docs: def WriteMessageHandlerRequests(self, requests):
      """Writes a list of message handler requests to the database."""
      now = rdfvalue.RDFDatetime.Now()
      for r in requests:
        flow_dict = self.message_handler_requests.setdefault(r.handler_name, {})
        cloned_request = r.Copy()
        cloned_request.timestamp = now
        flow_dict[cloned_request.request_id] = cloned_request