January 2026: Delivered key backend modernization and stability improvements across two repositories. In openmrs/openmrs-core, migrated persistence mappings from Hibernate XML to JPA annotations for CohortMembership, RelationshipType, Cohort, EncounterType, and EncounterProvider, added audit columns (via Liquibase) with tests, removed legacy XML mappings, and standardized primary key generation to GenerationType.IDENTITY. In apache/dubbo, expanded NetUtils test coverage, added safeguards and tests for fixed thread pool queue sizing to prevent OOM scenarios, and implemented SecurityContext cleanup after filter invocation to avoid thread-local leakage. These changes enhance data integrity, runtime stability, and test confidence, delivering clearer maintenance paths and reduced risk for future migrations.