# `GET /events`

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

Subscribe to update signals (SSE)

Opens a Server-Sent Events stream for the authenticated user's
**selected company**. Clients receive named signals when another
request successfully mutates shared data for that company
(including the same browser's other tabs).

Use `EventSource` with credentials so the session cookie is sent:

```js
const es = new EventSource('https://…/api/events', { withCredentials: true });
es.addEventListener('category', () => { refetchCategoryTree(); });
es.addEventListener('articles', () => { refetchArticleIndex(); });
es.addEventListener('article-42000045', () => { refetchArticle('42000045'); });
```

Keep-alive comments (`: keepalive`) are sent roughly every 25s.
Reconnect after changing the selected company (the stream is bound
to the company at connect time).

## Signals

| Signal | Emitted after successful |
|--------|--------------------------|
| `category` | `POST /category`, `PATCH /category/{id}`, `PUT /category/order`, `DELETE /category/{id}`, `POST /category/{id}/image`, `DELETE /category/{id}/image` |
| `articles` | `POST /article`, `PATCH /article/{sku}`, `DELETE /article/{sku}` |
| `article-<sku>` | `PUT /article/{sku}/weight`, `PUT /article/{sku}/prices`, `PUT /article/{sku}/eans`, `PUT /article/{sku}/categories`, `PUT /article/{sku}/brand`, `PUT /article/{sku}/images/order`, `POST /article/{sku}/image`, `DELETE /article/{sku}/image/{fullHash}` |

Signals are only sent when the mutation actually succeeds (2xx).
Failed or no-op validation errors do not emit. The `article-<sku>`
event name uses the concrete SKU (e.g. `article-42000045`).


## Response `200`

SSE stream (`text/event-stream`). Each signal is an SSE event
whose name is the signal id and whose data is `{}`.


## Errors

| Status | Description |
|--------|-------------|
| 400 | No company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |

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