I suspect doctor_eval and yourself are talking past each other a bit. You seem to be conflating metering and billing in your model: > You raise or lower your p

I suspect doctor_eval and yourself are talking past each other a bit. You seem to be conflating metering and billing in your model: > You raise or lower your prices on the hour boundaries. The new rows inserted after the price change will have the new SKU ID with the new costs. In the big systems Im familiar with metering, pricing, and billing are discrete. Yes, usage will be metered to a SKU. But there are arbitrary pricing plans that denote price/tier/discounts per SKU. So the price is only joined to the SKU usage, per customer, at bill generation time.