Production query plans without production data

PostgreSQL 18 introduces pg_restore_relation_stats() and pg_restore_attribute_stats(), letting developers copy production query planner statistics to dev without transferring production data (stats dumps are under 1MB vs hundreds of GB). This closes a long-standing gap where mismatched statistics caused prod/dev query plan divergence. Simon Willison notes SQLite has offered equivalent functionality for years via the writable sqlite_stat1 table, largely undiscovered.