Add updated_at and created_at to Playlist model

Introduces created_at and updated_at fields to the Playlist model for tracking creation and modification times. Refactors room user removal logic to handle owner transfer and participant count updates more robustly. Updates room query logic for more accurate filtering by category and status. Adds migration stubs for updated_at column in room playlists.

app/router/lio.py

@@ -438,51 +438,109 @@ async def remove_user_from_room(
     timestamp: str = "",
 ) -> Dict[str, Any]:
     """Remove a user from a multiplayer room."""
-    """ try: """
-    # Verify request signature
-    body = await request.body()
-    # 直接用内部获取的时间戳
-    now = utcnow()
-    if not verify_request_signature(request, timestamp, body):
-        raise HTTPException(
-            status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Invalid request signature"
+    try:
+        # Verify request signature
+        body = await request.body()
+        now = utcnow()
+        if not verify_request_signature(request, timestamp, body):
+            raise HTTPException(
+                status_code=status.HTTP_401_UNAUTHORIZED,
+                detail="Invalid request signature"
+            )
+
+        # 检查房间是否存在
+        room_query = await db.fetch_one(
+            select(Room.owner_id, Room.status, Room.participant_count)
+            .where(col(Room.id) == room_id)
+        )
+        
+        if not room_query:
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail="Room not found"
+            )
+        
+        room_owner_id = room_query['owner_id']
+        room_status = room_query['status']
+        current_participant_count = room_query['participant_count']
+
+        # 检查用户是否在房间中
+        participant_query = await db.fetch_one(
+            select(RoomParticipatedUser.id)
+            .where(
+                col(RoomParticipatedUser.room_id) == room_id,
+                col(RoomParticipatedUser.user_id) == user_id,
+                col(RoomParticipatedUser.left_at).is_(None)
+            )
+        )
+        
+        if not participant_query:
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail="User is not in this room"
+            )
+
+        # 标记用户离开房间
+        await db.execute(
+            update(RoomParticipatedUser)
+            .where(
+                col(RoomParticipatedUser.room_id) == room_id,
+                col(RoomParticipatedUser.user_id) == user_id,
+                col(RoomParticipatedUser.left_at).is_(None)
+            )
+            .values(left_at=now)
         )
 
-    # 更新房间结束时间
-    await db.execute(
-        update(Room)
-        .where(col(Room.id) == room_id)
-        .values(ends_at=now, status=RoomStatus.IDLE)
-    )
+        # 检查是否是房主离开
+        if user_id == room_owner_id:
+            # 房主离开，查找其他参与者来转让房主权限
+            remaining_result = await db.execute(
+                select(RoomParticipatedUser.user_id)
+                .where(
+                    col(RoomParticipatedUser.room_id) == room_id,
+                    col(RoomParticipatedUser.user_id) != user_id,
+                    col(RoomParticipatedUser.left_at).is_(None)
+                )
+                .order_by(col(RoomParticipatedUser.joined_at))  # 按加入时间排序，选择最早的
+            )
+            remaining_participants = remaining_result.all()
+            
+            if remaining_participants:
+                # 将房主权限转让给最早加入的用户
+                new_owner_id = remaining_participants[0][0]  # 获取 user_id
+                await db.execute(
+                    update(Room)
+                    .where(col(Room.id) == room_id)
+                    .values(owner_id=new_owner_id)
+                )
+                
+                # 记录房主转让日志（可选）
+                # logger.info(f"Room {room_id} ownership transferred from {user_id} to {new_owner_id}")
+            else:
+                # 没有其他参与者，房间应该被标记为结束
+                await db.execute(
+                    update(Room)
+                    .where(col(Room.id) == room_id)
+                    .values(
+                        ends_at=now, 
+                        status=RoomStatus.IDLE,
+                        participant_count=0
+                    )
+                )
+                await db.commit()
+                return {"success": True, "room_ended": True}
 
-    # 标记所有参与者已离开
-    await db.execute(
-        update(RoomParticipatedUser)
-        .where(col(RoomParticipatedUser.room_id) == room_id, col(RoomParticipatedUser.left_at).is_(None))
-        .values(left_at=now)
-    )
+        # 更新房间参与者数量
+        await _update_room_participant_count(db, room_id)
+        
+        await db.commit()
+        return {"success": True, "room_ended": False}
 
-    # 人数归零
-    await db.execute(
-        update(Room)
-        .where(col(Room.id) == room_id)
-        .values(participant_count=0)
-    )
-
-    await db.commit()
-
-
-    # Update participant count
-    await _update_room_participant_count(db, room_id)
-    
-    await db.commit()
-    return {"success": True}
-
-    """ except HTTPException:
+    except HTTPException:
         raise
     except Exception as e:
+        await db.rollback()
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
             detail=f"Failed to remove user from room: {str(e)}"
-        ) """
+        )