diff --git a/src/media_delivery/media_delivery.c b/src/media_delivery/media_delivery.c
index c3f152c5..b673995a 100644
--- a/src/media_delivery/media_delivery.c
+++ b/src/media_delivery/media_delivery.c
@@ -90,6 +90,11 @@ static int md_sql_begin(sqlite3* db, const char* sql) {
     return md_sql_exec(db, sql);
 }
 
+/* SQLite может сама откатить транзакцию при отказе commit/IO; чужую или уже завершённую не трогаем. */
+static void md_sql_rollback(sqlite3* db) {
+    if (!sqlite3_get_autocommit(db)) md_sql_exec(db, "ROLLBACK");
+}
+
 /* Вызывается внутри собственной транзакции. Максимум (status,timestamp) идемпотентен;
  * REPLACE выполняется только при изменении, поэтому повтор не расходует AUTOINCREMENT ID. */
 static int md_ba_merge(sqlite3* db, const uint8_t block_id[16], uint64_t group_id,
@@ -469,7 +474,7 @@ static size_t md_repl_page(struct media_super_peer* peer, uint8_t packet[MEDIA_S
                 (unsigned long long)from, (unsigned long long)(more ? last : high), count, more);
     return sizeof(*r) + count * sizeof(*rows);
 failed:
-    md_sql_exec(md->db, "ROLLBACK");
+    md_sql_rollback(md->db);
     return sizeof(*r);
 }
 
@@ -648,7 +653,7 @@ static void md_handle_announcement(struct media_delivery_ctx* md, uint64_t group
     if (!md_sql_begin(md->db, "BEGIN IMMEDIATE")) {
         changed = md_ba_merge(md->db, hb->block_id, group_id, from_node, hb->chunk, hb->timestamp, status);
         if (changed < 0 || md_sql_exec(md->db, "COMMIT")) {
-            md_sql_exec(md->db, "ROLLBACK"); changed = -1;
+            md_sql_rollback(md->db); changed = -1;
         }
     }
     if (status) {
@@ -710,7 +715,7 @@ static void md_handle_sync_resp(struct media_delivery_ctx* md, uint64_t group_id
             if (rc == SQLITE_OK) rc = sqlite3_bind_int64(st, 2, (sqlite3_int64)from_node);
             if (rc == SQLITE_OK) rc = sqlite3_step(st);
             if (md_sql_finish(md->db, st, rc, "reset ahead cursor") || md_sql_exec(md->db, "COMMIT")) {
-                md_sql_exec(md->db, "ROLLBACK"); return;
+                md_sql_rollback(md->db); return;
             }
             peer->request_pending = peer->request_send = 0;
             peer->timeout_tb = MEDIA_REPL_TIMEOUT_MAX_TB;
@@ -741,7 +746,7 @@ static void md_handle_sync_resp(struct media_delivery_ctx* md, uint64_t group_id
         int applied = md_ba_merge(md->db, rows[i].block_id, group_id, md_read_le(&rows[i].node_id, 8),
                                   (uint32_t)md_read_le(&rows[i].chunk, 4), (int64_t)md_read_le(&rows[i].timestamp, 8),
                                   rows[i].status);
-        if (applied < 0) { md_sql_exec(md->db, "ROLLBACK"); return; }
+        if (applied < 0) { md_sql_rollback(md->db); return; }
         changed += applied;
     }
     sqlite3_stmt* st = NULL;
@@ -753,7 +758,7 @@ static void md_handle_sync_resp(struct media_delivery_ctx* md, uint64_t group_id
     if (rc == SQLITE_OK) rc = sqlite3_bind_int64(st, 4, (sqlite3_int64)next);
     if (rc == SQLITE_OK) rc = sqlite3_step(st);
     if (md_sql_finish(md->db, st, rc, "save RX cursor") || md_sql_exec(md->db, "COMMIT")) {
-        md_sql_exec(md->db, "ROLLBACK"); return;
+        md_sql_rollback(md->db); return;
     }
     DEBUG_DEBUG(DEBUG_CATEGORY_MEDIA, "%s: SYNC committed group=%llx peer=%llx uuid=%02x%02x epoch=%02x%02x from=%llu next=%llu n=%u changed=%d more=%u dirty=%u",
                 MD_ID, (unsigned long long)group_id, (unsigned long long)from_node, r->request_id[0], r->request_id[1],
@@ -1144,7 +1149,7 @@ static int md_purge_group(struct media_delivery_ctx* md, uint64_t group_id, int
                            MD_ID, (unsigned long long)group_id, removed, all);
     return 0;
 failed:
-    md_sql_exec(md->db, "ROLLBACK"); return -1;
+    md_sql_rollback(md->db); return -1;
 }
 
 /* Единственный суперузел тоже должен реплицировать собственные зарегистрированные блоки.
@@ -1166,7 +1171,7 @@ static int md_seed_local(struct media_delivery_ctx* md, uint64_t group_id) {
         changed += applied;
     }
     if (md_sql_finish(md->db, st, rc, "seed own blocks") || md_sql_exec(md->db, "COMMIT")) {
-        md_sql_exec(md->db, "ROLLBACK"); return -1;
+        md_sql_rollback(md->db); return -1;
     }
     if (changed) {
         DEBUG_DEBUG(DEBUG_CATEGORY_MEDIA, "%s: own blocks seeded group=%llx changed=%d", MD_ID,
@@ -1398,7 +1403,7 @@ static int media_delivery_create_tables(struct UTUN_INSTANCE* inst) {
     DEBUG_INFO(DEBUG_CATEGORY_MEDIA, "%s: catalog initialized reset=%d epoch=%02x%02x", MD_ID, reset, epoch[0], epoch[1]);
     return 0;
 failed:
-    md_sql_exec(db, "ROLLBACK"); return -1;
+    md_sql_rollback(db); return -1;
 }
 
 /* ── public API ── */
diff --git a/tests/test_media_delivery_integration.c b/tests/test_media_delivery_integration.c
index 4365148c..dc37a409 100644
--- a/tests/test_media_delivery_integration.c
+++ b/tests/test_media_delivery_integration.c
@@ -20,6 +20,7 @@
 #include "../routing_layer/topo_node.h"
 #include "../routing_layer/topo_node_sqlite.h"
 #include "../chat/member_sync.h"
+#include "../chat/chat_core.h"
 #include "../transport_layer/secure_channel.h"
 #include "../lib/u_async.h"
 #include "../lib/debug_config.h"
@@ -346,7 +347,11 @@ int main(void) {
     if (!g_a || !g_b) { printf("FAIL: instance create\n"); goto done; }
     test_etcp_set_peer(g_a, "to_b", g_b, "s1");
     utun_instance_init(g_a); utun_instance_init(g_b);
-    media_delivery_init(g_a); media_delivery_init(g_b);
+    char chat_db_a[512], chat_db_b[512];
+    snprintf(chat_db_a, sizeof(chat_db_a), "%s/chats.db", db_a);
+    snprintf(chat_db_b, sizeof(chat_db_b), "%s/chats.db", db_b);
+    if (chat_core_init(g_a, chat_db_a) || chat_core_init(g_b, chat_db_b)
+        || media_delivery_init(g_a) || media_delivery_init(g_b)) { FAIL("chat/media initialization"); goto done; }
 
     if (setup_chat()) { FAIL("CHAT setup failed"); goto done; }