diff --git a/core/database.py b/core/database.py
index 3323ccc..cd9680c 100644
--- a/core/database.py
+++ b/core/database.py
@@ -68,7 +68,7 @@ class Database:
             )
         """)
         
-        # 游戏状态表
+        # 游戏状态表（新增 confirmed 列用于标记可回收状态）
         cursor.execute("""
             CREATE TABLE IF NOT EXISTS game_states (
                 id INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -78,9 +78,18 @@ class Database:
                 state_data TEXT,
                 created_at INTEGER NOT NULL,
                 updated_at INTEGER NOT NULL,
+                confirmed INTEGER DEFAULT 0,
                 UNIQUE(chat_id, user_id, game_type)
             )
         """)
+
+        # 幂等迁移：为已有表增加 confirmed 列
+        try:
+            cursor.execute("ALTER TABLE game_states ADD COLUMN confirmed INTEGER DEFAULT 0")
+            logger.info("为 game_states 增加 confirmed 列")
+        except Exception:
+            # 列已存在或不可变更时忽略
+            pass
         
         # 创建索引
         cursor.execute("""
@@ -253,14 +262,31 @@ class Database:
         state_json = json.dumps(state_data, ensure_ascii=False)
         
         cursor.execute("""
-            INSERT INTO game_states (chat_id, user_id, game_type, state_data, created_at, updated_at)
-            VALUES (?, ?, ?, ?, ?, ?)
+            INSERT INTO game_states (chat_id, user_id, game_type, state_data, created_at, updated_at, confirmed)
+            VALUES (?, ?, ?, ?, ?, ?, 0)
             ON CONFLICT(chat_id, user_id, game_type) 
-            DO UPDATE SET state_data = ?, updated_at = ?
-        """, (chat_id, user_id, game_type, state_json, current_time, current_time, 
-              state_json, current_time))
+            DO UPDATE SET state_data = excluded.state_data,
+                          updated_at = excluded.updated_at,
+                          confirmed = 0
+        """, (chat_id, user_id, game_type, state_json, current_time, current_time))
         
         logger.debug(f"保存游戏状态: chat_id={chat_id}, user_id={user_id}, game_type={game_type}")
+
+    def confirm_game_state(self, chat_id: int, user_id: int, game_type: str):
+        """标记游戏状态为已确认（可由清理器删除）
+        
+        Args:
+            chat_id: 会话ID
+            user_id: 用户ID
+            game_type: 游戏类型
+        """
+        cursor = self.conn.cursor()
+        current_time = int(time.time())
+        cursor.execute(
+            "UPDATE game_states SET confirmed = 1, updated_at = ? WHERE chat_id = ? AND user_id = ? AND game_type = ?",
+            (current_time, chat_id, user_id, game_type)
+        )
+        logger.debug(f"确认游戏状态: chat_id={chat_id}, user_id={user_id}, game_type={game_type}")
     
     def delete_game_state(self, chat_id: int, user_id: int, game_type: str):
         """删除游戏状态
@@ -286,8 +312,9 @@ class Database:
         cursor = self.conn.cursor()
         cutoff_time = int(time.time()) - timeout
         
+        # 仅删除已确认（confirmed=1）的旧会话，避免误删进行中的长时任务
         cursor.execute(
-            "DELETE FROM game_states WHERE updated_at < ?",
+            "DELETE FROM game_states WHERE confirmed = 1 AND updated_at < ?",
             (cutoff_time,)
         )
         deleted = cursor.rowcount
@@ -413,11 +440,15 @@ class Database:
             # 确保用户存在
             self.get_or_create_user(user_id)
             
-            # 更新用户积分
+            # 更新用户积分（不触碰 last_checkin_date）：
+            # 若不存在则插入；存在则 points += ? 且更新 updated_at
             cursor.execute("""
-                INSERT OR REPLACE INTO user_points (user_id, points, created_at, updated_at)
-                VALUES (?, COALESCE((SELECT points FROM user_points WHERE user_id = ?), 0) + ?, ?, ?)
-            """, (user_id, user_id, points, current_time, current_time))
+                INSERT INTO user_points (user_id, points, created_at, updated_at)
+                VALUES (?, ?, ?, ?)
+                ON CONFLICT(user_id) DO UPDATE SET
+                    points = user_points.points + excluded.points,
+                    updated_at = excluded.updated_at
+            """, (user_id, points, current_time, current_time))
             
             logger.info(f"用户 {user_id} 成功获得 {points} 积分，来源：{source}")
             return True