fixed tests env setup

app.py

@@ -4,10 +4,10 @@ from flask_bootstrap import Bootstrap5
 from models import db, Feature
 
 app = Flask(__name__)
-db_user = os.getenv('DB_USER', 'postgres')
-db_pass = os.getenv('DB_PASS', 'password')  # Fallback; overridden by env
-db_name = os.getenv('DB_NAME', 'demo_db')
-app.config['SQLALCHEMY_DATABASE_URI'] = f'postgresql://{db_user}:{db_pass}@db:5432/{db_name}'
+db_user = os.getenv('DB_USER')
+db_pass = os.getenv('DB_PASS')
+db_name = os.getenv('DB_NAME')
+app.config['SQLALCHEMY_DATABASE_URI'] = f'postgresql://{db_user}:{db_pass}@db:5432/{db_name}' if db_user else 'sqlite:///:memory:'  # Fallback only if no env (for tests)
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 
 bootstrap = Bootstrap5(app)
@@ -16,6 +16,6 @@ db.init_app(app)
 @app.route('/')
 def index():
     with app.app_context():
-        Feature.seed_db()  # Seed on first load if empty
+        Feature.seed_db()
         features = Feature.query.all()
     return render_template('index.html', features=features)