feat(ADM-018): completed feature

project/migrations/015_shipping.js

@@ -0,0 +1,39 @@
+/** Shipping zones and methods. */
+
+/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
+export const up = (pgm) => {
+  pgm.sql(`
+    CREATE TABLE shipping_zones (
+      id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+      name text NOT NULL,
+      country text NOT NULL,
+      postal_code_prefix text,
+      active boolean NOT NULL DEFAULT true,
+      created_at timestamptz NOT NULL DEFAULT now(),
+      updated_at timestamptz NOT NULL DEFAULT now()
+    )
+  `);
+  pgm.sql('CREATE INDEX shipping_zones_country_idx ON shipping_zones (country, active)');
+
+  pgm.sql(`
+    CREATE TABLE shipping_methods (
+      id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+      zone_id uuid NOT NULL REFERENCES shipping_zones(id) ON DELETE CASCADE,
+      name text NOT NULL,
+      base_cost_cents integer NOT NULL,
+      free_shipping_threshold_cents integer,
+      active boolean NOT NULL DEFAULT true,
+      created_at timestamptz NOT NULL DEFAULT now(),
+      updated_at timestamptz NOT NULL DEFAULT now(),
+      CONSTRAINT shipping_methods_base_cost_non_negative CHECK (base_cost_cents >= 0),
+      CONSTRAINT shipping_methods_threshold_non_negative CHECK (free_shipping_threshold_cents IS NULL OR free_shipping_threshold_cents >= 0)
+    )
+  `);
+  pgm.sql('CREATE INDEX shipping_methods_zone_id_idx ON shipping_methods (zone_id)');
+};
+
+/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
+export const down = (pgm) => {
+  pgm.sql('DROP TABLE IF EXISTS shipping_methods');
+  pgm.sql('DROP TABLE IF EXISTS shipping_zones');
+};