Arnaud Roux enhanced the IDESIE/MBIM24_SQL repository by developing SQL-based features that improved data access, facility reporting, and repository maintainability. He implemented advanced SQL queries with JOINs and subqueries to enable detailed data introspection, aggregation, and localized reporting, supporting business analytics and data governance. Arnaud also focused on repository hygiene by removing deprecated scripts and unused placeholder files, reducing technical debt and streamlining code management. His work emphasized database management and query optimization, resulting in more reliable and readable analytics outputs. Over two months, Arnaud delivered targeted improvements that laid a foundation for scalable, maintainable data solutions.