# Module: SSE (real-time)

## Purpose

**Server-Sent Events** for annotation activity — `01_annotations.md` §“GET /annotations/events (SSE)” and `AnnotationEvent` shape.

## Code

- `AnnotationEventService` — unbounded `Channel<AnnotationEventDto>`; `PublishAsync` / `Reader` for subscribers.
- `AnnotationsController.Events` — sets `text/event-stream`, subscribes readers, pushes JSON events (implementation detail in source).

## DTOs

- `AnnotationEventDto` — ids, `Status`, `Source`, `Detections`, `CreatedDate`.

## Dependencies

`AnnotationService` (or controller) calls `PublishAsync` after mutations.

## Suite doc

SSE section + `DetectionEvent` vs `AnnotationEvent` distinction (detection progress may be separate pipeline).