diff --git a/tests/test_chat_sync_stress.c b/tests/test_chat_sync_stress.c
index 26756ca0..b632ee95 100644
--- a/tests/test_chat_sync_stress.c
+++ b/tests/test_chat_sync_stress.c
@@ -119,14 +119,18 @@ static int wait_for(const char* desc, int timeout_tb, uint64_t* elapsed_out) {
     return ok;
 }
 
-/* db_sync-валидация требует, чтобы пир был мембером канала (peers_<group_id>). */
+/* Изолированная фикстура db_sync: полное членство задано заранее; проверка join-подписей — в test_chat_join_e2e. */
 static void seed_members(struct UTUN_INSTANCE* self, struct UTUN_INSTANCE* peer) {
     sqlite3* db = self ? self->topo_sqlite_db : NULL;
     if (!db || !peer || !peer->node_id) return;
     char ch_id[32]; snprintf(ch_id, sizeof(ch_id), "%u", INSTANCE_ID);
     uint8_t z32[32] = {0}, z64[64] = {0};
     topo_node_sqlite_channel_put(db, ch_id, INSTANCE_NAME, 0, z32, NULL, z32, NULL, z64);
-    topo_node_sqlite_member_placeholder_put(db, ch_id, peer->node_id, z32, z32);
+    if (topo_node_sqlite_node_update_verified(db, peer->node_id, "stress peer", peer->my_keys.public_key,
+        peer->my_ed25519_pubkey, 1, 0) < 0 || topo_node_sqlite_member_block_put(db, ch_id, peer->node_id, z64, 1,
+        NULL, 0, peer->my_keys.public_key, peer->my_ed25519_pubkey, "{}", NULL, 0, z64) < 0) {
+        DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "stress member fixture failed peer=%016llx", (unsigned long long)peer->node_id); abort();
+    }
     if (!topo_groups_find(self->topo_groups, INSTANCE_ID))
         topo_groups_create_group(self->topo_groups, INSTANCE_ID, TOPO_GROUP_TYPE_CHAT, ch_id);
 }
diff --git a/tests/test_db_sync.c b/tests/test_db_sync.c
index 11e801e2..b435b0c2 100644
--- a/tests/test_db_sync.c
+++ b/tests/test_db_sync.c
@@ -193,8 +193,7 @@ static void remove_si(struct DB_SYNC_INSTANCE** psi) {
     if (*psi) { db_sync_instance_remove(*psi); *psi = NULL; }
 }
 
-/* db_sync-валидация требует, чтобы пир был мембером канала (peers_<group_id>).
- * Тест db_sync работает в изоляции — создаём peers-таблицы и помечаем пиров мемберами. */
+/* Изолированная фикстура db_sync задаёт полное членство; join-подписи проверяет test_chat_join_e2e. */
 static void seed_members(struct UTUN_INSTANCE* self, struct UTUN_INSTANCE** peers, int peer_count) {
     static const char* groups[] = { "1", "2", "30", "40", "70", "80" };
     sqlite3* db = self ? self->topo_sqlite_db : NULL;
@@ -202,9 +201,15 @@ static void seed_members(struct UTUN_INSTANCE* self, struct UTUN_INSTANCE** peer
     uint8_t z32[32] = {0}, z64[64] = {0};
     for (unsigned gi = 0; gi < sizeof(groups) / sizeof(groups[0]); gi++) {
         topo_node_sqlite_channel_put(db, groups[gi], "test", 0, z32, NULL, z32, NULL, z64);
-        for (int i = 0; i < peer_count; i++)
-            if (peers[i] && peers[i]->node_id)
-                topo_node_sqlite_member_placeholder_put(db, groups[gi], peers[i]->node_id, z32, z32);
+        for (int i = 0; i < peer_count; i++) {
+            struct UTUN_INSTANCE* peer = peers[i];
+            if (!peer || !peer->node_id) continue;
+            if (topo_node_sqlite_node_update_verified(db, peer->node_id, "sync peer", peer->my_keys.public_key,
+                peer->my_ed25519_pubkey, 1, 0) < 0 || topo_node_sqlite_member_block_put(db, groups[gi], peer->node_id, z64, 1,
+                NULL, 0, peer->my_keys.public_key, peer->my_ed25519_pubkey, "{}", NULL, 0, z64) < 0) {
+                DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "member fixture failed peer=%016llx", (unsigned long long)peer->node_id); abort();
+            }
+        }
         uint64_t gid = strtoull(groups[gi], NULL, 10);
         if (!topo_groups_find(self->topo_groups, gid))
             topo_groups_create_group(self->topo_groups, gid, TOPO_GROUP_TYPE_CHAT, groups[gi]);