Worked on stabilizing replica behavior in the valkey-io/valkey-search repository, focusing on resolving a critical crash during RDB loads and subscription lifecycle management. Addressed a concurrency issue in KeyspaceEventManager by updating the main-thread cleanup path to synchronize resource destruction using C++ and absl::Cleanup, ensuring thread safety and preventing access to main-thread-only resources during error scenarios. Developed a deterministic Python regression test to guarantee the crash would not recur, enhancing reliability during partial resync and RDB load operations. This work improved system resilience by reducing outage risk and ensuring robust error handling through comprehensive automated test coverage and concurrency management.