code: def view_cleanup(self):
          
          url = '/'.join((self.database_url, '_view_cleanup'))
          resp = self.r_session.post(
              url,
              headers={'Content-Type': 'application/json'}
          )
          resp.raise_for_status()
  
          return response_to_json_dict(resp)
docs: Removes view files that are not used by any design document in the
          remote database.
  
          :returns: View cleanup status in JSON format