feat(ADM-018): completed feature

project/migrations/013_cart.js

@@ -0,0 +1,34 @@
+/** Cart persistence: product, variant and quantity only. */
+
+/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
+export const up = (pgm) => {
+  pgm.sql(`
+    CREATE TABLE cart_carts (
+      id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+      user_id uuid NOT NULL UNIQUE,
+      created_at timestamptz NOT NULL DEFAULT now(),
+      updated_at timestamptz NOT NULL DEFAULT now()
+    )
+  `);
+
+  pgm.sql(`
+    CREATE TABLE cart_items (
+      id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+      cart_id uuid NOT NULL REFERENCES cart_carts(id) ON DELETE CASCADE,
+      product_id uuid NOT NULL,
+      variant_id uuid NOT NULL,
+      quantity integer NOT NULL,
+      created_at timestamptz NOT NULL DEFAULT now(),
+      updated_at timestamptz NOT NULL DEFAULT now(),
+      CONSTRAINT cart_items_quantity_positive CHECK (quantity > 0),
+      CONSTRAINT cart_items_unique_variant_per_cart UNIQUE (cart_id, variant_id)
+    )
+  `);
+  pgm.sql('CREATE INDEX cart_items_cart_id_idx ON cart_items (cart_id)');
+};
+
+/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
+export const down = (pgm) => {
+  pgm.sql('DROP TABLE IF EXISTS cart_items');
+  pgm.sql('DROP TABLE IF EXISTS cart_carts');
+};