During October 2025, this developer enhanced the GreptimeTeam/greptime-proto repository by delivering support for Build Index operations through the Region API. They introduced the BuildIndexRequest to the RegionRequest protobuf schema, updating both the RegionRequestHeader and body types to align with evolving API requirements. Using Protocol Buffers and gRPC, their work enabled clients to trigger Build Index operations directly via the API, improving indexing capabilities and streamlining client workflows. Although the contribution focused on a single feature and did not address bug fixes, it demonstrated a clear understanding of API design, schema evolution, and the practical application of protobuf.