chore: add manaual refer for ticket of super admin

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

@@ -36,7 +36,7 @@ export class Invoice extends BaseEntity {
   tax: Decimal;
 
   @Column({ type: "decimal", precision: 16, scale: 2, nullable: true, transformer: new DecimalTransformer() })
-  lateFee?: Decimal;
+  lateFee: Decimal | null;
 
   //---------------------------------------------
 
@@ -44,7 +44,7 @@ export class Invoice extends BaseEntity {
   items: InvoiceItem[];
 
   @ManyToOne(() => Discount, (discount) => discount.invoices, { nullable: true, onDelete: "RESTRICT" })
-  discount?: Discount;
+  discount: Discount | null;
 
   get isOverdue(): boolean {
     return this.status === InvoiceStatus.PENDING && new Date() > this.dueDate;