forked from wrenn/wrenn
Introduce pre-computed daily usage rollups from sandbox_metrics_snapshots. An hourly background worker aggregates completed days, while today's usage is computed live from snapshots at query time for freshness. Backend: new daily_usage table, rollup worker, UsageService, and GET /v1/capsules/usage endpoint with date range filtering (up to 92 days). Frontend: replace Usage page placeholder with bar charts (Chart.js), summary total cards, and preset/custom date range controls.