invoice item total and subtotal

database/migrations/Migration20260516121012.ts

@@ -0,0 +1,9 @@
+import { Migration } from '@mikro-orm/migrations';
+
+export class Migration20260516121012 extends Migration {
+
+  override async up(): Promise<void> {
+    this.addSql(`alter table "invoice_items" add column "sub_total" int generated always as (COALESCE(unit_price, 0) * quantity) STORED not null, add column "total" int generated always as ((COALESCE(unit_price, 0) * quantity) - COALESCE(discount, 0)) STORED not null;`);
+  }
+
+}