Worked on enhancing reliability and debugging capabilities for the xupefei/delta repository, focusing on backend improvements rather than new user-facing features. Addressed a critical issue in commit error reporting by refactoring the CommitFailedException class in Java to accept an inner exception, thereby preserving the root cause and full stack trace during commit failures. This change improved exception handling and debugging efficiency, reducing the mean time to resolution for commit-related incidents. The work involved careful refactoring and documentation updates to support maintainability and onboarding, leveraging skills in debugging, exception handling, and Java to strengthen the repository’s operational robustness and developer experience.