Arpit Goswami contributed a performance-focused update to the percona/percona-server repository, targeting transaction write-set history efficiency. He replaced the existing std::map with ankerl::unordered_dense::map in the transaction tracking module, leveraging advanced C++ data structures to improve throughput. To support this change, he updated the CMake build system to ensure compatibility with the new dependency. Arpit also backported a bug fix into the 8.0 branch, carefully maintaining code stability and quality throughout the process. His work demonstrated a strong grasp of C++ development, build systems, and performance optimization, resulting in more efficient transaction tracking with minimal risk to replication stability.