docs: def save(self, status=None):
          """Save object to persistent storage."""
          if self.model is None:
              raise WorkflowsMissingModel()
  
          with db.session.begin_nested():
              self.model.modified = datetime.now()
              if status is not None:
                  self.model.status = status
  
              if self.model.extra_data is None:
                  self.model.extra_data = dict()
              flag_modified(self.model, 'extra_data')
              db.session.merge(self.model)