diff --git a/services/mcp_router.py b/services/mcp_router.py
index 437b581..b99315f 100644
--- a/services/mcp_router.py
+++ b/services/mcp_router.py
@@ -196,7 +196,7 @@ def _async_write_mcp_call(
             finally:
                 session.close()
         except Exception:
-            pass  # 永不影響主流程
+            logger.debug("[MCPRouter] async DB writer bootstrap failed", exc_info=True)
 
     threading.Thread(target=_writer, daemon=True).start()