# Load Rhythm (Notchset): prompt.md (v1.0.0)

- id: `load-rhythm` · version 1.0.0 · block · pro (Pro)
- category: Data
- build: Base UI (one set of files; its dependencies follow the build)
- install (this build): `npx shadcn@latest add @beautiful-ui-pro/load-rhythm`
- npm dependencies: class-variance-authority@^0.7
- registry dependencies: utils, @beautiful-ui/segmented-control, https://beautiful-ui.dev/r/notchset-foundation.json
- docs: https://beautiful-ui.dev/components/load-rhythm
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

A week of load as a 7×24 dot grid (dot size is volume, hot hours in signal) that glides into stacked hour columns, with RUNS / DEPLOYS / ERRORS, a draggable 2H / 4H / 6H maintenance window that shades the hours it covers, its share of load, the quietest window and SCHEDULE MAINTENANCE.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: `class-variance-authority@^0.7`.
- Files: `components/ui/notchset/blocks/load-rhythm.tsx`; shared code: `lib/beautiful-ui/notchset/instrument.tsx`, `lib/beautiful-ui/notchset/root.ts`, `lib/beautiful-ui/notchset/button-variants.ts`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `segmented-control`, `notchset-foundation`.
- Builds: one set of files for both, but its dependencies come in Base UI and Radix builds. Install the one that matches the project (see Install): a free item's bare URL installs the Base UI build of it and its dependencies.
- Exports to keep: `LoadRhythm`, and every exported type.
- CSS: the install adds the notchset foundation (tokens, keyframes, motion levels) to your global stylesheet once. Nothing to import by hand.
- Re-running `add` (or `--overwrite`) re-applies those rules: put overrides in your own CSS, never in the installed rules.
- Tokens: retheme with the `--notchset-*` custom properties (`--notchset-check`, `--notchset-control-edge`, `--notchset-draw-from`, `--notchset-ease-bloom`, `--notchset-ease-glide`, `--notchset-ease-key-down`, `--notchset-ease-key-up`, `--notchset-ease-travel`, `--notchset-fade`, `--notchset-focus-color`, `--notchset-focus-inset`, `--notchset-grow-to`, `--notchset-key-down`, `--notchset-key-up`, `--notchset-life-from`, `--notchset-life-ms`, `--notchset-node-blink`, `--notchset-node-bloom`, `--notchset-node-delay`, `--notchset-plate-color`, `--notchset-rise-from`, `--notchset-rule`, `--notchset-scan-to`, `--notchset-scroll`, `--notchset-signal`, `--notchset-sweep-to`, `--notchset-travel`). Never add Tailwind colour classes inside the component.

```tsx
import { LoadRhythm, type MaintenanceWindow, type RhythmMetric } from "@/components/ui/notchset/blocks/load-rhythm";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `LoadRhythm` | `load-rhythm` | Controls, the dot grid with its window slider, and the aside. |

Style a part with `[data-slot="<slot>"]` selectors or its `className`; keep the attributes when editing.

## Sound
- Keep every `data-slot` and `data-sound` attribute: the sound layer reads them.
- Installing this item adds no audio. Nothing plays until the app mounts `SoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/notchset-sound.json`, import from `@/components/ui/notchset/sound-provider`); `useSound()` gives `muted` and `setMuted` for a mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/notchset/blocks/load-rhythm.tsx` as the reference implementation before changing or recreating anything, and match it: sizes, colours per theme, motion timings, copy and behaviour.
- If you deviate (a prop you can't honour, a style you changed, a dependency you swapped), say so in your reply, part by part.
- Keep the accessibility contract, the keyboard map and the motion levels listed below.

## Use it when
- traffic heatmap, punch card, hour of day, day of week, maintenance window, load pattern, ops, Notchset
- Seeing when a service is busiest across a week
- Choosing a maintenance or deploy window

### Not when
- A single day's timeline: use a line chart
- Months of history: use an activity heatmap

## Mistakes
- Pass hours in one zone and label it
- Keep the values hourly; the grid is always 7×24

## Usage

```tsx
import { LoadRhythm, type MaintenanceWindow, type RhythmMetric } from "@/components/ui/notchset/blocks/load-rhythm";

export function Rhythm({ metrics }: { metrics: RhythmMetric[] }) {
  return (
    <LoadRhythm
      title="Load rhythm"
      metrics={metrics}
      onSchedule={async (w: MaintenanceWindow) => {
        await fetch("/api/maintenance", { method: "POST", body: JSON.stringify(w) });
      }}
    />
  );
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `metrics` | `{ id, label, values, previous, hot?, riseIsBad? }[]` |  | values: seven days (Monday first) of 24 hourly numbers; hot marks values above it in signal. |
| `lengths / zone` | `number[] / string` |  | Window lengths in hours (2, 4, 6) and the zone label (UTC). |
| `onSchedule` | `({ day, start, hours }) => Promise<void>` |  | Book the window (day is null for every day). |

Full docs: https://beautiful-ui.dev/components/load-rhythm

## Customising
- Colours: the component reads your shadcn tokens (`--background`, `--foreground`, `--border` …), refined by the `--notchset-*` tokens. The signal colour is `--notchset-signal` (it falls back to `--destructive`). Set tokens on `:root`, or on any container to retheme one area.
- Dark mode follows the `.dark` class on an ancestor (the shadcn and next-themes convention).
- Update later by re-running the install with `--overwrite` (review the diff if you edited it). Changelog: https://beautiful-ui.dev/r/changelog.json

## Keyboard

| Keys | Action |
|---|---|
| ← → / Page Up / Page Down | Move the window |
| Home / End | Window to the start or end of the day |

## Performance

- 168 SVG circles moved by CSS transitions; nothing runs while idle.

## Responsive

- Under 760px (container width) the aside stacks under the chart, which keeps 620px and scrolls sideways.

## Motion inventory

| Interaction | What moves |
|---|---|
| WEEK ↔ STACKED | Every dot glides to its new place (700ms, staggered by hour and day) |
| Window | Glides on click and key presses; follows the pointer while dragged |
| Numbers | Totals and the window's share roll |

## Accessibility contract (preserve when editing)
- The chart is an image labelled with the window and its share of load
- The window is a slider (arrows ±1 hour, Page Up / Down ±3, Home / End) with time value text
- Day labels are toggle buttons that focus one day

## Install

```bash
npx shadcn@latest add @beautiful-ui-pro/load-rhythm
```

Pro item: needs the `@beautiful-ui-pro` registry in `components.json` and `BEAUTIFUL_UI_TOKEN` in `.env.local` (https://beautiful-ui.dev/account). Setup: https://beautiful-ui.dev/docs/pro. Your components.json `style` picks the build: radix-*, new-york and default get Radix, base-* gets Base UI.

## Credits
- Built on shadcn/ui (https://ui.shadcn.com)

The notchset foundation (the tokens listed above, keyframes and motion levels) installs once with the first component; its CSS is public at https://beautiful-ui.dev/r/notchset-foundation.json.