During June 2025, Tatu Tarvainen developed a feature for the xtdb/xtdb repository that enables accurate serialization and deserialization of LocalTime values using JSON-LD. He introduced a LocalTime to xt:time mapping, updating the AnySerde component to support this new conversion and ensure seamless data interchange between systems. Tatu implemented comprehensive test coverage to verify the mapping’s correctness and prevent regressions, focusing on robust handling of time-related data. Working primarily with Kotlin and leveraging skills in JSON-LD, serialization, and testing, he addressed minor mapping and test issues as part of the feature work, delivering a focused and well-integrated solution.