During October 2024, Duan Mengmeng focused on enhancing the reliability of scheduled tasks in the apache/cloudberry repository by addressing a critical bug in pg_cron’s timezone handling. Leveraging expertise in backend development, configuration management, and database internals, Duan introduced assign_task_timezone and show_task_timezone hooks in C to isolate the task_timezone GUC from system-wide settings. This approach ensured that scheduled tasks maintained accurate timezone behavior across different environments, reducing the risk of mis-scheduled jobs due to system timezone changes. The work demonstrated a deep understanding of database configuration and contributed to more predictable, multi-tenant scheduling in production deployments.