Worked on the LibreChat repository to deliver a targeted improvement for CosmosDB indexing, focusing on enhancing performance and bookmark reliability within conversation tagging workflows. The approach involved adding an index to the position field in the ConversationTagSchema using JavaScript, MongoDB, and Mongoose, resulting in reduced query latency and increased stability for bookmarks, especially under high concurrency. This single, well-scoped schema update addressed a specific bookmark-related error and ensured traceable, maintainable changes. The work directly supported business needs by enabling faster, more reliable search and bookmarking, reflecting a precise and thoughtful application of backend development skills to production challenges.