code: def requested_intervals(self, intervals):
          
          with switch_db(WorkflowStatusModel, db_alias='hyperstream'):
              workflow_statuses = WorkflowStatusModel.objects(workflow_id=self.workflow_id)
              if len(workflow_statuses) != 1:
                  workflow_status = WorkflowStatusModel(
                      workflow_id=self.workflow_id,
                      requested_intervals=[]
                  )
  
              else:
                  workflow_status = workflow_statuses[0]
  
              workflow_status.last_updated = utcnow()
              workflow_status.last_accessed = utcnow()
              workflow_status.requested_intervals = tuple(
                  map(lambda x: TimeIntervalModel(start=x.start, end=x.end), intervals))
  
              workflow_status.save()
docs: Set the requested intervals (to the database)
  
          :param intervals: The intervals
          :type intervals: TimeIntervals
          :return: None