take db from env

persistence.py

@@ -6,11 +6,10 @@ from sqlalchemy.orm import declarative_base
 from sqlalchemy.exc import SQLAlchemyError
 
 
-DB_URL = 'postgresql://default:lyzegA2r0ESO@ep-dawn-fire-a1i3ytre-pooler.ap-southeast-1.aws.neon.tech/verceldb?sslmode=require'
+DATABASE_URL = os.environ.get('DATABASE_URL')
+engine = create_engine(DATABASE_URL)
 
 
-engine = create_engine(DB_URL)
-
 def get_df_from_csv(csv_file_path):
     df = pd.read_csv(csv_file_path)
     return df