Worked on the Unleash/unleash repository to improve the reliability and correctness of feature toggle migrations. Focused on backend development and database migration using JavaScript and SQL, addressing a critical bug in the migration script. The solution ensured that the archived_at timestamp for feature toggles is now accurately derived from event dates, rather than the current time, preserving historical accuracy. Additionally, the migration logic was refined to prevent toggles that were archived and later revived from being incorrectly marked as archived. The migration query was optimized for faster execution and reduced database load, lowering migration risk and improving data integrity.