Cost
CUR 2.0 normalised into Parquet, rolled up daily by account and service for dashboards, and queryable at resource grain for the questions a dashboard cannot answer.
Daily × account × service rollups live in Postgres and serve every dashboard instantly. Resource-level detail and unit economics run over Parquet in Athena. The rule is simple: if it is on a dashboard it is a rollup, if it is a question it is Athena.
The Cost and Usage Report restates. A month is open until it is finalized, and current-month figures move. We track that state and label it rather than presenting a number that quietly changes under you. Re-ingestion replaces the affected partition — idempotent replace, never append, so a restatement corrects the history instead of doubling it.
Cost allocation tag activation is not retroactive, and neither is a CUR export. Both are set up at onboarding, deliberately — it is the difference between a trend product that has trend on day one and one that asks you to wait a year for it.