增强@批处理执行日志，提升可观测性

- 增加定时@抽取任务开始/结束日志，输出窗口参数、处理条数与耗时

- 在DB批处理层记录查询命中、前3条样本明细、失败样本ID，便于快速排障

- 增加窗口参数异常修正日志，避免误配置导致行为不可见

- 在社交图增量写入处增加跳过/完成日志，明确是否产生新增@关系

db/message_storage.py

@@ -152,6 +152,10 @@ class MessageStorageDB(BaseDBOperator):
         end_m = max(int(window_end_minutes), 0)
         if start_m <= end_m:
             start_m = end_m + 10
+            self.LOG.warning(
+                f"@抽取窗口参数异常，已自动修正: window_start_minutes={window_start_minutes}, "
+                f"window_end_minutes={window_end_minutes}, 修正后=[NOW-{start_m}m, NOW-{end_m}m)"
+            )
 
         sql = """
         SELECT message_id, group_id, sender, message_xml, timestamp
@@ -166,7 +170,11 @@ class MessageStorageDB(BaseDBOperator):
         ORDER BY timestamp ASC
         LIMIT %s
         """
-        return self.execute_query(sql, (start_m, end_m, limit)) or []
+        rows = self.execute_query(sql, (start_m, end_m, limit)) or []
+        self.LOG.debug(
+            f"查询待抽取@消息: window=[NOW-{start_m}m, NOW-{end_m}m), limit={limit}, 命中={len(rows)}"
+        )
+        return rows
 
     def process_pending_mentions(
         self,
@@ -182,19 +190,30 @@ class MessageStorageDB(BaseDBOperator):
         - with_mentions: 提取到 @ 的消息条数
         - failed: 失败条数
         """
+        started_at = datetime.now()
+        self.LOG.info(
+            "开始执行@批处理: "
+            f"batch_size={batch_size}, window_start_minutes={window_start_minutes}, "
+            f"window_end_minutes={window_end_minutes}"
+        )
+
         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:
+            elapsed_ms = int((datetime.now() - started_at).total_seconds() * 1000)
+            self.LOG.info(f"@批处理结束: 命中0条, 耗时={elapsed_ms}ms")
             return {"total": 0, "processed": 0, "with_mentions": 0, "failed": 0}
 
         processed = 0
         with_mentions = 0
         failed = 0
+        # 记录少量失败样本，便于快速定位问题，不刷屏。
+        fail_samples: List[str] = []
 
-        for row in rows:
+        for idx, row in enumerate(rows, start=1):
             try:
                 message_id = str(row.get("message_id") or "").strip()
                 group_id = str(row.get("group_id") or "").strip()
@@ -223,16 +242,31 @@ class MessageStorageDB(BaseDBOperator):
                 processed += 1
                 if mentioned_user_ids:
                     with_mentions += 1
+                if idx <= 3:
+                    # 前3条打 debug 明细，便于确认当前批处理真实在工作。
+                    self.LOG.debug(
+                        f"@批处理样本[{idx}]: message_id={message_id}, group_id={group_id}, "
+                        f"sender={sender_id}, mentioned_count={len(mentioned_user_ids)}"
+                    )
             except Exception as e:
                 failed += 1
                 self.LOG.error(f"处理待抽取@消息失败: message_id={row.get('message_id')}, error={e}")
+                if len(fail_samples) < 5:
+                    fail_samples.append(str(row.get("message_id") or ""))
 
-        return {
+        elapsed_ms = int((datetime.now() - started_at).total_seconds() * 1000)
+        stats = {
             "total": len(rows),
             "processed": processed,
             "with_mentions": with_mentions,
             "failed": failed,
         }
+        self.LOG.info(
+            f"@批处理结束: total={stats['total']}, processed={stats['processed']}, "
+            f"with_mentions={stats['with_mentions']}, failed={stats['failed']}, 耗时={elapsed_ms}ms, "
+            f"fail_samples={fail_samples}"
+        )
+        return stats
 
     @staticmethod
     def _safe_parse_message_time(value) -> datetime:
@@ -318,6 +352,9 @@ class MessageStorageDB(BaseDBOperator):
             existed_ids = {str(r.get("mentioned_user_id") or "").strip() for r in existed_rows}
             newly_mentioned_ids = [uid for uid in clean_mentioned_ids if uid not in existed_ids]
             if not newly_mentioned_ids:
+                self.LOG.debug(
+                    f"社交图写入跳过(无新增@关系): message_id={message_id}, group_id={group_id}, sender={sender_id}"
+                )
                 return
 
             # 1) 写 @ 明细表：用于追溯“哪条消息 @ 了谁”。
@@ -391,6 +428,10 @@ class MessageStorageDB(BaseDBOperator):
             # 4) 回填 unique_interactors：针对本条消息受影响的用户实时重算“去重互动人数”。
             affected_user_ids = [sender_id, *newly_mentioned_ids]
             self._refresh_unique_interactors(stat_date, group_id, affected_user_ids)
+            self.LOG.debug(
+                f"社交图写入完成: message_id={message_id}, group_id={group_id}, sender={sender_id}, "
+                f"new_mentions={len(newly_mentioned_ids)}, affected_users={len(affected_user_ids)}"
+            )
         except Exception as e:
             # 社交图统计属于增强链路，不能反向影响主消息入库稳定性。
             self.LOG.error(f"写入社交图增量数据失败: {e}")