code: def __init__(self):
      self.pool: Optional[aiomysql.Pool] = None
      self.connection_release_task_manager: Optional[
          BackgroundTaskManager
      ] = None
      self.async_exit_stack = contextlib.AsyncExitStack()
  
imports: import asyncio
  import contextlib
  import functools
  import logging
  import os
  import ssl
  import traceback
  from typing import Any, AsyncIterator, Awaitable, Callable, Dict, Optional, TypeVar
  import aiomysql
  import aiomysql.utils
  import kubernetes_asyncio.client
  import kubernetes_asyncio.config
  import pymysql
  from typing_extensions import Concatenate, ParamSpec
  from gear.metrics import DB_CONNECTION_QUEUE_SIZE, SQL_TRANSACTIONS, PrometheusSQLTimer
  from hailtop.aiotools import BackgroundTaskManager
  from hailtop.auth.sql_config import SQLConfig
  from hailtop.config import get_deploy_config
  from hailtop.utils import first_extant_file, sleep_before_try
label_desc: Use image node_id 1 to create a new Database object  with example: obj = Database()