Vadym Zakletskyi enhanced the folio-org/mod-circulation and folio-org/mod-audit repositories by delivering targeted stability and auditing improvements. He addressed a bug where service point names were lost during check-in by refactoring repository logic and introducing robust unit tests in Java to ensure data retention and correct behavior in edge cases. Vadym also expanded the cancellation reason JSON schema to include a source field, enabling origin tracking for consortium workflows. His work involved API design, backend development, and data modeling, resulting in improved data integrity, maintainability, and auditing accuracy across modules, while laying the foundation for future schema evolution and cross-origin auditing.