The author of Marginalia Search describes a week of significant coding progress, where they halved the RAM requirements of the search engine, removed the need for downtime during upgrades, and quadrupled the soft limits on keywords. This was achieved by tackling two major technical debt issues: the URL database and reverse index construction. The author reflects on the success of these changes and how they have improved the system's performance and scalability. The changes also had unexpected benefits, such as reducing the system's RAM requirements and allowing for easier backups.