Method append

backend/persistence/event_log.py:27–36

(self, event_type, request_id=None, **fields)

        self._buffer = []  # 内存镜像（便于查询/测试）

    def append(self, event_type, request_id=None, **fields):
        record = {"ts": time.time(), "type": event_type, "request_id": request_id}
        record.update(fields)
        line = json.dumps(record, ensure_ascii=False)
        with self._lock:
            self._buffer.append(record)
            if self.path:
                with open(self.path, "a", encoding="utf-8") as f:
                    f.write(line + "\n")
        return record

    def events(self, request_id=None, event_type=None):
        with self._lock: