PostgreSQL Autovacuum Tuning for High-Churn SaaS Tables

Deep dive into autovacuum's cost-based throttling internals (vacuum_cost_delay, vacuum_cost_limit, cost_page_hit/miss/dirty), how to identify tables where the global settings cause lag, and the ALTER TABLE storage parameter overrides that let high-churn tables vacuum aggressively without starving I/O for the rest of the cluster