docs: def remove_expired_multipartobjects():
      """Remove expired multipart objects."""
      delta = current_app.config['FILES_REST_MULTIPART_EXPIRES']
      expired_dt = datetime.utcnow() - delta
  
      file_ids = []
      for mp in MultipartObject.query_expired(expired_dt):
          file_ids.append(str(mp.file_id))
          mp.delete()
  
      for fid in file_ids:
          remove_file_data.delay(fid)