fix: V8迁移添加硬删除产品和置空category_id

src/main/resources/db/migration/V8__rollback_category_attributes.sql

@@ -6,4 +6,10 @@ DROP TABLE IF EXISTS product_attributes;
 DROP TABLE IF EXISTS category_attributes;
 
 -- 删除商品表的 default_unit 字段
-ALTER TABLE products DROP COLUMN IF EXISTS default_unit;
+ALTER TABLE products DROP COLUMN IF EXISTS default_unit;
+
+-- 硬删除已软删除的产品（deleted = 1）
+DELETE FROM products WHERE deleted = 1;
+
+-- 处理软删除的产品：将关联到要删除的分类的产品的 category_id 置空
+UPDATE products SET category_id = NULL WHERE category_id = 'cat-004';