@Tony Curry, @Jenny Franklin,
All calculations are completed in the pre-processor. The dbr_daily table is essentially a massive table that exists outside of studio. That is why Dev/Stg/Prod are updated simultaneously once the pre-processor has completed. The way I think about it is that the reporting surface queries this dataset for reports. For totals, it is using each individual line for summing. Each line can be one cent or ten dollars. When you pivot it in Daily Transparency (report) it sums on the fly.
Cheers,
Ryan