code: def __init__(
      self, db_pool, read_only, task_manager: BackgroundTaskManager
  ):
      self.db_pool = db_pool
      self.read_only = read_only
      self.tx: Optional["Transaction"] = None
      self.task_manager = task_manager
  
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 TransactionAsyncContextManager object  with example: obj = TransactionAsyncContextManager(db_pool, read_only, task_manager)