fix(chat): retain SQL error codes when SQLite supplies no message

src/chat/chat_core.c

@@ -61,7 +61,8 @@ static int db_exec(struct chat_core_ctx* cc, const char* sql) {
     char* err = NULL;
     int rc = sqlite3_exec(cc->db, sql, NULL, NULL, &err);
     if (rc != SQLITE_OK) {
-        DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "%s: sql error: %s", CC_ID, err);
+        DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "%s: SQL rc=%d (%s) statement=%.120s: %s", CC_ID,
+            rc, sqlite3_errstr(rc), sql, err ? err : sqlite3_errmsg(cc->db));
         sqlite3_free(err);
     }
     return rc;