diff --git a/src/chat/chat_feedback.c b/src/chat/chat_feedback.c
index e3d86a85..39cb67cf 100644
--- a/src/chat/chat_feedback.c
+++ b/src/chat/chat_feedback.c
@@ -428,10 +428,13 @@ static int fb_next_channel(struct UTUN_INSTANCE* inst, const char* after, char c
 /* Пересчитывает только листья, зависящие от изменённого автора/ключа пригласившего. */
 int chat_feedback_member_update(struct UTUN_INSTANCE* inst, uint64_t node_id) {
     if (!merkle_sync_registered(inst, MT_DATA_FEEDBACK)) return 0;
-    if (sqlite3_get_autocommit(inst->topo_sqlite_db)) return fb_db_error(inst, "-", "member update requires transaction");
+    if (sqlite3_get_autocommit(inst->topo_sqlite_db)) {
+        DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "feedback: member update requires transaction node=%016llx",
+            (unsigned long long)node_id); return -1;
+    }
     char channel[21] = "", next[21]; int scan;
     while ((scan = fb_next_channel(inst, channel, next, 1)) > 0) {
-        memcpy(channel, next, sizeof(channel));
+        strcpy(channel, next);
         char table[40], sql[384]; if (fb_table(inst, channel, table, NULL) < 0) return -1;
         snprintf(sql, sizeof(sql), "SELECT DISTINCT f.bucket FROM %s f LEFT JOIN peers_%s p ON p.node_id=f.node_id"
             " WHERE f.node_id=?1 OR p.signed_by=?1 ORDER BY f.bucket", table, channel);
@@ -448,7 +451,10 @@ int chat_feedback_member_update(struct UTUN_INSTANCE* inst, uint64_t node_id) {
             buckets++;
         }
         int final = sqlite3_finalize(st);
-        if (rc != SQLITE_DONE || final != SQLITE_OK) return fb_db_error(inst, channel, "member index update");
+        if (rc != SQLITE_DONE || final != SQLITE_OK) {
+            DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "feedback: member index failed ch=%s dependency=%016llx step=%d finalize=%d",
+                channel, (unsigned long long)node_id, rc, final); return -1;
+        }
         if (buckets) DEBUG_DEBUG(DEBUG_CATEGORY_CHAT_SYNC, "feedback: member index updated ch=%s dependency=%016llx buckets=%u",
             channel, (unsigned long long)node_id, buckets);
     }
@@ -461,7 +467,7 @@ void chat_feedback_member_committed(struct UTUN_INSTANCE* inst, uint64_t node_id
     if (!sqlite3_get_autocommit(inst->topo_sqlite_db)) { fb_db_error(inst, "-", "member notify before commit"); return; }
     char channel[21] = "", next[21];
     while (fb_next_channel(inst, channel, next, 1) > 0) {
-        memcpy(channel, next, sizeof(channel));
+        strcpy(channel, next);
         /* Даже без локального feedback ключ может разрешить приём ранее отложенной страницы. */
         merkle_sync_changed(inst, MT_DATA_FEEDBACK, channel);
         char table[40], sql[512]; if (fb_table(inst, channel, table, NULL) < 0) return;
@@ -502,7 +508,7 @@ int chat_feedback_init(struct UTUN_INSTANCE* inst) {
         return fb_db_error(inst, "-", "init begin");
     char channel[21] = "", next[21]; int scan, result = 0; unsigned buckets = 0;
     while ((scan = fb_next_channel(inst, channel, next, 0)) > 0) {
-        memcpy(channel, next, sizeof(channel));
+        strcpy(channel, next);
         char table[40], sql[128];
         if (chat_feedback_ensure_channel(inst, channel) < 0 || fb_table(inst, channel, table, NULL) < 0) { result = -1; break; }
         snprintf(sql, sizeof(sql), "SELECT DISTINCT bucket FROM %s ORDER BY bucket", table);
diff --git a/src/chat/member_sync.c b/src/chat/member_sync.c
index 6dae5f65..566a4ddf 100644
--- a/src/chat/member_sync.c
+++ b/src/chat/member_sync.c
@@ -1344,57 +1344,63 @@ enum ms_author_status member_sync_author_key(struct UTUN_INSTANCE* inst, const c
     if (rc != SQLITE_ROW) goto done;
     int x_bytes = sqlite3_column_bytes(st, 0), ed_bytes = sqlite3_column_bytes(st, 1);
     int tree_bytes = sqlite3_column_bytes(st, 3), join_bytes = sqlite3_column_bytes(st, 4);
-    if (sqlite3_errcode(db) == SQLITE_NOMEM) goto done;
+    if (sqlite3_errcode(db) == SQLITE_NOMEM) { rc = SQLITE_NOMEM; goto done; }
     status = MS_AUTHOR_INVALID;
     reason = "invalid member fields";
     if (x_bytes != 32 || ed_bytes != 32 || (tree_bytes != 0 && tree_bytes != 64)
         || (join_bytes != 0 && join_bytes != 64)) goto done;
-    if (!tree_bytes || !join_bytes || sqlite3_column_int64(st, 5) <= 0
-        || _sig_is_zero64(sqlite3_column_blob(st, 3)) || _sig_is_zero64(sqlite3_column_blob(st, 4))) {
-        status = MS_AUTHOR_PENDING; reason = "join or invitation pending"; goto done;
-    }
     struct ms_member_rec member = { .node_id = author, .x25519 = sqlite3_column_blob(st, 0),
         .ed25519 = sqlite3_column_blob(st, 1), .signed_by = (uint64_t)sqlite3_column_int64(st, 2),
         .signature = sqlite3_column_blob(st, 3), .join_sig = sqlite3_column_blob(st, 4),
         .join_ts = (uint64_t)sqlite3_column_int64(st, 5) };
+    if (sqlite3_errcode(db) == SQLITE_NOMEM || !member.x25519 || !member.ed25519
+        || (tree_bytes && !member.signature) || (join_bytes && !member.join_sig)) {
+        status = MS_AUTHOR_ERROR; reason = "member column allocation"; rc = SQLITE_NOMEM; goto done;
+    }
+    if (!tree_bytes || !join_bytes || !member.join_ts
+        || _sig_is_zero64(member.signature) || _sig_is_zero64(member.join_sig)) {
+        status = MS_AUTHOR_PENDING; reason = "join or invitation pending"; goto done;
+    }
     reason = "node_id/X25519 mismatch";
     uint64_t derived = sc_derive_node_id_from_pubkey(member.x25519);
-    if (!derived) { status = MS_AUTHOR_ERROR; reason = "identity digest"; goto done; }
+    if (!derived) { status = MS_AUTHOR_ERROR; reason = "identity digest"; rc = SC_ERR_CRYPTO; goto done; }
     if (derived != author) goto done;
     uint8_t trusted[32], x[32], ed[32], body[112];
     reason = "trusted Ed25519 key unavailable";
     int lookup = topo_node_sqlite_get_ed25519_pubkey(db, author, trusted);
     if (lookup != 0) {
-        status = lookup == TOPO_SQLITE_LOOKUP_MISSING ? MS_AUTHOR_PENDING : MS_AUTHOR_ERROR; goto done;
+        status = lookup == TOPO_SQLITE_LOOKUP_MISSING ? MS_AUTHOR_PENDING : MS_AUTHOR_ERROR; rc = lookup; goto done;
     }
     reason = "trusted Ed25519 key mismatch";
     if (memcmp(trusted, member.ed25519, 32)) goto done;
     reason = "channel keys unavailable";
     lookup = topo_node_sqlite_channel_get(db, channel, NULL, 0, NULL, x, ed, NULL);
     if (lookup != 0) {
-        status = lookup == TOPO_SQLITE_LOOKUP_MISSING ? MS_AUTHOR_PENDING : MS_AUTHOR_ERROR; goto done;
+        status = lookup == TOPO_SQLITE_LOOKUP_MISSING ? MS_AUTHOR_PENDING : MS_AUTHOR_ERROR; rc = lookup; goto done;
     }
     reason = "invalid join signature";
     int bytes = member_sync_build_join_msg(x, ed, author, member.x25519, member.join_ts, body, sizeof(body));
     if (bytes != 112) { status = MS_AUTHOR_ERROR; reason = "join message build"; goto done; }
     int signature = sc_ed25519_verify(member.ed25519, body, bytes, member.join_sig);
     if (signature != SC_OK) {
-        status = signature == SC_ERR_AUTH_FAILED ? MS_AUTHOR_INVALID : MS_AUTHOR_ERROR; goto done;
+        status = signature == SC_ERR_AUTH_FAILED ? MS_AUTHOR_INVALID : MS_AUTHOR_ERROR; rc = signature; goto done;
     }
     reason = "invitation verification";
     signature = member_sync_verify_signature(db, channel, &member);
     if (signature != 1) {
         status = signature == MS_VERIFY_DEFERRED ? MS_AUTHOR_PENDING
             : signature == MS_VERIFY_ERROR ? MS_AUTHOR_ERROR : MS_AUTHOR_INVALID;
+        rc = signature;
         goto done;
     }
     memcpy(verified_key, member.ed25519, 32); status = MS_AUTHOR_ACTIVE; reason = "verified";
-done:
-    if (sqlite3_finalize(st) != SQLITE_OK) { status = MS_AUTHOR_ERROR; reason = "member finalize"; }
+done:;
+    int final = sqlite3_finalize(st);
+    if (final != SQLITE_OK) { status = MS_AUTHOR_ERROR; reason = "member finalize"; rc = final; }
     if (status == MS_AUTHOR_ACTIVE) memcpy(key, verified_key, 32);
     if (status == MS_AUTHOR_ERROR) DEBUG_ERROR(DEBUG_CATEGORY_MEMBER_SYNC,
-        "author verification failed ch=%s node=%016llx reason=%s rc=%d: %s",
-        channel, (unsigned long long)author, reason, rc, sqlite3_errmsg(db));
+        "author verification failed ch=%s node=%016llx reason=%s result=%d",
+        channel, (unsigned long long)author, reason, rc);
     else if (status == MS_AUTHOR_INVALID) DEBUG_WARN(DEBUG_CATEGORY_MEMBER_SYNC,
         "author invalid ch=%s node=%016llx reason=%s", channel, (unsigned long long)author, reason);
     else if (status != MS_AUTHOR_ACTIVE) DEBUG_DEBUG(DEBUG_CATEGORY_MEMBER_SYNC,