During July 2025, Masashi Yoshida focused on improving data reliability for the XENONnT/fuse repository by addressing a critical bug in particle interaction classification. Using Python and leveraging skills in data analysis and physics simulation, he corrected the mislabeling of positrons as beta particles within the lineage_cluster.py and merge_cluster.py modules. This targeted patch ensured that electrons and positrons are now accurately identified, which enhances the precision of lineage and merge cluster analysis. Yoshida’s work reduced downstream errors in analytics and reporting, demonstrating careful debugging, precise code modification, and effective use of Git for traceable change management within a scientific codebase.