Developed a TTL-aware state migration capability for the apache/flink repository, focusing on the HeapKeyedStateBackend component. The work involved refactoring migration logic to ensure that state is correctly restored and migrated when time-to-live (TTL) settings are enabled or disabled, addressing scenarios where TTL configurations change during system upgrades. By handling state transitions robustly, the solution reduces upgrade risks and improves reliability for users modifying TTL settings. The implementation was carried out using Java and leveraged backend development and state management expertise, with an emphasis on forward compatibility and traceable changes. No bug fixes were reported, as the focus remained on feature delivery.