chore: add discount logic to apply to the plan price and ...

src/modules/subscriptions/entities/subscription.entity.ts

@@ -20,6 +20,9 @@ export class SubscriptionPlan extends BaseEntity {
   @Column({ type: "decimal", precision: 16, scale: 2, nullable: false, transformer: new DecimalTransformer() })
   price: Decimal;
 
+  @Column({ type: "decimal", precision: 16, scale: 2, nullable: true, transformer: new DecimalTransformer() })
+  originalPrice?: Decimal;
+
   @Column({ type: "boolean", default: true })
   isActive: boolean;