During January 2025, Berry developed UI-based primary key management for master-slave merge operations in the tapdata/tapdata repository. This work allowed users to set primary keys directly through the interface, addressing a key usability gap. Berry refactored the backend Java logic to improve error handling and user-facing messages when primary keys or unique indexes were missing, making troubleshooting more intuitive. The changes included expanded unit testing to cover edge cases around missing keys and indexes, enhancing reliability. By aligning the implementation with the Tap 5689 commit, Berry ensured consistency with existing merge flows, demonstrating depth in backend development and data engineering.