During this period, work centered on enhancing the Linux Perf plugin within the google/perfetto repository to improve callstack sampling visibility. The developer implemented a feature that displays the source file, line number, and mapping information for callstacks, requiring updates across backend data flow, SQL queries, and UI rendering. Using SQL and TypeScript, they optimized queries to fetch new fields and adjusted UI metric definitions to support the expanded data. The integration was delivered end-to-end with minimal impact on user experience and prepared for QA review, demonstrating a focus on performance analysis, SQL query optimization, and UI development in a production environment.