code: def defaults(cls):
      return dict(
          token_id="",
          expiration="",
          user=None,
          is_local_user=False,
      )
  
file_path: labml/app/server/labml_app/db/app_token.py
imports: import time
  from uuid import uuid4
  from labml_db import Model, Key, Index
  from .None import user
label_desc: Use image node_id 1 for calling the AppToken obj's underlying member method code with example usage: obj.defaults(cls) and returns: dict