Add indexes and pagination to improve app performance

app/__init__.py

@@ -33,7 +33,7 @@ def create_app():
     # Set up the user_loader function
     @login_manager.user_loader
     def load_user(user_id):
-        return User.query.get(int(user_id))  # Query the User model by ID
+        return db.session.get(User, int(user_id))
 
     # Register blueprints
     from app.routes.auth import auth