Get account usage

Headline metrics for the selected window — each with a per-day spark series and percent change vs the previous equal window.

One entry per calendar day in the selected window (UTC), oldest first.

Voice-call talk-time stats for connected calls (duration > 0) in the window.

Account numbers ranked by total activity (messages + calls) in the window, descending (up to 6).

Fixed-window totals (last 7 days, last 30 days, all time).

All-time totals.

Usage for the current period — a monthly cycle anchored to the account's creation date (jumps of one month from createdAt; stands in until billing and pricing are defined). Independent of the days window. Split per number (plus an all aggregate) by direction and domestic/international.