feat(F-120): completed feature

project/migrations/041_category_delete_cascade.js

@@ -0,0 +1,48 @@
+/**
+ * F-120: Allow deleting a category by cascading to its children and the
+ * product-category links that point at it.
+ *
+ * - catalog_product_categories.category_id: ON DELETE CASCADE — when a product
+ *   loses all its categories it is fine; the product itself stays active.
+ * - categories_categories.parent_id: ON DELETE CASCADE — child categories are
+ *   removed along with their parent so admins can prune a branch in one go.
+ *
+ * @param {import('node-pg-migrate').MigrationBuilder} pgm
+ */
+export const up = (pgm) => {
+  pgm.sql(
+    'ALTER TABLE catalog_product_categories DROP CONSTRAINT IF EXISTS catalog_product_categories_category_id_fkey',
+  );
+  pgm.sql(
+    `ALTER TABLE catalog_product_categories
+       ADD CONSTRAINT catalog_product_categories_category_id_fkey
+       FOREIGN KEY (category_id) REFERENCES categories_categories(id) ON DELETE CASCADE`,
+  );
+  pgm.sql(
+    'ALTER TABLE categories_categories DROP CONSTRAINT IF EXISTS categories_categories_parent_id_fkey',
+  );
+  pgm.sql(
+    `ALTER TABLE categories_categories
+       ADD CONSTRAINT categories_categories_parent_id_fkey
+       FOREIGN KEY (parent_id) REFERENCES categories_categories(id) ON DELETE CASCADE`,
+  );
+};
+
+export const down = (pgm) => {
+  pgm.sql(
+    'ALTER TABLE catalog_product_categories DROP CONSTRAINT IF EXISTS catalog_product_categories_category_id_fkey',
+  );
+  pgm.sql(
+    `ALTER TABLE catalog_product_categories
+       ADD CONSTRAINT catalog_product_categories_category_id_fkey
+       FOREIGN KEY (category_id) REFERENCES categories_categories(id) ON DELETE RESTRICT`,
+  );
+  pgm.sql(
+    'ALTER TABLE categories_categories DROP CONSTRAINT IF EXISTS categories_categories_parent_id_fkey',
+  );
+  pgm.sql(
+    `ALTER TABLE categories_categories
+       ADD CONSTRAINT categories_categories_parent_id_fkey
+       FOREIGN KEY (parent_id) REFERENCES categories_categories(id) ON DELETE RESTRICT`,
+  );
+};