Worked on the ClickHouse/ch-go repository to enhance the chpool package by implementing a graceful shutdown mechanism for pool-backed clients. Developed a new Close method for the Client, ensuring that the underlying connection is properly closed and the resource pool is safely destroyed, which helps prevent resource leaks and improves overall reliability. Accompanied this feature with a dedicated unit test to verify correct resource cleanup and shutdown behavior. Utilized Go for backend development, focusing on API design and connection pooling best practices. The work demonstrated attention to code quality and maintainability, addressing stability concerns for users relying on connection pools.