更新

backend/utils/received_message_log.py

@@ -8,6 +8,7 @@ from typing import Optional
 
 from models.database import AsyncSessionLocal
 from models.models import ReceivedMessageLog
+from utils.log_limits import bound_raw_message_log_content
 
 logger = logging.getLogger("received_message_log")
 
@@ -23,8 +24,9 @@ async def record_received_message(
     message_type: Optional[int] = None,
     server_message_id: Optional[str] = None,
 ) -> None:
-    # 原样落库：不做 strip / parse / serialize，空字符串也记录
-    store_content = raw_content if raw_content is not None else ""
+    # The live message object remains untouched for matching/replying. Only
+    # this diagnostic copy is bounded before persistence.
+    store_content = bound_raw_message_log_content(raw_content)
 
     async with AsyncSessionLocal() as db:
         try: