Andy Copland delivered end-to-end OAuth support for search query sources in the outline/outline repository, focusing on backend and API development with TypeScript and SQL. He updated the SearchQuery enum across both client and server models and introduced a database migration to extend enum_search_queries_source with an 'oauth' value. This cross-layer implementation resolved 400 validation errors that previously affected OAuth-authenticated users performing searches with certain parameters. By refining validation logic and models, Andy improved the reliability and security of OAuth workflows, reducing user friction and potential support issues. His work demonstrated depth in database management and robust integration across application layers.