code: def forwards(self, orm):
          "Write your forwards methods here."
          orm['samples.Cohort'].objects.filter(autocreated=True, batch__isnull=False).delete(f forwards(self, orm):
          "Write your forwards methods here."
          orm['samples.Cohort'].objects.filter(autocreated=True, batch__isnull=False).delete()
docs: Write your forwards methods here.