feat(chat): 单向聊天可二次激活 单向聊天可二次激活，未删除方聊天消息保留，双向删除后记录清空

core/routers/chat/services.py

@@ -11,7 +11,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import aliased, selectinload
 
 from core.base.exceptions import WebsocketTooManyRequests
-from core.db.models import User, Chat, ReadStatus, Message, ChatParticipant
+from core.db.models import User, Chat, Message, ChatParticipant
 from core.routers.auth.schema import LoginUser
 from core.utils.helper import format_date
 
@@ -44,7 +44,7 @@ async def get_user_active_direct_chats(
 async def get_chat_unread_messages_count(db_session: AsyncSession, login_user: LoginUser, chats):
     """查询未读消息的预览"""
     # 查询消息情况
-    read_status_alias = aliased(ReadStatus)
+    read_status_alias = aliased(ChatParticipant)
     query = (
         select(Message.chat_id, func.count().label("message_count"))
         .join(