Kelly Toole enhanced documentation for the Altinity/ClickHouse repository, focusing on clarifying MergeTree’s TTL and drop parts behavior. Using Markdown and leveraging strong documentation skills, Kelly updated and expanded technical guides to accurately reflect the semantics of ttl_only_drop_parts and the effects of TTL expiration on data lifecycle. The work included adding new documentation for the cache_populated_by_fetch setting, correcting reference links, and updating examples to match current code behavior. These improvements addressed onboarding challenges and maintainability by providing clearer explanations and cross-references, enabling developers to better understand TTL-based data management and optimize deployments with more reliable, up-to-date information.