code: def create_savepoint(self, savepoint):
          
          if not self._platform.is_savepoints_supported():
              raise DBALConnectionError.savepoints_not_supported()
          self.ensure_connected()
          self._platform.create_savepoint(savepoint)
docs: Creates a new savepoint.
  
          :param savepoint: the name of the savepoint to create
          :raise: pydbal.exception.DBALConnectionError