What this tenant's routes actually carried — the month-to-date ledger plus, when the event index can be read, the last 24 hours by the hour.

Same auth as the status view (a logged-in owner/admin of the tenant, or a global admin for the fleet table); no router entitlement is needed, so a workspace that cannot use the router yet gets an honest empty answer rather than a hidden route. Always 200 on an authorised call: available: false with a reason is how "the meter could not be read" is said, because a zero here would read as a measurement.