Export settled usage for every visible product and resource over a UTC date range.

Selects settlement timestamps in [since, until), with exact decimal strings for money and quantities. Pending holds are excluded. Each page contains data, nextCursor and server-rendered CSV; concatenate CSV pages in order, with the header on the first page only. Follow nextCursor with the same range. Pages use deterministic timestamp/id ordering and preserve microseconds; they are live reads, not a retained database snapshot. Every page rechecks the key's usage permission and tenant visibility. finalThrough is a moment before which no row can still appear or change; a row's final is true once its resource is deleted and every charge it will have is settled before finalThrough.