During November 2024, Huuquoc99 worked on the DATN_107 repository, focusing on backend development and database management to enhance order processing. They implemented a feature that deducts inventory stock from the database upon successful order placement, supporting both authenticated and guest users. The solution introduced a centralized function, deductStockProduct, to manage product variant quantities and maintain inventory accuracy. By linking stock changes to a specific commit for traceability, Huuquoc99 improved data integrity and order fulfillment reliability. The work, developed in PHP, demonstrated a targeted approach to aligning stock levels with completed orders, addressing a core operational requirement without bug fixes.