CockroachDB's row-level Time-To-Live (TTL) feature allows MMORPGs to efficiently manage transient data, ensuring that old or unnecessary data does not impact database performance. By implementing row-level TTL, developers can automate the expiration and deletion of data, reducing storage costs and maintaining optimal query performance during high-traffic events. Additionally, CockroachDB's distributed SQL architecture supports REGIONAL BY ROW locality, which optimally stores and accesses game data per region, reducing latency and improving player experience. To implement row-level TTL in CockroachDB, developers can follow a step-by-step approach that includes understanding what data needs TTL, enabling row-level TTL on a per-table basis, monitoring and optimizing TTL performance, handling TTL during high ingestion periods, and utilizing regional locality for multi-region deployments. By leveraging these features, MMORPGs can scale effortlessly, allowing devs to focus on the fun of gameplay rather than database maintenance.