Worked on the typeorm/typeorm repository to enhance closure junction tables by enabling them to inherit and propagate schema and database properties from their parent entities. This involved designing and implementing changes in TypeScript to the ORM layer, focusing on database design principles to ensure that closure tables maintained consistency with parent entity structures. Developed comprehensive tests to verify correct inheritance and prevent schema drift, directly addressing a propagation bug identified as issue #12110. The work emphasized robust test coverage and careful schema verification, resulting in improved reliability and maintainability for closure table handling within the TypeORM codebase.