fix: 确认回填PDD规格可用于采购 (#227)

admin/repository/availability_confirmation.go

@@ -0,0 +1,25 @@
+package repository
+
+import "fmt"
+
+// ReplaceBackfilledPDDAvailability 只替换规格 JSON 和更新时间。
+// collect_status、价格、关联及采集时间由新 JSON 和原行乐观锁共同保护，不在此处改写。
+func ReplaceBackfilledPDDAvailability(q Execer, target PDDPriceBackfillTarget,
+	newSKUsJSON, updatedAt string) (bool, error) {
+	result, err := q.Exec(`
+		UPDATE pdd_products
+		   SET skus_json = ?, updated_at = ?
+		 WHERE goods_id = ? AND deleted_at IS NULL
+		   AND COALESCE(skus_json, '') = ?
+		   AND collect_status = ? AND updated_at = ?`,
+		newSKUsJSON, updatedAt, target.GoodsID,
+		target.SKUsJSON, target.CollectStatus, target.UpdatedAt)
+	if err != nil {
+		return false, fmt.Errorf("确认 PDD 商品 %s 的可售状态失败: %w", target.GoodsID, err)
+	}
+	rows, err := result.RowsAffected()
+	if err != nil {
+		return false, fmt.Errorf("读取 PDD 商品 %s 的可售确认结果失败: %w", target.GoodsID, err)
+	}
+	return rows == 1, nil
+}