docs: def delete(cls, object_version, key=None):
          """Delete tags.
  
          :param object_version: The object version instance or id.
          :param key: Key of the tag to delete.
              Default: delete all tags.
          """
          with db.session.begin_nested():
              q = cls.query.filter_by(
                  version_id=as_object_version_id(object_version))
              if key:
                  q = q.filter_by(key=key)
              q.delete()