Chart the selected range on Global stats

[skyfallwastaken]

The Global stats chart always showed the last 30 days, whatever range was selected. It now follows the range picker:

Range	Bars
24 hours	24 hourly bars
7 days	7 daily bars
30 days	30 daily bars
All time	one bar per month, from the first month with usage

The top-8 series are picked from the selected range too, so "24 hours" colors the models that were busy today. The title, subtitle, edge labels and tooltip adapt: "Tokens per hour · Last 24 hours" with 26 Sep 2026, 17:00, and "Tokens per month · All time" with Aug 2026. The tooltip is now anchored to the hovered bar rather than assuming 30 bars.

Screenshots

Demo data: synthetic traffic in the local hcai_demo ClickHouse.

Before: 24 hours selected, still 30 days of bars

After

24 hours	7 days

30 days	All time (the demo data only spans two months)

Testing

• The existing global-usage test in read-model.test.ts now also checks:
  • 24 hourly bars ending at the current hour, with series limited to that window;
  • 30 daily bars;
  • monthly bars from the first month with usage to the current month, adding up to the all-time total.
• bun run typecheck, bun run check: 0 errors. bun test: 303 pass, 0 fail.

🤖 Generated with Claude Code