Use client-side validation in QML (e.g., IntValidator, DoubleValidator) for immediate input checks. After that, call a C++ Q_INVOKABLE method to perform server-side validation (e.g., check for unique name/image in the database). Ensure the database check is asynchronous to avoid blocking the UI, and provide feedback if the check fails (e.g., show an error message if the name/image isn't unique). This ensures both local and database validation while maintaining a smooth user experience.