added accounting failing handles

database/sql/products_karat_patch.sql

@@ -0,0 +1,22 @@
+-- عیار محصول (اختیاری) — idempotent
+-- اجرا روی DB tenant در صورت نیاز دستی
+
+SET @db := DATABASE();
+
+SET @has_karat := (
+  SELECT COUNT(*)
+  FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = @db
+    AND TABLE_NAME = 'products'
+    AND COLUMN_NAME = 'karat'
+);
+
+SET @sql := IF(
+  @has_karat = 0,
+  'ALTER TABLE `products` ADD COLUMN `karat` VARCHAR(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL',
+  'SELECT 1'
+);
+
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;