Method trim

backend/persistence/event_log.py:47–55

仅保留最近 max_events 条事件（内存与文件同步），控制存储增长。

(self, max_events)

        return items

    def trim(self, max_events):
        """仅保留最近 max_events 条事件（内存与文件同步），控制存储增长。"""
        with self._lock:
            self._buffer = self._buffer[-max_events:]
            if self.path:
                with open(self.path, "w", encoding="utf-8") as f:
                    for rec in self._buffer:
                        f.write(json.dumps(rec, ensure_ascii=False) + "\n")
        return len(self._buffer)

    @staticmethod
    def read_file(path):