Contributed to the valkey-io/valkey repository by delivering a performance-focused feature that enables asynchronous release of expired keys on writable replicas during FLUSHALL ASYNC operations. This work involved moving the cleanup of replicaKeysWithExpire to the lazyfree background thread, which reduced main-thread blocking and improved throughput under high write and load conditions. The implementation aligned with the asynchronous design principles of FLUSHALL ASYNC, enhancing system reliability during primary-replica switches. The developer utilized C and applied skills in asynchronous programming, database management, and system programming, while thoroughly documenting the problem, root cause, and user scenarios to support maintainers and reviewers.