Always use struct

src/commit_request.hpp

@@ -60,7 +60,7 @@ struct Operation {
  * memory management and ownership. This class has no knowledge of any
  * specific serialization formats or encoding schemes.
  */
-class CommitRequest {
+struct CommitRequest {
 private:
   ArenaAllocator arena_;
   std::optional<std::string_view> request_id_;