Worked on the novuhq/novu repository to address data integrity issues during database migrations, focusing on backend development and database migration using TypeScript. Delivered a targeted bug fix that ensures the subscriber deduplication script is reliably triggered at the end of migration processes, directly invoking removeDuplicatedSubscribers to prevent duplicate subscriber records. This approach reduced the risk of data inconsistency and improved the reliability of subscriber data for downstream campaign operations. The change was minimal and well-scoped, designed with a clear rollback path to minimize risk. No new features were added during this period, with efforts concentrated on stabilizing migration workflows.