Worked on the block/ftl repository to enhance lease cleanup workflows by addressing performance bottlenecks in lease deletions. Focused on database optimization, the developer introduced a new SQL index on the lease_id column within the async_calls table, targeting slow foreign-key lookups that previously limited throughput under high churn. This technical approach reduced database contention and minimized latency along the delete path, directly improving system scalability and operational efficiency. The work demonstrated a methodical application of SQL and indexing skills, with clear traceability through detailed commit messages and pull request references, resulting in a measurable improvement to the repository’s performance profile.