diff --git a/09 - Audits/Activity Log.md b/09 - Audits/Activity Log.md
index 69f56ac..9f947b9 100644
--- a/09 - Audits/Activity Log.md	
+++ b/09 - Audits/Activity Log.md	
@@ -11,6 +11,15 @@ entries on top. Maintained by agents per the rule in `../AGENTS.md`.
 
 ---
 
+### 2026-06-05 — backend@v2.8.83, frontend@v2.8.100 — Select-offer 403 (id seam) + offer delivery-time `[object Object]`
+
+**Commits:** backend v2.8.83, frontend v2.8.100
+**Touched:** backend `services/marketplace/marketplaceController.ts` (`selectOffer`); frontend `sections/telegram/view/telegram-request-detail-view.tsx`
+**Why:** Testing the new Mini App «انتخاب و پرداخت» surfaced two bugs. (1) **403 on select-offer**: `selectOffer` gated buyer ownership with `toIdString(purchaseRequest.buyerId) !== buyerId` — the session legacy ObjectId vs the PG-uuid buyerId (the recurring seam) → the real buyer got 403. Switched to `!(await sameUser(buyerId, toIdString(purchaseRequest.buyerId)))`. (2) **Delivery time rendered `[object Object]`**: the offer card assumed `offer.deliveryTime` was a number, but it can be an object (`{amount, unit}`). Now extracts `dt.amount ?? dt.value ?? offer.deliveryTimeAmount` when it isn't a plain number.
+**Verification:** backend `npx tsc --noEmit`; frontend `npx tsc --noEmit --ignoreDeprecations 6.0` + eslint — clean. After deploy: buyer taps «انتخاب و پرداخت» → offer accepted (no 403) → in-shell payment opens; delivery time shows a number of days, not `[object Object]`.
+
+---
+
 ### 2026-06-05 — frontend@v2.8.99 — Mini App buyer: see received offers + select & pay in-shell
 
 **Commits:** frontend only (v2.8.99)