Upload router_messages.py

router_messages.py

@@ -35,7 +35,7 @@ async def publish_announcement(ann: SystemAnnouncement, current_user: str = Depe
         "type": "system",
         "from_user": current_user,  # 使用真实的管理员账号
         "from_name": "官方团队",
-        "from_avatar": ""
+        "from_avatar": "",
         "content": ann.content,
         "created_at": int(time.time())
     }