# `PUT /article/{sku}/brand`

Protected. Requires a valid session cookie (`credentials: 'include'`).

Set or clear article brand by SKU

Sets the article's `brandId` (must belong to the article's company).
Pass `null` to clear the brand. Returns the same shape as GET by SKU.


## Path parameters

| Param | Required | Type | Description |
|-------|----------|------|-------------|
| `sku` | yes | string |  |

## Body (JSON)

```json
{
  "brandId": 3
}
```

## Signals

On success, emits SSE signal: `article-<sku>` (see [`GET /events`](../events.md)).

## Response `200`

Updated article detail

```json
{
  "article": { … }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Validation error — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Article or brand not found — `{"error":"…"}` |

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