Oleg Zhuk refactored metadata packaging for the OHDSI/Vocabulary-v5.0 repository, focusing on maintainability and onboarding. He modularized metadata management by introducing a dedicated package under the project’s working directory, reorganizing SQL scripts to streamline workflows and reduce technical debt. Oleg updated documentation in Markdown to clarify the new structure and facilitate contributor onboarding, while removing outdated analytical queries to minimize maintenance risks. His work emphasized code organization and database management, resulting in a cleaner architecture that supports scalable metadata workflows. The changes laid a foundation for faster iteration and easier collaboration, reflecting thoughtful engineering within a short project period.