During May 2025, Xiaoguang Wang focused on backend development for the wxiaoguang/gitea repository, addressing a critical issue with divergence metrics. He fixed a bug where the divergence cache was not properly invalidated when the repository’s default branch changed, which previously led to stale data in code health reports. Using Go and Git, Xiaoguang implemented a targeted solution that ensures divergence calculations always reflect the current default branch. He reinforced this fix with integration testing, verifying correct behavior across dashboards and APIs. The approach localized cache invalidation, maintaining performance while improving the reliability and accuracy of divergence metrics for users.