code: def cleanup_defenses(self):
      
      print_header('CLEANING UP DEFENSES DATA')
      work_ancestor_key = self.datastore_client.key('WorkType', 'AllDefenses')
      keys_to_delete = [
          e.key
          for e in self.datastore_client.query_fetch(kind=u'ClassificationBatch')
      ] + [
          e.key
          for e in self.datastore_client.query_fetch(kind=u'Work',
                                                     ancestor=work_ancestor_key)
      ]
      self._cleanup_keys_with_confirmation(keys_to_delete)
docs: Cleans up all data about defense work in current round.