code: def __init__(
      self,
      db_url: str,
      token: Optional[str] = None,
      model: Optional[T] = None,
  ) -> None:
      self.db_url = db_url
      self.model = model
      self.token = token or ""
      self._session = None
  
file_path: pytorch-lightning/src/lightning/app/components/database/client.py
imports: from typing import Any, Dict, List, Optional, Type, TypeVar
  import requests
  from requests import Session
  from requests.adapters import HTTPAdapter
  from urllib3.util.retry import Retry
  from lightning.app.components.database.utilities import _GeneralModel
label_desc: Use image node_id 1 to create a new DatabaseClient object  with example: obj = DatabaseClient(db_url, token, model)