сброса история повторно передаётся как синхронизация, но старые сообщения получателю заново не отправляются: delivery-состояние создаётся с учётом их возраста и не открывает завершённую часовую очередь.
+
+## 8. UI
+
+| Вид | Значение |
+|---|---|
+| одна серая галочка | собственный сервер принял сообщение (`accepted`) |
+| одна светлая галочка | хотя бы один сервер получателя принял сообщение (`delivered`) |
+| две светлые галочки | пришёл существующий read-receipt |
+| красный `!` и «Сообщение не доставлено» | окончательное состояние `failed` |
+
+Read-receipt имеет приоритет над delivery-индикатором: если сообщение прочитано, оно заведомо было доставлено.
+
+Сервер сообщает поздние изменения через `DmDeliveryStateChanged` с полями `outgoingKey`, `baseKey`, `deliveryState`. При повторном открытии чата то же состояние приходит в `GetDirectMessages`.
+
+## 9. Нагрузка и отказоустойчивость
+
+- воркер выбирает только due-записи по частичному индексу;
+- терминальные строки не попадают в рабочую выборку;
+- два маршрута первой попытки выполняются параллельно;
+- ограниченный пул потоков и очередь защищают сервер при всплеске отправок;
+- сетевой lease и сравнение версии строки предотвращают одновременную обработку одной задачи несколькими worker-потоками;
+- повторная запись одного signed-блока безопасна;
+- отсутствие второго сервера отправителя не мешает собственной доставке;
+- отсутствие обоих серверов получателя завершает задачу через час.
+
+## 10. Граница доверия
+
+Межсерверная авторизация пока отложена. `sourceServerLogin` временно принимается на доверии, но каждый контейнер `SHiNE_DM` всё равно проходит проверку пользовательской подписи. `GetDmDeliveryStatus` сообщает только факт локального delivery-state и не изменяет данные.

docs/Personal_Messages/Протокол_DM_v1.md

@@ -26,6 +26,10 @@
 
 - `docs/Personal_Messages/Технические_вставки_DM_v1.md`
 
+Изменяемое состояние доставки, retry-расписание и репликация между двумя access-серверами подробно описаны отдельно:
+
+- `docs/Personal_Messages/Доставка_и_синхронизация_DM.md`
+
 Устаревшая предыдущая версия сохранена отдельно:
 
 - `docs/Personal_Messages/Спецификация_DM_v0.5_устаревшая.md`
@@ -300,12 +304,17 @@
 
 `sync_servers` не являются списком пользовательских серверов доставки DM.
 
-### 7.3. Несколько серверов у отправителя и получателя
+### 7.3. Два сервера у отправителя и получателя
 
-Протокол должен поддерживать ситуацию, когда:
+Актуальный runtime исходит из ограничения:
 
-- у отправителя несколько `access_servers`;
-- у получателя несколько `access_servers`;
+- у одного пользователя не более двух `access_servers`;
+- следовательно, у локального сервера есть не более одного peer для репликации данных пользователя.
+
+Протокол поддерживает ситуацию, когда:
+
+- у отправителя один или два `access_servers`;
+- у получателя один или два `access_servers`;
 - часть серверов у сторон совпадает;
 - часть серверов уникальна.
 
@@ -332,7 +341,33 @@
 - `ReceiveIncomingMessage` — приём одной входящей копии, входящих редактирований и входящего read-receipt;
 - `ReceiveOutcomingMessage` — алиас `SendMessagePair`.
 
-### 8.2. Новые методы, которые нужны
+### 8.2. Межсерверная синхронизация
+
+- `ReceiveOutcomingMessage` — прежняя полная пара второго access-сервера отправителя;
+- `ReceiveIncomingMessage` — прежняя одиночная входящая копия;
+- `DmSyncBatch` — pull событий с `synced=false` и ACK сохранённой предыдущей страницы;
+- `GetDmDeliveryStatus` — единственная новая read-only проверка доставки по существующему `messageKey`.
+
+Delivery-state между серверами не передаётся и не объединяется.
+
+### 8.3. Серверный слой диалогов
+
+Помимо хранения самих DM-сообщений сервер поддерживает материализованный слой состояния диалогов:
+
+- отдельная запись на пару `owner_login` + `peer_login`;
+- `relation_flag` со значениями `close_friend`, `contact`, `none`;
+- `last_message_blob_b64` как последний контентный signed DM block в base64;
+- `last_message_time_ms`;
+- `unread_count`;
+- `last_read_receipt_time_ms` как watermark последнего подтверждения прочтения.
+
+Ключевые правила:
+
+- `close_friend` всегда имеет приоритет над `contact`;
+- если `read receipt` приходит не по порядку, сервер хранит наибольший watermark и не откатывает состояние назад;
+- `unread_count` пересчитывается сервером по сообщениям диалога с учётом watermark и `read_at_ms`;
+- старые исторические данные восстанавливаются из `signed_messages` при инициализации/миграции;
+- UI не должен собирать inbox только из локального кеша, когда ему доступен серверный список диалогов.
 
 ## 9. Правила валидации и применения
 
@@ -427,8 +462,12 @@ Request:
 Правила:
 
 - клиенту достаточно отправить пару на один любой доступный сервер;
+- успешный `status=200` означает локальное сохранение;
+- первая сетевая попытка выполняется до ответа клиенту, параллельно для двух серверов получателя;
 - сервер после принятия сам отвечает за дальнейшую межсерверную доставку.
 
+Ответ сохраняет прежние `baseKey`, `incomingKey`, `outgoingKey` и счётчики доставки в клиентские сессии. Единственное новое поле — `deliveryState`: `accepted`, `delivered` или `failed`.
+
 ### 10.2. `ReceiveIncomingMessage`
 
 Назначение:
@@ -450,7 +489,7 @@ Request:
 }
 ```
 
-`sourceServerLogin` необязателен и используется как best-effort подсказка, чтобы сервер при дальнейшей пересылке не отправлял то же событие обратно серверу-источнику.
+`sourceServerLogin` пока доверяется без отдельной межсерверной подписи. Сервер всё равно проверяет пользовательскую подпись самого `SHiNE_DM`. Для `ReceiveOutcomingMessage` и `SendMessagePair` пустой `sourceServerLogin` означает клиентский вызов, непустой - peer-вызов. Успешный ответ сохраняет старые поля `messageKey`, `baseKey` и счётчики realtime-доставки.
 
 ### 10.3. `DeleteMessage`
 
@@ -539,6 +578,8 @@ UI-следствие для клиента:
 - если точное время для старого сообщения неизвестно, но по более новым данным видно, что сообщение уже точно прочитано, UI может показывать его как прочитанное без точного времени;
 - read-receipt при этом остаётся отдельным DM-событием синхронизации, но в обычную историю страницы не подмешивается.
 
+Для исходящих элементов сервер также возвращает единственное поле `deliveryState`.
+
 ## 11. Межсерверная доставка
 
 ### 11.1. Клиентская сторона
@@ -549,47 +590,23 @@ UI-следствие для клиента:
 
 ### 11.2. Серверная сторона
 
-После принятия валидного события сервер должен отправлять его:
+После локального принятия пара получает изменяемое состояние `accepted`. Сервер сразу вызывает до двух текущих маршрутов получателя параллельно. Успех хотя бы одного маршрута переводит сообщение в терминальное `delivered`; ждать второй маршрут не требуется.
 
-- на все серверы из `access_servers` отправителя;
-- на все серверы из `access_servers` получателя.
+После первой попытки полная пара передаётся единственному второму access-серверу отправителя через прежний `ReceiveOutcomingMessage`. Peer самостоятельно пробует актуальные маршруты получателя; delivery-state в запрос не входит.
 
-Если часть серверов совпадает, это допустимо.
-
-Если один и тот же сервер присутствует у обеих сторон, он не должен слать сообщение сам себе повторно, но обязан локально сохранить событие и доставить его в нужные пользовательские сессии.
-
-Идемпотентность обязательна.
+Идемпотентность обязательна. ACK означает запись в БД; повтор уже известной ревизии считается успешным ACK.
 
 ### 11.3. Догоняющая синхронизация истории
 
-Для восстановления пропущенных DM-событий между access-серверами используется отдельная операция:
+Для восстановления пропущенных DM-событий между access-серверами используется pull-операция:
 
 - `DmSyncBatch`
 
-Сервер-получатель синхронизации запрашивает у другого access-сервера историю одного пользователя по курсору:
+Второй сервер запрашивает outbox-события владельца с `synced=false`, сохраняет их и передаёт подтверждённые `syncId` в `ackSyncIds` следующего запроса. Источник ставит `synced=true` только после ACK. Каждый цикл начинается с начала списка; курсор нужен только для страниц текущего цикла.
 
-- `ownerLogin`;
-- `afterStoredAtMs`;
-- `afterMessageKey`;
-- `limit`, максимум `500`;
-- `maxBytes`, ограничение суммарного размера raw-блоков пачки.
+Полная пара отправителя передаётся двумя blob. Входящая копия получателя и tombstone передаются одним blob.
 
-Удалённый сервер отдаёт все DM-события, относящиеся к этому пользователю:
-
-- контентные копии и read-receipt по `target_login`;
-- tombstone типов `5/6/7/8`, где пользователь участвует как `fromLogin` или `toLogin`.
-
-Порядок пачки:
-
-- `created_at_ms ASC`;
-- `message_key ASC`.
-
-Курсор хранится локально для пары:
-
-- пользователь;
-- удалённый access-сервер.
-
-При первом добавлении сервера или отсутствии курсора синхронизация стартует с `0` и постепенно подтягивает всю доступную историю пачками.
+Полная пара отправителя передаётся одним элементом с двумя blob в порядке incoming/outgoing. Входящая копия получателя и tombstone передаются одним blob.
 
 При применении событий, полученных через `DmSyncBatch`, сервер:
 
@@ -599,17 +616,20 @@ UI-следствие для клиента:
 - не отправляет realtime/push-уведомления клиентам;
 - не запускает повторный fan-out, чтобы не создавать циклы.
 
-Плановый sync запускается фоном после старта WebSocket-сервера и повторяется раз в 6 часов.
+Синхронизация настроек и DM выполняется одним периодическим процессом и через
+один логический последовательный сеанс поверх постоянного WSS-пула. Закрытие
+этого логического сеанса не закрывает физическое соединение с peer. Выборка DM
+использует частичный индекс по `synced=false`.
 
-В текущей реализации межсерверная авторизация для `DmSyncBatch` ещё не включена. Сервер отдаёт пачку только если сам локально является access-сервером `ownerLogin` по актуальной таблице `user_access_servers_current`.
+В текущей реализации межсерверная авторизация DM ещё не включена. Принимающий сервер проверяет, что сам является access-сервером `ownerLogin`, и всегда проверяет пользовательские подписи signed-блоков.
 
 ### 11.4. Ошибки доставки
 
-Если часть серверов временно недоступна:
+Если ни один сервер получателя не подтвердил запись, попытки выполняются сразу, через 30 секунд, 5 минут, 25 минут и 1 час от первоначального принятия.
 
-- это не должно отменять локальное принятие уже валидного сообщения;
-- повторная доставка может делаться отдельным retry-механизмом;
-- повторное получение того же события должно быть безопасным.
+Перед попытками через 5 минут, 25 минут и час сервер read-only спрашивает peer отправителя через `GetDmDeliveryStatus(messageKey)`. Если peer уже доставил хотя бы на один сервер, сообщение считается доставленным.
+
+После неудачной последней попытки устанавливается `failed`; дальнейших автоматических попыток и кнопки ручного повтора нет.
 
 ## 12. Хранение в БД
 
@@ -634,11 +654,13 @@ UI-следствие для клиента:
 
 Сообщение об удалении переписки тоже хранится в БД, а старые сообщения до его времени из БД удаляются.
 
-Для догоняющей межсерверной синхронизации дополнительно используются:
+Изменяемая сетевая часть хранится отдельно:
 
-- индекс по `target_login`, `created_at_ms`, `message_key`;
-- отдельные индексы по delete-событиям для `from_login` и `to_login`;
-- таблица `dm_sync_peer_state` с курсором чтения для пары `ownerLogin + remoteServerLogin`.
+- `dm_delivery_state` — состояние и расписание доставки исходящей пары;
+- `dm_sync_outbox` — событие владельца и единственный флаг ACK `synced`;
+- частичные индексы содержат только due/unsynced строки.
+
+Legacy-таблица `dm_sync_peer_state` после миграции v12 физически остаётся для безопасной установки ZIP-накладки, но новым DM-кодом не используется.
 
 ## 13. Что обязательно должно измениться в коде относительно v0.5
 
@@ -651,7 +673,7 @@ UI-следствие для клиента:
 - межсерверная маршрутизация DM должна идти через `access_servers`;
 - сервер должен добирать отсутствующих пользователей из Solana PDA до проверки подписи DM;
 - при выборе актуальной версии должен учитываться `reencryptedAtMs`, если `revisionTimeMs` совпадает;
-- логика должна быть безопасна для нескольких серверов у каждой стороны.
+- логика должна быть безопасна для одного или двух серверов у каждой стороны.
 
 ## 14. Что в v1 пока не входит
 
@@ -659,4 +681,4 @@ UI-следствие для клиента:
 - хранение отдельного `keyId` шифрования в DM;
 - ротация `clientKey`;
 - финальная конкретная UI-реализация массовой перешифровки;
-- межсерверная авторизация `DmSyncBatch`.
+- межсерверная авторизация DM-синхронизации и доставки.

docs/Personal_Messages/Формат_DM_v1.md

@@ -13,6 +13,9 @@
 Логика протокола, API и поведение сервера описаны отдельно:
 
 - `docs/Personal_Messages/Протокол_DM_v1.md`
+- `docs/Personal_Messages/Доставка_и_синхронизация_DM.md`
+
+`deliveryState`, retry-времена и sync-флаг не входят в `SHiNE_DM` и не подписываются пользователем. Это изменяемые серверные метаданные, хранящиеся отдельно от raw-контейнера. Для корреляции доставки используется уже существующий `messageKey`; добавление delivery-воркера не меняет ни одного байта формата ниже.
 
 ## 1. Общие правила
 
@@ -252,6 +255,15 @@ ReadReceiptBody_v1_0
 
 Различается только `messageType` и формат `body`.
 
+### Серверное примечание
+
+Внешний байтовый формат `type=3/4` не меняется, но сервер использует такие контейнеры как вход для обновления `dm_dialog_state`:
+
+- `read receipt` обновляет серверный watermark диалога;
+- `unreadCount` пересчитывается на сервере, а не только на клиенте;
+- если подтверждение прочтения приходит в другом порядке, сервер сохраняет максимальный watermark и не откатывает счётчик назад.
+- в списке диалогов сервер может отдавать последний signed block как `lastMessageBlobB64` без попытки извлечь plaintext preview.
+
 ## 9. Контент типов `5/6`
 
 Типы:
@@ -328,4 +340,4 @@ ReadReceiptBody_v1_0
 
 В версии DM v1 все типы `1..8` используют единый контейнер `SHiNE_DM`.
 
-Межсерверная операция `DmSyncBatch` не вводит новый байтовый формат DM. Она передаёт уже сохранённые raw-контейнеры `SHiNE_DM` в Base64 вместе с серверными метаданными курсора (`storedAtMs`, `messageKey`), а принимающий сервер заново проверяет подпись и применяет тот же контейнер по его `messageType`.
+Межсерверные операции `ReceiveOutcomingMessage`, `ReceiveIncomingMessage` и `DmSyncBatch` не вводят новый байтовый формат DM. Они передают уже сохранённые raw-контейнеры `SHiNE_DM` в Base64. `ackSyncIds` подтверждает только факт сохранения синхронизированной ревизии; delivery-state между серверами не передаётся. Принимающий сервер заново проверяет подпись и применяет контейнер по его `messageType`.

shine-UI/index.html

@@ -12,13 +12,13 @@
     <link rel="apple-touch-icon" href="./img/logo.jpg" />
     <title>СИЯНИЕ</title>
     <script>
-window.__SHINE_BUILD_HASH__ = '20260819190000';
+window.__SHINE_BUILD_HASH__ = '20260822140000';
       window.__SHINE_CLIENT_VERSION__ = '1.2.10';
     </script>
     <script>
       (function attachStylesWithBuildHash() {
         const v = encodeURIComponent(window.__SHINE_BUILD_HASH__ || 'dev');
-        const cssFiles = ['./styles/main.css', './styles/layout.css', './styles/components.css', './styles/network-graph.css'];
+        const cssFiles = ['./styles/main.css', './styles/layout.css', './styles/components.css', './styles/network-graph.css', './styles/buttons-white.css'];
         cssFiles.forEach((file) => {
           const link = document.createElement('link');
           link.rel = 'stylesheet';
@@ -52,8 +52,284 @@ window.__SHINE_BUILD_HASH__ = '20260819190000';
     </script>
     <script>
       (function attachBootErrorOverlay() {
-        const show = (title, text) => {
+        const stateKey = '__SHINE_BOOT_ERROR_STATE__';
+        const menuId = 'boot-error-action-sheet';
+        const escapeText = (value) => String(value == null ? '' : value)
+          .replace(/&/g, '&amp;')
+          .replace(/</g, '&lt;')
+          .replace(/>/g, '&gt;')
+          .replace(/"/g, '&quot;');
+        const safeString = (value, maxLen = 1000) => {
+          const text = String(value == null ? '' : value).trim();
+          if (text.length <= maxLen) return text;
+          return `${text.slice(0, Math.max(0, maxLen - 3))}...`;
+        };
+        const setState = (next) => {
           try {
+            window[stateKey] = next;
+          } catch {}
+        };
+        const getState = () => {
+          try {
+            return window[stateKey] || null;
+          } catch {
+            return null;
+          }
+        };
+        const getKnownClientError = () => {
+          try {
+            return typeof window.__SHINE_GET_LAST_CLIENT_ERROR__ === 'function'
+              ? window.__SHINE_GET_LAST_CLIENT_ERROR__()
+              : null;
+          } catch {
+            return null;
+          }
+        };
+        const showFeedback = (message, kind = 'success') => {
+          try {
+            if (typeof window.__SHINE_SHOW_TOAST__ === 'function') {
+              window.__SHINE_SHOW_TOAST__(message, kind);
+            } else {
+              console.info(message);
+            }
+          } catch {}
+        };
+        const buildReport = () => {
+          const state = getState() || {};
+          const known = getKnownClientError();
+          const viewport = {
+            width: Math.round(window.innerWidth || 0),
+            height: Math.round(window.innerHeight || 0),
+            dpr: Number(window.devicePixelRatio || 1),
+            visualWidth: Math.round(window.visualViewport?.width || 0),
+            visualHeight: Math.round(window.visualViewport?.height || 0),
+            visualScale: Number(window.visualViewport?.scale || 1),
+          };
+          const screenInfo = window.screen ? {
+            width: Math.round(window.screen.width || 0),
+            height: Math.round(window.screen.height || 0),
+            availWidth: Math.round(window.screen.availWidth || 0),
+            availHeight: Math.round(window.screen.availHeight || 0),
+            pixelDepth: Number(window.screen.pixelDepth || 0),
+          } : null;
+          return {
+            kind: safeString(state.kind || 'boot_error', 64),
+            title: safeString(state.title || 'BOOT ERROR', 128),
+            message: safeString(state.message || '', 500),
+            stack: safeString(state.stack || '', 8000),
+            sourceUrl: safeString(state.sourceUrl || '', 240),
+            lineNumber: Number.isFinite(state.lineNumber) ? state.lineNumber : null,
+            columnNumber: Number.isFinite(state.columnNumber) ? state.columnNumber : null,
+            reasonType: safeString(state.reasonType || '', 64),
+            route: safeString(window.location.hash || window.location.pathname || '', 200),
+            href: safeString(window.location.href || '', 240),
+            pageTitle: safeString(document.title || '', 200),
+            pageVisibility: safeString(document.visibilityState || '', 32),
+            userAgent: safeString(navigator.userAgent || '', 240),
+            locale: safeString(navigator.language || '', 32),
+            clientTs: Number.isFinite(state.clientTs) ? state.clientTs : Date.now(),
+            viewport,
+            screenInfo,
+            lastKnownClientError: known || null,
+            contextJson: safeString(JSON.stringify({
+              bootState: state,
+              currentRoute: window.location.hash || window.location.pathname || '',
+              hasClientErrorSender: typeof window.__SHINE_SEND_CLIENT_ERROR__ === 'function',
+            }), 2000),
+          };
+        };
+        const buildSendPayload = (report) => {
+          const payload = {
+            kind: safeString(report?.kind || 'boot_error', 64),
+            message: safeString(report?.message || report?.title || 'Неизвестная ошибка', 500),
+            stack: safeString(report?.stack || '', 8000),
+            sourceUrl: safeString(report?.sourceUrl || '', 240),
+            lineNumber: Number.isFinite(report?.lineNumber) ? report.lineNumber : null,
+            columnNumber: Number.isFinite(report?.columnNumber) ? report.columnNumber : null,
+            route: safeString(report?.route || '', 200),
+            href: safeString(report?.href || '', 240),
+            userAgent: safeString(report?.userAgent || '', 240),
+            clientTs: Number.isFinite(report?.clientTs) ? report.clientTs : Date.now(),
+            requestOp: '',
+            requestIdRef: '',
+            contextJson: safeString(JSON.stringify({
+              ...report,
+              contextJson: undefined,
+            }), 2000),
+          };
+          return payload;
+        };
+        const shareErrorText = async (report) => {
+          const text = formatReportText(report);
+          if (!text) throw new Error('Текст ошибки пуст');
+          if (!navigator.share) {
+            throw new Error('Отправка через системное меню недоступна в этом браузере');
+          }
+          try {
+            await navigator.share({
+              title: report?.title || 'Описание ошибки',
+              text,
+            });
+          } catch (error) {
+            if (error?.name === 'AbortError') return false;
+            throw error;
+          }
+          return true;
+        };
+        const formatReportText = (report) => {
+          const lines = [
+            `Ошибка: ${report.title || report.kind || 'unknown'}`,
+            `Описание: ${report.message || '—'}`,
+            `Окно: ${report.pageTitle || '—'}`,
+            `Маршрут: ${report.route || '—'}`,
+            `URL: ${report.href || '—'}`,
+            `Видимость: ${report.pageVisibility || '—'}`,
+            `Время: ${new Date(Number(report.clientTs || Date.now())).toISOString()}`,
+            `UA: ${report.userAgent || '—'}`,
+            `Экран: ${report.viewport ? `${report.viewport.width}x${report.viewport.height} @${report.viewport.dpr || 1}x` : '—'}`,
+            `Монитор: ${report.screenInfo ? `${report.screenInfo.width}x${report.screenInfo.height}` : '—'}`,
+            `Источник: ${report.sourceUrl || '—'}`,
+            `Строка: ${Number.isFinite(report.lineNumber) ? report.lineNumber : '—'}`,
+            `Колонка: ${Number.isFinite(report.columnNumber) ? report.columnNumber : '—'}`,
+            `Тип причины: ${report.reasonType || '—'}`,
+          ];
+          if (report.stack) {
+            lines.push('Stack:', report.stack);
+          }
+          if (report.lastKnownClientError) {
+            lines.push('Последняя известная ошибка:', JSON.stringify(report.lastKnownClientError, null, 2));
+          }
+          if (report.contextJson) {
+            lines.push('Контекст:', report.contextJson);
+          }
+          return lines.join('\n');
+        };
+        const copyText = async (text) => {
+          const value = String(text || '');
+          if (!value) return false;
+          if (navigator.clipboard?.writeText) {
+            await navigator.clipboard.writeText(value);
+            return true;
+          }
+          const ta = document.createElement('textarea');
+          ta.value = value;
+          ta.setAttribute('readonly', 'readonly');
+          ta.style.position = 'fixed';
+          ta.style.opacity = '0';
+          ta.style.pointerEvents = 'none';
+          document.body.append(ta);
+          ta.focus();
+          ta.select();
+          const ok = document.execCommand('copy');
+          ta.remove();
+          return !!ok;
+        };
+        const removeMenu = () => {
+          try {
+            document.getElementById(menuId)?.remove();
+          } catch {}
+        };
+        const openMenu = () => {
+          try {
+            removeMenu();
+            const report = buildReport();
+            const root = document.getElementById('modal-root') || document.body;
+            const shell = document.createElement('div');
+            shell.id = menuId;
+            shell.className = 'modal-shell boot-error-menu-shell';
+            shell.innerHTML = `
+              <div class="modal-backdrop" data-action="close"></div>
+              <div class="modal-dialog boot-error-menu-dialog" role="dialog" aria-modal="true" aria-labelledby="boot-error-menu-title" tabindex="-1">
+                <div class="modal-card stack boot-error-menu-card">
+                  <strong class="modal-title" id="boot-error-menu-title">Описание ошибки</strong>
+                  <p class="meta-muted boot-error-menu-message">${escapeText(report.message || report.title || 'Ошибка')}</p>
+                  <button type="button" class="secondary-btn" data-action="copy">Скопировать текст ошибки</button>
+                  <button type="button" class="secondary-btn" data-action="share">Отправить текст ошибки</button>
+                  <button type="button" class="secondary-btn" data-action="send"${typeof window.__SHINE_SEND_CLIENT_ERROR_TO_SERVER__ === 'function' ? '' : ' disabled'}>Отправить в лог на сервере</button>
+                  <button type="button" class="ghost-btn" data-action="close">Закрыть</button>
+                </div>
+              </div>
+            `;
+            root.append(shell);
+
+            const dialog = shell.querySelector('.modal-dialog');
+            const close = () => {
+              window.removeEventListener('keydown', onKeyDown);
+              shell.remove();
+            };
+            const onKeyDown = (event) => {
+              if (event.key === 'Escape') {
+                event.preventDefault();
+                close();
+              }
+            };
+
+            shell.addEventListener('click', (event) => {
+              if (event.target === shell || event.target?.dataset?.action === 'close') {
+                close();
+              }
+            });
+
+            shell.querySelector('[data-action="copy"]')?.addEventListener('click', async () => {
+              try {
+                await copyText(formatReportText(report));
+                showFeedback('Описание ошибки скопировано');
+              } catch {
+                showFeedback('Не удалось скопировать описание ошибки', 'error');
+              }
+              close();
+            });
+
+            shell.querySelector('[data-action="share"]')?.addEventListener('click', async () => {
+              try {
+                const shared = await shareErrorText(report);
+                if (shared === false) return close();
+                showFeedback('Текст ошибки открыт для отправки');
+              } catch (error) {
+                showFeedback(error?.message || 'Не удалось открыть системное меню отправки', 'error');
+              }
+              close();
+            });
+
+            shell.querySelector('[data-action="send"]')?.addEventListener('click', async () => {
+              try {
+                const sender = window.__SHINE_SEND_CLIENT_ERROR_TO_SERVER__;
+                if (typeof sender !== 'function') {
+                  throw new Error('Отправка в лог на сервере недоступна');
+                }
+                const ok = await sender(buildSendPayload(report));
+                if (!ok) {
+                  throw new Error('Не удалось отправить ошибку в лог на сервере');
+                }
+                showFeedback('Ошибка отправлена в лог на сервере');
+              } catch (error) {
+                showFeedback(error?.message || 'Не удалось отправить ошибку в лог на сервере', 'error');
+              }
+              close();
+            });
+
+            shell.querySelector('[data-action="close"]')?.addEventListener('click', close);
+            dialog?.focus?.();
+            window.addEventListener('keydown', onKeyDown);
+          } catch (error) {
+            console.warn('boot error menu failed', error);
+          }
+        };
+        const show = (title, text, extra = {}) => {
+          try {
+            const reportState = {
+              kind: safeString(extra.kind || title || 'boot_error', 64),
+              title: safeString(title || 'BOOT ERROR', 128),
+              message: safeString(extra.message || text || '', 500),
+              stack: safeString(extra.stack || '', 8000),
+              sourceUrl: safeString(extra.sourceUrl || extra.filename || '', 240),
+              lineNumber: Number.isFinite(extra.lineNumber) ? extra.lineNumber : (Number.isFinite(extra.lineno) ? extra.lineno : null),
+              columnNumber: Number.isFinite(extra.columnNumber) ? extra.columnNumber : (Number.isFinite(extra.colno) ? extra.colno : null),
+              reasonType: safeString(extra.reasonType || '', 64),
+              clientTs: Number.isFinite(extra.clientTs) ? extra.clientTs : Date.now(),
+            };
+            setState(reportState);
+
             let el = document.getElementById('boot-error-overlay');
             if (!el) {
               el = document.createElement('pre');
@@ -72,17 +348,46 @@ window.__SHINE_BUILD_HASH__ = '20260819190000';
               el.style.lineHeight = '1.4';
               el.style.zIndex = '999999';
               el.style.whiteSpace = 'pre-wrap';
+              el.style.cursor = 'pointer';
+              el.style.userSelect = 'none';
+              el.style.webkitUserSelect = 'none';
+              el.style.touchAction = 'manipulation';
+              el.setAttribute('role', 'button');
+              el.setAttribute('tabindex', '0');
+              el.setAttribute('aria-haspopup', 'dialog');
               document.body.appendChild(el);
+              el.addEventListener('click', openMenu);
+              el.addEventListener('keydown', (event) => {
+                if (event.key === 'Enter' || event.key === ' ') {
+                  event.preventDefault();
+                  openMenu();
+                }
+              });
             }
             el.textContent = `[BOOT ERROR] ${title}\n${String(text || '')}`;
+            el.setAttribute('aria-label', `${title}. Нажмите, чтобы открыть меню действий.`);
+            el.title = 'Нажмите, чтобы открыть меню действий';
           } catch {}
         };
         window.addEventListener('error', (e) => {
-          show('window.error', `${e?.message || ''}\n${e?.filename || ''}:${e?.lineno || ''}:${e?.colno || ''}`);
+          show('window.error', `${e?.message || ''}\n${e?.filename || ''}:${e?.lineno || ''}:${e?.colno || ''}`, {
+            kind: 'window_error',
+            message: e?.message || '',
+            stack: e?.error?.stack || '',
+            sourceUrl: e?.filename || '',
+            lineNumber: e?.lineno,
+            columnNumber: e?.colno,
+            reasonType: e?.error?.constructor?.name || e?.constructor?.name || 'ErrorEvent',
+          });
         });
         window.addEventListener('unhandledrejection', (e) => {
           const reason = e?.reason;
-          show('unhandledrejection', reason?.stack || reason?.message || String(reason || 'unknown'));
+          show('unhandledrejection', reason?.stack || reason?.message || String(reason || 'unknown'), {
+            kind: 'unhandled_rejection',
+            message: reason?.message || String(reason || 'Unhandled promise rejection'),
+            stack: reason?.stack || '',
+            reasonType: reason?.constructor?.name || typeof reason,
+          });
         });
       }());
     </script>

shine-UI/js/app.js

@@ -5,7 +5,13 @@ import {
   syncTrackedRouteHistory,
 } from './router.js';
 import { renderToolbar } from './components/toolbar.js';
-import { captureClientError, setClientErrorSentNotifier, setClientErrorTransport } from './services/client-error-reporter.js';
+import {
+  captureClientError,
+  getLastClientErrorPayload,
+  setClientErrorSentNotifier,
+  setClientErrorTransport,
+} from './services/client-error-reporter.js';
+import { attachScrollToBottomButton } from './components/scroll-to-bottom-button.js';
 import { initPwaInstallPromptHandling } from './services/pwa-install-service.js';
 import { initPwaPush } from './services/pwa-push-service.js';
 import { initCallUiOverlay } from './services/call-ui-service.js';
@@ -37,6 +43,7 @@ import {
   deleteConversationMessagesBefore,
   deleteSignedMessageByBaseKey,
   markIncomingReadByBaseKey,
+  markOutgoingDeliveryState,
   markOutgoingReadByBaseKey,
   normalizeDmChatId,
   setContacts,
@@ -80,17 +87,18 @@ import * as appLogView from './pages/app-log-view.js';
 import * as pwaDiagnosticsView from './pages/pwa-diagnostics-view.js';
 import * as solanaUsersInitView from './pages/solana-users-init-view.js';
 import * as solanaRpcCheckView from './pages/solana-rpc-check-view.js';
-import * as messagesList from './pages/messages-list.js';
+import * as messagesList from './pages/messages-list.js?v=202608221218';
 import * as contactSearchView from './pages/contact-search-view.js';
-import * as chatView from './pages/chat-view.js?v=202608191738';
+import * as chatView from './pages/chat-view.js?v=202608221218';
 import * as userProfileView from './pages/user-profile-view.js';
-import * as channelsList from './pages/channels-list.js';
+import * as channelsList from './pages/channels-list.js?v=202608221218';
 import * as channelView from './pages/channel-view.js';
+import * as channelAboutView from './pages/channel-about-view.js';
 import * as channelThreadView from './pages/channel-thread-view.js';
 import * as addChannelView from './pages/add-channel-view.js';
 import * as addPersonalPublicChatView from './pages/add-personal-public-chat-view.js';
-import * as networkView from './pages/network-view.js';
-import * as notificationsView from './pages/notifications-view.js';
+import * as networkView from './pages/network-view.js?v=202608221226';
+import * as notificationsView from './pages/notifications-view.js?v=202608221354';
 
 const CONVERSATION_CLEAR_NOTICE_TEXT = 'История переписки очищена с этого места';
 const DM_UNSUPPORTED_FORMAT_TEXT = 'Формат сообщения не поддерживается';
@@ -148,6 +156,7 @@ const routes = {
   user: userProfileView,
   'channels-list': channelsList,
   'channel-view': channelView,
+  'channel-about-view': channelAboutView,
   'channel-thread-view': channelThreadView,
   'add-channel-view': addChannelView,
   'add-personal-public-chat-view': addPersonalPublicChatView,
@@ -190,12 +199,22 @@ let initialConnectionCompleted = false;
 let orientationLockInFlight = false;
 let currentChromeCleanup = null;
 const CALL_PUSH_PENDING_ACTION_KEY = 'shine-ui-call-push-pending-action-v1';
+const SCROLL_TO_BOTTOM_PAGE_IDS = new Set([
+  'messages-list',
+  'chat-view',
+  'channels-list',
+  'channel-view',
+  'channel-thread-view',
+  'notifications-view',
+]);
+
 const GUEST_ALLOWED_PAGES = new Set([
   'start-view',
   'entry-settings-view',
   'network-view',
   'channels-list',
   'channel-view',
+  'channel-about-view',
   'channel-thread-view',
   'user',
   'contact-search-view',
@@ -208,6 +227,10 @@ setClientErrorSentNotifier((payload) => {
   const isoTs = new Date(Number(payload?.clientTs || Date.now())).toISOString();
   showToast(`Ошибка отправлена на сервер · ${login} · ${isoTs}`);
 });
+window.__SHINE_SEND_CLIENT_ERROR_TO_SERVER__ = (payload) => authService.reportClientError(payload);
+window.__SHINE_SEND_CLIENT_ERROR__ = window.__SHINE_SEND_CLIENT_ERROR_TO_SERVER__;
+window.__SHINE_GET_LAST_CLIENT_ERROR__ = () => getLastClientErrorPayload();
+window.__SHINE_SHOW_TOAST__ = (message, kind = 'success') => showToast(message, { kind });
 initPwaInstallPromptHandling();
 initCallUiOverlay();
 setCallDebugReporter((payload) => authService.reportClientDebug(payload));
@@ -1128,6 +1151,14 @@ function renderPageFailureFallback(pageId, error) {
   refreshConnectionUi();
 }
 
+function attachPageScrollToBottom(pageId, screen) {
+  if (!SCROLL_TO_BOTTOM_PAGE_IDS.has(pageId)) return null;
+
+  return attachScrollToBottomButton({
+    scrollContainer: () => screen.querySelector('.dm-chat-wrap') || screenEl,
+  });
+}
+
 function renderApp() {
   syncTrackedRouteHistory(window.location.pathname || '/');
   const route = getRoute();
@@ -1164,7 +1195,12 @@ function renderApp() {
     }
 
     screenEl.append(screen);
-    currentCleanup = typeof screen.cleanup === 'function' ? screen.cleanup : null;
+    const pageCleanup = typeof screen.cleanup === 'function' ? screen.cleanup : null;
+    const scrollToBottomControl = attachPageScrollToBottom(pageId, screen);
+    currentCleanup = () => {
+      pageCleanup?.();
+      scrollToBottomControl?.cleanup();
+    };
 
     screenEl.classList.toggle('no-app-chrome', !showAppChrome);
     screenEl.classList.toggle('preauth-flow', PRE_AUTH_PAGES.includes(pageId));
@@ -1358,6 +1394,17 @@ async function init() {
     });
   });
 
+  authService.onEvent('DmDeliveryStateChanged', (evt) => {
+    const payload = evt?.payload || {};
+    const changed = markOutgoingDeliveryState({
+      outgoingKey: payload.outgoingKey,
+      baseKey: payload.baseKey,
+      deliveryState: payload.deliveryState,
+    });
+    if (!changed) return;
+    window.dispatchEvent(new CustomEvent('shine-dm-delivery-updated', { detail: payload }));
+  });
+
   authService.onEvent('SignedMessageArrived', async (evt) => {
     const payload = evt?.payload || {};
     const messageKey = String(payload.messageKey || '').trim();

shine-UI/js/components/avatar-image.js

@@ -25,27 +25,28 @@ export function buildAvatarInitials({ login, firstName = '', lastName = '' } = {
   return (cleanLogin[0] || '?').toUpperCase();
 }
 
-export function renderUserAvatar({
-  login,
-  firstName = '',
-  lastName = '',
+export function renderAvatar({
+  initials = '?',
   avatar = null,
   size = 'large',
   className = '',
   title = '',
+  alt = 'Аватар',
+  glow = false,
 } = {}) {
   const wrap = document.createElement('div');
-  const classes = ['avatar', 'avatar-image'];
+  const classes = new Set(['avatar', 'avatar-image', 'avatar-framed']);
   const sizeClass = pickSizeClass(size);
-  if (sizeClass) classes.push(sizeClass);
+  if (sizeClass) classes.add(sizeClass);
   const extraClass = String(className || '').trim();
-  if (extraClass) classes.push(...extraClass.split(/\s+/g));
-  wrap.className = classes.join(' ');
+  if (extraClass) extraClass.split(/\s+/g).filter(Boolean).forEach((value) => classes.add(value));
+  if (glow) classes.add('avatar-glow');
+  wrap.className = Array.from(classes).join(' ');
   if (title) wrap.title = String(title);
 
   const fallback = document.createElement('span');
   fallback.className = 'avatar-fallback';
-  fallback.textContent = buildAvatarInitials({ login, firstName, lastName });
+  fallback.textContent = String(initials || '?').trim().slice(0, 2).toUpperCase() || '?';
   wrap.append(fallback);
 
   const txId = String(avatar?.ar || '').trim();
@@ -56,7 +57,8 @@ export function renderUserAvatar({
   const expectedSha256Hex = validateSha256Hex(sha256Hex) ? sha256Hex : '';
 
   const img = document.createElement('img');
-  img.alt = 'Аватар';
+  img.className = 'avatar-photo';
+  img.alt = String(alt || 'Аватар');
   img.loading = 'lazy';
   img.decoding = 'async';
   wrap.append(img);
@@ -131,3 +133,24 @@ export function renderUserAvatar({
 
   return wrap;
 }
+
+export function renderUserAvatar({
+  login,
+  firstName = '',
+  lastName = '',
+  avatar = null,
+  size = 'large',
+  className = '',
+  title = '',
+  glow = false,
+} = {}) {
+  return renderAvatar({
+    initials: buildAvatarInitials({ login, firstName, lastName }),
+    avatar,
+    size,
+    className,
+    title,
+    alt: 'Аватар',
+    glow,
+  });
+}

shine-UI/js/components/header.js

@@ -1,14 +1,20 @@
-export function renderHeader({ title, leftAction, leftLabel = '', rightActions = [] }) {
+export function renderHeader({ title = '', centerNode = null, leftAction, leftLabel = '', rightActions = [] }) {
   const wrap = document.createElement('header');
-  wrap.className = 'page-header';
+  wrap.className = 'page-header app-topbar-shell';
 
   const left = document.createElement('div');
   left.className = 'header-left';
   if (leftAction) {
     const btn = document.createElement('button');
     btn.type = 'button';
-    btn.className = 'icon-btn';
-    btn.textContent = leftAction.label;
+    const rawLabel = String(leftAction.label || '').trim();
+    const isBackAction = rawLabel === '←' || rawLabel === '<' || rawLabel === '‹';
+    btn.className = `icon-btn${isBackAction ? ' header-back-btn' : ''}`;
+    btn.textContent = isBackAction ? '←' : rawLabel;
+    if (isBackAction) {
+      btn.setAttribute('aria-label', leftAction.ariaLabel || 'Назад');
+      btn.title = leftAction.title || 'Назад';
+    }
     btn.addEventListener('click', leftAction.onClick);
     left.append(btn);
   }
@@ -19,9 +25,16 @@ export function renderHeader({ title, leftAction, leftLabel = '', rightActions =
     left.append(label);
   }
 
-  const h1 = document.createElement('h1');
-  h1.className = 'page-title';
-  h1.textContent = title;
+  const center = document.createElement('div');
+  center.className = 'header-center';
+  if (centerNode instanceof Node) {
+    center.append(centerNode);
+  } else {
+    const h1 = document.createElement('h1');
+    h1.className = 'page-title';
+    h1.textContent = title;
+    center.append(h1);
+  }
 
   const right = document.createElement('div');
   right.className = 'header-actions';
@@ -40,6 +53,6 @@ export function renderHeader({ title, leftAction, leftLabel = '', rightActions =
     right.append(btn);
   });
 
-  wrap.append(left, h1, right);
+  wrap.append(left, center, right);
   return wrap;
 }

shine-UI/js/components/overflow-dots.js

@@ -0,0 +1,10 @@
+export function createOverflowDots({ className = '' } = {}) {
+  const dots = document.createElement('span');
+  const extra = String(className || '').trim();
+  dots.className = `app-overflow-dots${extra ? ` ${extra}` : ''}`;
+  dots.setAttribute('aria-hidden', 'true');
+  for (let i = 0; i < 3; i += 1) {
+    dots.append(document.createElement('i'));
+  }
+  return dots;
+}

shine-UI/js/components/scroll-to-bottom-button.js

@@ -0,0 +1,144 @@
+function resolveElement(value) {
+  return typeof value === 'function' ? value() : value;
+}
+
+function buildArrowIcon() {
+  const icon = document.createElement('span');
+  icon.className = 'scroll-to-bottom-btn__icon';
+  icon.setAttribute('aria-hidden', 'true');
+  icon.textContent = '↓';
+  return icon;
+}
+
+export function attachScrollToBottomButton({
+  scrollContainer,
+  mountTarget = document.querySelector('.app-shell'),
+  thresholdPx = 160,
+  title = 'Вниз',
+} = {}) {
+  const target = resolveElement(mountTarget);
+  if (!(target instanceof Element)) {
+    return {
+      button: null,
+      refresh() {},
+      cleanup() {},
+    };
+  }
+
+  const button = document.createElement('button');
+  button.type = 'button';
+  button.className = 'scroll-to-bottom-btn';
+  button.title = title;
+  button.setAttribute('aria-label', 'Прокрутить ленту вниз');
+  button.tabIndex = -1;
+  button.append(buildArrowIcon());
+  target.append(button);
+
+  let disposed = false;
+  let boundContainer = null;
+  let resizeObserver = null;
+  let mutationObserver = null;
+  let refreshFrame = 0;
+
+  const hide = () => {
+    button.classList.remove('is-visible');
+    button.setAttribute('aria-hidden', 'true');
+    button.tabIndex = -1;
+  };
+
+  const scheduleRefresh = () => {
+    if (disposed || refreshFrame) return;
+    refreshFrame = window.requestAnimationFrame(() => {
+      refreshFrame = 0;
+      refresh();
+    });
+  };
+
+  const unbindContainer = () => {
+    boundContainer?.removeEventListener('scroll', scheduleRefresh);
+    resizeObserver?.disconnect();
+    mutationObserver?.disconnect();
+    resizeObserver = null;
+    mutationObserver = null;
+    boundContainer = null;
+  };
+
+  const bindContainer = () => {
+    const nextContainer = resolveElement(scrollContainer);
+    if (!(nextContainer instanceof Element)) {
+      if (boundContainer) unbindContainer();
+      return null;
+    }
+    if (nextContainer === boundContainer) return boundContainer;
+
+    unbindContainer();
+    boundContainer = nextContainer;
+    boundContainer.addEventListener('scroll', scheduleRefresh, { passive: true });
+
+    if (typeof ResizeObserver === 'function') {
+      resizeObserver = new ResizeObserver(scheduleRefresh);
+      resizeObserver.observe(boundContainer);
+    }
+
+    if (typeof MutationObserver === 'function') {
+      mutationObserver = new MutationObserver(scheduleRefresh);
+      mutationObserver.observe(boundContainer, { childList: true, subtree: true });
+    }
+
+    return boundContainer;
+  };
+
+  function refresh() {
+    if (disposed) return;
+    const container = bindContainer();
+    if (!container) {
+      hide();
+      return;
+    }
+
+    const scrollHeight = Number(container.scrollHeight || 0);
+    const clientHeight = Number(container.clientHeight || 0);
+    const scrollTop = Number(container.scrollTop || 0);
+    const maxScrollTop = Math.max(0, scrollHeight - clientHeight);
+    const distanceToBottom = Math.max(0, maxScrollTop - scrollTop);
+    const shouldShow = maxScrollTop > 8 && distanceToBottom > Math.max(24, Number(thresholdPx || 0));
+
+    button.classList.toggle('is-visible', shouldShow);
+    button.setAttribute('aria-hidden', shouldShow ? 'false' : 'true');
+    button.tabIndex = shouldShow ? 0 : -1;
+  }
+
+  const scrollToBottom = () => {
+    const container = bindContainer();
+    if (!container) return;
+    if (typeof container.scrollTo === 'function') {
+      container.scrollTo({ top: container.scrollHeight, behavior: 'smooth' });
+    } else {
+      container.scrollTop = container.scrollHeight;
+    }
+    scheduleRefresh();
+  };
+
+  button.addEventListener('click', scrollToBottom);
+  window.addEventListener('resize', scheduleRefresh);
+  window.visualViewport?.addEventListener('resize', scheduleRefresh);
+  window.requestAnimationFrame(refresh);
+
+  return {
+    button,
+    refresh: scheduleRefresh,
+    cleanup() {
+      if (disposed) return;
+      disposed = true;
+      if (refreshFrame) {
+        window.cancelAnimationFrame(refreshFrame);
+        refreshFrame = 0;
+      }
+      unbindContainer();
+      window.removeEventListener('resize', scheduleRefresh);
+      window.visualViewport?.removeEventListener('resize', scheduleRefresh);
+      button.removeEventListener('click', scrollToBottom);
+      button.remove();
+    },
+  };
+}