diff --git a/09 - Audits/Activity Log.md b/09 - Audits/Activity Log.md
index 07e3a72..a543ac6 100644
--- a/09 - Audits/Activity Log.md	
+++ b/09 - Audits/Activity Log.md	
@@ -462,4 +462,13 @@ run end-to-end (require live `ADMIN_TOKEN`).
 
 ---
 
+### 2026-06-02 — backend@515bea3 — guard dataCleanupService against MONGO_CONNECT_MODE=never
+**Commits:** `515bea3`
+**Touched:** `src/services/admin/dataCleanupService.ts`
+**Why:** dataCleanupService dynamically imported 10 Mongoose models unconditionally; under MONGO_CONNECT_MODE=never this throws at runtime. Routed user counts through AuthUser facade (Postgres-gated). Wrapped all other model access in isMongoAvailable() guard — cleanup ops return a safe error result when MongoDB is disconnected.
+**Verification:** 5 test suites 11 tests pass. typecheck clean. Mongo scan: all remaining hits confirmed inside Postgres-gated fallback branches.
+**Linked docs updated:** none.
+
+---
+
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