Releases a flow that the worker was processing to the database.

def ReleaseProcessedFlow(self, flow_obj):
    """Releases a flow that the worker was processing to the database."""
    key = (flow_obj.client_id, flow_obj.flow_id)
    next_id_to_process = flow_obj.next_request_to_process
    request_dict = self.flow_requests.get(key, {})
    if (next_id_to_process in request_dict and
        request_dict[next_id_to_process].needs_processing):
      return False

    self.UpdateFlow(
        flow_obj.client_id,
        flow_obj.flow_id,
        flow_obj=flow_obj,
        processing_on=None,
        processing_since=None,
        processing_deadline=None)
    return True