Every recorded change to the team's budgets and alerts in the window, newest first. Needs read access to the team. since and until are required. When cost controls are not enabled for the tenant, budget entries are left out, and a request for budgets alone answers 403. Authors are masked: a Revenium staff member shows as Revenium Support, a change made by the system or recorded when change history began shows as Revenium (system), and an API key shows its name and owner. A deleted item's history stays readable. An unknown, malformed or unreadable teamId answers 404, a malformed subjectId answers 400, and an unknown subjectId matches nothing (an empty page).