code: def _add_config_root(self):
          
  
          try:
              self.session.query(Dataset).filter_by(id=ROOT_CONFIG_NAME).one()
              self.close_session()
          except NoResultFound:
              o = Dataset(
                  id=ROOT_CONFIG_NAME,
                  vid=ROOT_CONFIG_NAME_V,
                  name=ROOT_CONFIG_NAME,
                  vname=ROOT_CONFIG_NAME_V,
                  fqname='datasetroot-0.0.0~' + ROOT_CONFIG_NAME_V,
                  cache_key=ROOT_CONFIG_NAME,
                  version='0.0.0',
                  source=ROOT_CONFIG_NAME,
                  dataset=ROOT_CONFIG_NAME,
                  revision=1,
              )
              self.session.add(o)
              self.commit()
docs: Adds the root dataset, which holds configuration values for the database.