docs: def post(self):
          """Create bucket."""
          with db.session.begin_nested():
              bucket = Bucket.create(
                  storage_class=current_app.config[
                      'FILES_REST_DEFAULT_STORAGE_CLASS'
                  ],
              )
          db.session.commit()
          return self.make_response(
              data=bucket,
              context={
                  'class': Bucket,
              }
          )