code: def defaults(cls):
      return dict(
          computer_uuid="",
          sessions=set(),
          active_runs=set(),
          deleted_runs=set(),
          last_online=None,
      )
  
file_path: labml/app/server/labml_app/db/computer.py
imports: import time
  from typing import List, Dict, Set
  from labml_db import Model, Index
label_desc: Use image node_id 1 for calling the Computer obj's underlying member method code with example usage: obj.defaults(cls) and returns: dict