Are the "discounts" applied to items using this plugin actual "discounts" that will be stored in the OrderDiscount column of the Order database table, or does the plugin just modify the price of the item, on-the-fly, based on the preset conditions?

We need to be able to easily query the total amount of discounts given each week/month, so I'm hoping the "difference between the normal price and displayed price" is at least stored in the OrderDiscount column...