During this period, work focused on backend development for the Shopify/rails repository, specifically addressing data integrity in UUID handling. Using Ruby and Ruby on Rails, the developer fixed a bug in the PostgreSQL adapter by updating the regular expression used for UUID validation to reject trailing dashes. This change ensured that only valid UUIDs are accepted, aligning the adapter’s behavior with PostgreSQL documentation and Rails expectations. The patch improved the reliability of UUID-based lookups, reducing the risk of silent failures and inconsistent ActiveRecord::NotFound errors. The approach demonstrated careful attention to data correctness and regression prevention in backend systems.