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- delete_project now calls cbm_mem_collect() after closing the database to return freed pages to OS immediately - Set purge_delay=0 (was 1000ms) so mimalloc purges freed pages without delay - Set purge_decommits=1 explicitly so macOS uses MADV_FREE_REUSABLE (immediate RSS accounting) instead of MADV_FREE (lazy, RSS stays high) Before: deleting Linux kernel index left 8.1G RSS (2.1G dirty pages) After: dirty pages purged immediately, RSS reflects actual usage