# `PATCH /brand/{id}`

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

Rename brand

Renames/updates a brand by id for the selected company. Fails with
`Brand already exists` if the name is taken by another brand.
When the name changes, linked articles (`brand_id`) get their
`updated_at` bumped; the response reports `touchedArticleCount`.
Emits SSE signal `brand` with payload `{ sender, brandId }`
(`sender` echoes the caller's `x-client-id`).


## Path parameters

| Param | Required | Type | Description |
|-------|----------|------|-------------|
| `id` | yes | integer |  |

## Body (JSON)

| Field | Required | Type | Description |
|-------|----------|------|-------------|
| `name` | no | string |  |
| `gsprpinfo` | no | string |  |

```json
{
  "name": "Acme GmbH"
}
```

## Signals

On success, emits SSE signal: `brand` (see [`GET /events`](../events.md)).

## Response `200`

Updated brand

```json
{
  "brand": {
    "id": 1,
    "name": "…",
    "gsprpinfo": "…",
    "touchedArticleCount": 1
  }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Invalid brand, invalid id, or no company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Brand or company not found — `{"error":"…"}` |
| 409 | Brand already exists — `{"error":"…"}` |

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