fix: 新增V9迁移，商品表外键添加级联删除

src/main/resources/db/migration/V9__fix_product_foreign_key.sql

@@ -0,0 +1,12 @@
+-- 修改商品表外键约束，级联删除
+ALTER TABLE stock DROP CONSTRAINT IF EXISTS stock_product_id_fkey;
+ALTER TABLE stock ADD CONSTRAINT stock_product_id_fkey 
+    FOREIGN KEY (product_id) REFERENCES products(product_id) ON DELETE CASCADE;
+
+ALTER TABLE stock_flow DROP CONSTRAINT IF EXISTS stock_flow_product_id_fkey;
+ALTER TABLE stock_flow ADD CONSTRAINT stock_flow_product_id_fkey 
+    FOREIGN KEY (product_id) REFERENCES products(product_id) ON DELETE CASCADE;
+
+ALTER TABLE order_items DROP CONSTRAINT IF EXISTS order_items_product_id_fkey;
+ALTER TABLE order_items ADD CONSTRAINT order_items_product_id_fkey 
+    FOREIGN KEY (product_id) REFERENCES products(product_id) ON DELETE CASCADE;