- Implemented URL parameters to switch between add and update modes.
- Enhanced XML loading from a remote URL.
- Added logging for updated products with a daily log file.
- Improved product update logic to change default category if necessary.
- Refactored functions for better readability and performance.
- Ensured proper type casting for database interactions.
- Added functionality to create or update product combinations.
- Improved user feedback with HTML output for added products and combinations.