Update _db_.py

_db_.py

@@ -1,8 +1,9 @@
 import psycopg2
 from psycopg2 import OperationalError
+import os
 
 # Neon database connection string
-CONN_STRING = "postgresql://neondb_owner:npg_b9ON1Scgpxqs@ep-empty-firefly-ab6s4t97-pooler.eu-west-2.aws.neon.tech/dev?sslmode=require&channel_binding=require"
+CONN_STRING = os.getenv("CONN_URL")
 
 def create_connection():
     """Create a connection to the Neon PostgreSQL database."""