code: def cleanup_datastore(self):
      
      print_header('CLEANING UP ENTIRE DATASTORE')
      kinds_to_delete = [u'Submission', u'SubmissionType',
                         u'DatasetImage', u'DatasetBatch',
                         u'AdversarialImage', u'AdversarialBatch',
                         u'Work', u'WorkType',
                         u'ClassificationBatch']
      keys_to_delete = [e.key for k in kinds_to_delete
                        for e in self.datastore_client.query_fetch(kind=k)]
      self._cleanup_keys_with_confirmation(keys_to_delete)
docs: Cleans up datastore and deletes all information about current round.