Guang worked on internal maintenance for the ClickHouse/ClickHouse repository, focusing on reorganizing the settings history in preparation for the 25.10 release. He moved the definition of the optimize_rewrite_like_perfect_affix setting to ensure its correct placement within the versioned configuration, without introducing any functional changes or altering default values. This work, implemented in C++ and emphasizing code organization and refactoring, improved the traceability and auditability of configuration changes. By laying a cleaner foundation for future versioned updates, Guang’s contribution reduced release risk and facilitated ongoing maintenance, demonstrating a methodical approach to internal codebase structure and release readiness.