code: def get(identifier: str) -> Optional[User]:
      user_key = UserIndex.get(identifier)
  
      if user_key:
          return user_key.load()
  
      return None
  
imports: import time
  from labml_db import Model, Key, Index
  from typing import List, Dict, Optional, Set, Any
  from .None import project
  from ..None import utils
  from ..utils import gen_token
label_desc: Use image node_id 3 for calling a global function with example usage: get(identifier) and returns: None, user_key