Worked on the apache/incubator-devlake repository to enhance database connection pool configuration, focusing on resource optimization and scalability. Addressed a bug by enabling explicit support for zero idle database connections, allowing deployments to reduce unnecessary resource consumption under variable load. The solution preserved backward compatibility by maintaining a default of ten idle connections when no value is specified, ensuring seamless integration with existing setups. Implemented the fix using Go, leveraging backend development and database management expertise. This targeted change provided more granular control over database connections, aligning with performance and reliability goals for diverse deployment environments without introducing new features.