chore: implenet the external invoice

src/modules/invoices/entities/invoice.entity.ts

@@ -52,6 +52,14 @@ export class Invoice extends BaseEntity {
 
   //---------------------------------------------
 
+  @Column({ type: "boolean", default: false })
+  isExternal: boolean;
+
+  @Column({ type: "varchar", length: 250, nullable: true })
+  externalBusinessId: string | null;
+
+  //---------------------------------------------
+
   @OneToMany(() => InvoiceItem, (invoiceItem) => invoiceItem.invoice, { cascade: true })
   items: InvoiceItem[];