diff --git a/09 - Audits/Activity Log.md b/09 - Audits/Activity Log.md
index f388c14..c839db9 100644
--- a/09 - Audits/Activity Log.md	
+++ b/09 - Audits/Activity Log.md	
@@ -1091,4 +1091,17 @@ defaults instead of receiving ''.
 
 ---
 
+### 2026-06-03 — frontend v2.8.79 — request-template maxUsage truly optional
+
+The «حداکثر تعداد استفاده (اختیاری)» field threw a ZodError ("Invalid input") and
+blocked the template form submit. It was wrapped in schemaHelper.nullableInput —
+a helper for REQUIRED fields that adds an issue on null/undefined — so an empty
+optional value failed. Replaced with zod.preprocess (blank/null/NaN → undefined,
+validate int ≥ 1 only when present); default null → undefined. Together with
+backend v2.8.71 (blank → NULL for product_link/delivery_email/enums), optional
+template fields can now be left empty end-to-end.
+**Verification:** tsc + eslint clean.
+
+---
+
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