Tianyu Zhu developed a stable sorting feature for the XENONnT/fuse repository, focusing on deterministic ordering of pulse groups and photon propagation by pulse ID. Using Python and leveraging strax’s stable_sort and stable_argsort utilities, Tianyu ensured that data processing pipelines produced reproducible results across multiple runs. This work addressed the need for reliable and traceable data ordering, which is essential for accurate downstream scientific analyses. The implementation emphasized algorithmic correctness and data integrity, with all changes tracked through Git for traceability. Over the month, Tianyu concentrated on enhancing reliability in scientific computing workflows rather than addressing bug fixes or maintenance.