During May 2025, Xiaoguang worked on the wxiaoguang/gitea repository, focusing on backend development to improve the accuracy of divergence metrics. He addressed a bug where divergence cache was not properly invalidated when the repository’s default branch changed, which could lead to stale data in code health reports. Using Go and Git, Xiaoguang implemented a targeted fix that ensures divergence calculations always reflect the current default branch. He reinforced this solution with integration testing, verifying correct behavior across dashboards and APIs. The cache invalidation was designed to be low-overhead, maintaining performance while enhancing the reliability of divergence metrics for users.