Update app.py

app.py

@@ -7,7 +7,7 @@ from sqlalchemy.orm import sessionmaker
 os.environ["DB_PASSWORD"]
 os.environ["DB_HOST"] 
 os.environ["DB_PORT"]
-os.environ["DB]
+os.environ["DB"]
 # Construct the connection string
 SQL_DATABASE_URL = f'mssql+pymssql://Benedette:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB}'
 # Create an engine instance