Oscar Muhr upgraded the database migration tool in the einride/sage repository, focusing on enhancing schema evolution capabilities and reducing maintenance risk. He updated the sggolangmigrate dependency to version 4.19.1, which introduced performance improvements and support for new DDL statements such as TOKENLIST columns and SEARCH INDEX. As part of this work, Oscar also aligned the cloud.google.com/go/spanner dependency with version 1.85 to ensure compatibility and broader migration support. Using Go programming and dependency management skills, he consolidated these changes in a single commit, delivering a targeted feature that improved migration workflows without introducing new bugs during the period.