Worked on migration performance optimization for the IntersectMBO/cardano-db-sync repository, focusing on efficient handling of redeemer fee null assignments during the no-ledger migration process. Addressed the issue of redundant database writes by implementing a targeted SQL change that conditionally set the redeemer_fee field to null only when it was not already null. This approach reduced unnecessary updates to the redeemer table, resulting in improved migration speed and maintained data integrity. Utilized backend development skills with a strong emphasis on database migration and SQL optimization, leveraging Haskell and SQL to deliver a more efficient and traceable migration workflow.