Update auth.py

auth.py

@@ -25,7 +25,7 @@ logger.setLevel(logging.INFO)
 
 # MongoDB setup for user management
 password = quote_plus(os.getenv("MONGO_PASSWORD"))
-MONGO_URL = os.getenv("MONGO_ENDPOINT").replace("${PASSWORD}", password)
+MONGO_URL = os.getenv("CONNECTION_STRING").replace("${PASSWORD}", password)
 client = MongoClient(MONGO_URL)
 db = client.users_database
 users_collection = db.users