code: def forwards(self, orm):
          "Write your forwards methods here."
          orm['avocado.DataField'].objects.filter(app_name='samples', model_name='cohort',
              field_name__in=['investigator', 'notes']).delete(f forwards(self, orm):
          "Write your forwards methods here."
          orm['avocado.DataField'].objects.filter(app_name='samples', model_name='cohort',
              field_name__in=['investigator', 'notes']).delete()
docs: Write your forwards methods here.