chore: replace manual SQL migrations with node-pg-migrate

backend/tests/integration/setup/testDb.ts

@@ -1,5 +1,5 @@
 import { Pool } from 'pg';
-import fs from 'fs';
+import { runner } from 'node-pg-migrate';
 import path from 'path';
 
 export const testPool = new Pool({
@@ -11,17 +11,29 @@ export const testPool = new Pool({
 });
 
 export async function migrate(): Promise<void> {
-  const sql = fs.readFileSync(path.join(__dirname, '..', '..', '..', 'init.sql'), 'utf-8');
-  await testPool.query(sql);
+  await runner({
+    databaseUrl: {
+      host: process.env.TEST_PGHOST || 'localhost',
+      port: parseInt(process.env.TEST_PGPORT || '55432', 10),
+      user: process.env.TEST_PGUSER || 'redefined_test',
+      password: process.env.TEST_PGPASSWORD || 'redefined_test',
+      database: process.env.TEST_PGDATABASE || 'redefined_test'
+    },
+    dir: path.resolve(__dirname, '..', '..', '..', 'migrations'),
+    direction: 'up',
+    migrationsTable: 'pgmigrations',
+    count: Infinity
+  });
 }
 
 export async function resetDb(): Promise<void> {
   await testPool.query(`
-    TRUNCATE TABLE orders, customer_tokens, customer_sessions, customers, item_images, items
+    TRUNCATE TABLE orders, checkout_items, checkouts, shipping_addresses, cart_items, carts,
+      customer_tokens, customer_sessions, customers, item_images, items
     RESTART IDENTITY CASCADE
   `);
 }
 
 export async function closeDb(): Promise<void> {
   await testPool.end();
-}
+}