diff --git a/src/chat/chat_sync.c b/src/chat/chat_sync.c
index 8dc062ce..2d4c5f0f 100644
--- a/src/chat/chat_sync.c
+++ b/src/chat/chat_sync.c
@@ -1247,12 +1247,20 @@ static void cs_handle_join_info_resp(struct chat_sync* cs, uint64_t peer,
     chat_core_ensure_channel_ready(cs->inst, ch_id);
 
     /* добавить connection-узел в мемберы (дерево приглашений из INFO_RESP) */
-    sqlite3* vdb = cs->inst->topo_sqlite_db;
-    topo_node_sqlite_member_block_put(vdb, ch_id, c_node_id, c_join_sig, c_join_ts,
-                                      c_update_sig, c_update_ts, c_x25519, c_ed,
-                                      c_userinfo, NULL, c_signed_by, c_signature);
-    { char cn_name[128]; json_flat_get(c_userinfo, "name", cn_name, sizeof(cn_name));
-      topo_node_sqlite_node_update_verified(vdb, c_node_id, cn_name, c_x25519, c_ed, c_join_ts, ntp_time_get_seconds(cs->inst)); }
+    struct ms_member_rec connection_member = {
+        .node_id = c_node_id, .x25519 = c_x25519, .ed25519 = c_ed,
+        .join_sig = c_join_sig, .join_ts = c_join_ts, .update_sig = c_update_sig, .update_ts = c_update_ts,
+        .userinfo = c_userinfo, .signed_by = c_signed_by, .signature = c_signature
+    };
+    /* Запись модели и Merkle-индекс меняются в одной транзакции member_sync. */
+    int mrc = member_sync_apply_record(cs->inst, ch_id, peer, &connection_member);
+    if (mrc < 0) {
+        DEBUG_ERROR(DEBUG_CATEGORY_MEMBER_SYNC, "%s: JOIN_INFO_RESP member rejected ch=%s node=%016llx rc=%d",
+                    CS_ID, ch_id, (unsigned long long)c_node_id, mrc);
+        return;
+    }
+    DEBUG_DEBUG(DEBUG_CATEGORY_MEMBER_SYNC, "%s: JOIN_INFO_RESP member indexed ch=%s node=%016llx rc=%d",
+                CS_ID, ch_id, (unsigned long long)c_node_id, mrc);
 
     /* построить собственный join_sig */
     uint64_t myid = cs->inst->node_id;
diff --git a/src/chat/db_sync.c b/src/chat/db_sync.c
index 34d09322..be09cb7d 100644
--- a/src/chat/db_sync.c
+++ b/src/chat/db_sync.c
@@ -765,7 +765,7 @@ static void db_handle_request_sync(struct DB_SYNC_INSTANCE* si, uint64_t src, co
 {
     (void)p; (void)len;
     struct SI_PEER* sp = si_peer_add(si, src);
-    if (sp && is_master(si->db_sync->inst->node_id, src)) {
+    if (sp && sp->sync_state != 1 && is_master(si->db_sync->inst->node_id, src)) {
         db_sync_initiate_sync(si, src);
     }
 }
@@ -1123,8 +1123,8 @@ static void db_handle_sync_done(struct DB_SYNC_INSTANCE* si, uint64_t src, const
         // mc > pc: send tail
         if (sp) sp->last_peer_count = pc;
         uint32_t scnt = mc - pc; if (scnt > DB_SEND_DATA_MAX) scnt = DB_SEND_DATA_MAX;
-        si_send_data_batch(si, src, pc, scnt, pc > 0 ? pc - 1 : (uint32_t)-1, DB_WANT_FROM_NONE);
-        if (sp) sp->sync_state = 1;
+        if (si_send_data_batch(si, src, pc, scnt, pc > 0 ? pc - 1 : (uint32_t)-1, DB_WANT_FROM_NONE) < 0) return;
+        if (sp) { sp->sync_state = 1; sp->sync_start_tb = get_time_tb(); }
         DEBUG_INFO(DEBUG_CATEGORY_CHAT_SYNC, "sync [%s:%04llX] ← SYNC_DONE: mc=%u > pc=%u → send tail from=%u",
                    SI_SHRT(si), (unsigned long long)(src >> 16), mc, pc, pc);
     } else {