code: def DeleteAllFlowRequestsAndResponses(self, client_id, flow_id):
      
      flow_key = (client_id, flow_id)
      try:
        self.flows[flow_key]
      except KeyError:
        raise db.UnknownFlowError(client_id, flow_id)
  
      try:
        del self.flow_requests[flow_key]
      except KeyError:
        pass
  
      try:
        del self.flow_responses[flow_key]
      except KeyError:
        pass
docs: Deletes all requests and responses for a given flow from the database.