Michael Lettrich focused on improving metadata accuracy in the AliceO2Group/AliceO2 repository by addressing a defect in CTF compressed payload size reporting. He corrected the calculation to multiply the number of words by the word size, ensuring that compressed data sizes are reported accurately for downstream processing and auditing. Working primarily in C++ and leveraging his expertise in compression algorithms, data formats, and metadata handling, Michael enhanced the reliability of data governance within the project. His targeted code change demonstrated careful attention to detail and a clear understanding of the system’s requirements, contributing to more robust and trustworthy data management practices.