Update app.py

app.py

@@ -15,6 +15,7 @@ import io
 # Load environment variables
 load_dotenv()
 
+# Check for necessary environment variables
 required_env_vars = ['SF_USERNAME', 'SF_PASSWORD', 'SF_SECURITY_TOKEN']
 missing_vars = [var for var in required_env_vars if not os.getenv(var)]
 if missing_vars: