Worked on the cmu-db/bustub repository to enhance tombstone handling within the BPlusTree data structure, focusing on improving the reliability of tombstone coalescing. Introduced a NumTombs template parameter to the LeafPage type alias, enabling more robust management of tombstones and reducing the risk of index inconsistencies in production environments. Updated the TombstoneCoalesceTest to minimize reliance on page IDs and to better verify index correctness, thereby strengthening test reliability. Applied minor formatting changes to improve code readability and maintainability. Utilized C++ with an emphasis on algorithm design, data structures, and unit testing throughout the development process.