# 024 — Time range controls (Grafana-style presets)

## Summary

Today the only way to set the active time range is dragging over `LogTimeline`
(`App.tsx`'s `range` state, passed to `LogPreview`/`Metrics`/`Dashboards` as
`startMs`/`endMs`). The wishlist wants explicit controls like Grafana's: an "All"
option and relative presets ("last 5 minutes", etc.), not just drag-to-select.

## Scope

- A time-range control component (dropdown or button row) offering at least:
  "All" (no range — today's `range === null` default) and a handful of relative
  presets (e.g. last 5m / 15m / 1h / 24h), placed near `LogTimeline` alongside the
  existing drag-select interaction.
- Selecting a preset computes `{startMs, endMs}` relative to now and feeds the
  same `range` state `App.tsx` already threads through to `LogTimeline`,
  `LogPreview`, `Metrics`, and `Dashboards` — no new plumbing needed downstream,
  since all four already accept/consume a range.
- Relative presets need to "move with time" while active (e.g. "last 5 minutes"
  should mean *rolling* last 5 minutes, not a frozen window from selection time) —
  decide and implement a refresh cadence (e.g. re-resolve the relative range on
  the same interval the app already polls for new data) versus a one-shot
  resolved range; document the choice.
- Manually dragging on `LogTimeline` after a preset is active should override it
  back to a fixed (non-rolling) range, same as today.

## Acceptance criteria

- Selecting "All" clears the range the same way today's implicit default does.
- Selecting a relative preset narrows `LogPreview`, `LogTimeline`, `Metrics`, and
  `Dashboards` to that window.
- A rolling preset's window visibly advances over time without user interaction,
  if that's the chosen behavior (see Scope).
- Dragging on `LogTimeline` while a preset is active switches back to a fixed
  range bounded by the drag.

## Depends on

None — the underlying range plumbing (`App.tsx` → `LogTimeline`/`LogPreview`/
`Metrics`/`Dashboards`) already exists; this only adds the control surface.