code: def lock_resource_for_update(cls, resource_id, db_session):
          
          db_session = get_db_session(db_session)
          query = db_session.query(cls.model)
          query = query.filter(cls.model.resource_id == resource_id)
          query = query.with_for_update()
          return query.first()
docs: Selects resource for update - locking access for other transactions
  
          :param resource_id:
          :param db_session:
          :return: