1. BACK UP SITE AND DATABASE.
2. Apply DATABASE_FIX_RUN_ONCE.sql in phpMyAdmin SQL tab to the EXISTING database (not a fresh import). Do not run twice.
3. Upload application ZIP files, preserving .env and storage data.
4. Clear Laravel views/cache: php artisan optimize:clear (if CLI available).
5. Verify purchase receiving and manager discount with a test order.
Changes have not been live tested.