Refactor main.py to use Redis connection from environment variable

main.py

@@ -3,13 +3,17 @@
 from db.session import create_all_tables_and_initialize_redis_instance
 from pydantic import ValidationError
 from starlette.middleware.base import BaseHTTPMiddleware
-from redis_db.redis_db import init_redis
 from api.v1 import (
     account_router,
     refunds_router,
     payment_method_router,
     transaction_router,
 )
+import os
+import redis
+
+REDIS_URL = os.getenv("REDIS_URL")
+client = redis.Redis.from_url(REDIS_URL)
 
 app = FastAPI(
     lifespan=create_all_tables_and_initialize_redis_instance,