优化@批处理窗口：每10分钟仅处理10-20分钟前消息

- 调整待抽取@查询逻辑：默认仅扫描 timestamp 在 [NOW-20m, NOW-10m) 的消息

- 保留 mentioned_user_ids 为空才处理的条件，处理过自动跳过

- 更新 MessageStorage 与系统任务调用参数，统一使用窗口化批处理配置

- 增加窗口参数兜底修正，避免错误配置导致全量扫描

db/message_storage.py

@@ -133,15 +133,26 @@ class MessageStorageDB(BaseDBOperator):
 
         return result
 
-    def get_pending_mention_extract_messages(self, limit: int = 200, max_age_days: int = 7) -> List[Dict]:
+    def get_pending_mention_extract_messages(
+        self,
+        limit: int = 200,
+        window_start_minutes: int = 20,
+        window_end_minutes: int = 10,
+    ) -> List[Dict]:
         """获取待处理 @ 抽取的消息批次。
 
         筛选规则：
         1. 群消息；
         2. mentioned_user_ids 为空（表示还未处理）；
         3. message_xml 非空；
-        4. 时间在 max_age_days 窗口内，避免扫描无限历史。
+        4. 仅处理固定时间窗口（默认：10~20分钟前），降低扫描压力与热数据竞争。
         """
+        # 兜底修正窗口参数，确保窗口有效：start > end >= 0
+        start_m = max(int(window_start_minutes), 1)
+        end_m = max(int(window_end_minutes), 0)
+        if start_m <= end_m:
+            start_m = end_m + 10
+
         sql = """
         SELECT message_id, group_id, sender, message_xml, timestamp
         FROM messages
@@ -150,13 +161,19 @@ class MessageStorageDB(BaseDBOperator):
           AND (mentioned_user_ids IS NULL OR mentioned_user_ids = '')
           AND message_xml IS NOT NULL
           AND message_xml <> ''
-          AND timestamp >= DATE_SUB(NOW(), INTERVAL %s DAY)
+          AND timestamp >= DATE_SUB(NOW(), INTERVAL %s MINUTE)
+          AND timestamp < DATE_SUB(NOW(), INTERVAL %s MINUTE)
         ORDER BY timestamp ASC
         LIMIT %s
         """
-        return self.execute_query(sql, (max_age_days, limit)) or []
+        return self.execute_query(sql, (start_m, end_m, limit)) or []
 
-    def process_pending_mentions(self, batch_size: int = 200, max_age_days: int = 7) -> Dict[str, int]:
+    def process_pending_mentions(
+        self,
+        batch_size: int = 200,
+        window_start_minutes: int = 20,
+        window_end_minutes: int = 10,
+    ) -> Dict[str, int]:
         """批量处理待抽取 @ 的消息，并同步社交图数据。
 
         返回统计：
@@ -165,7 +182,11 @@ class MessageStorageDB(BaseDBOperator):
         - with_mentions: 提取到 @ 的消息条数
         - failed: 失败条数
         """
-        rows = self.get_pending_mention_extract_messages(limit=batch_size, max_age_days=max_age_days)
+        rows = self.get_pending_mention_extract_messages(
+            limit=batch_size,
+            window_start_minutes=window_start_minutes,
+            window_end_minutes=window_end_minutes,
+        )
         if not rows:
             return {"total": 0, "processed": 0, "with_mentions": 0, "failed": 0}