code: def set_synchronous_standby(self, name):
          
          if name and name != '*':
              name = quote_ident(name)
          if name != self._synchronous_standby_names:
              if name is None:
                  self._server_parameters.pop('synchronous_standby_names', None)
              else:
                  self._server_parameters['synchronous_standby_names'] = name
              self._synchronous_standby_names = name
              if self.state == 'running':
                  self._write_postgresql_conf()
                  self.reload()
docs: Sets a node to be synchronous standby and if changed does a reload for PostgreSQL.