diff --git a/docs/persistence.md b/docs/persistence.md
index d9cecfde..94fb1cdf 100644
--- a/docs/persistence.md
+++ b/docs/persistence.md
@@ -101,8 +101,8 @@ Bin-loop helpers `build_row` + `record` land each row at
 `turn_end`; writes are best-effort, a sqlite hiccup logs + lets
 the turn loop continue.
 
-No host-side vacuum yet — tracked separately. Target retention
-~90 days, age-only sweep like events_vacuum.
+`hive-c0re::stats_vacuum` runs hourly and deletes rows older than 90 days
+(`started_at < cutoff`). Age-only sweep, same pattern as `events_vacuum`.
 
 ### `/state/hyperhive-harness.json` (per agent)