invoice number

database/migrations/Migration20260422123253.ts

@@ -0,0 +1,24 @@
+import { Migration } from '@mikro-orm/migrations';
+
+export class Migration20260422123253 extends Migration {
+
+  override async up(): Promise<void> {
+    // Create sequence for invoice_number
+    this.addSql(`CREATE SEQUENCE IF NOT EXISTS invoice_number_seq START 1;`);
+    
+    // Set the sequence to start from the max existing invoice_number + 1
+    this.addSql(`SELECT setval('invoice_number_seq', COALESCE((SELECT MAX(invoice_number) FROM invoices), 0) + 1, false);`);
+    
+    // Set default value for invoice_number to use the sequence
+    this.addSql(`ALTER TABLE invoices ALTER COLUMN invoice_number SET DEFAULT nextval('invoice_number_seq');`);
+  }
+
+  override async down(): Promise<void> {
+    // Remove default from invoice_number
+    this.addSql(`ALTER TABLE invoices ALTER COLUMN invoice_number DROP DEFAULT;`);
+    
+    // Drop the sequence
+    this.addSql(`DROP SEQUENCE IF EXISTS invoice_number_seq;`);
+  }
+
+}