feat(sse): very rough events. Not used in the client yet

feat(sse): very rough events. Not used in the client yet

backend/models/image.go

@@ -130,6 +130,17 @@ func (m ImageModel) FinishProcessing(ctx context.Context, imageId uuid.UUID) (mo
 	return userImage, err
 }
 
+func (m ImageModel) StartProcessing(ctx context.Context, processingImageId uuid.UUID) error {
+	startProcessingStmt := UserImagesToProcess.
+		UPDATE(UserImagesToProcess.Status).
+		SET(model.Progress_InProgress).
+		WHERE(UserImagesToProcess.ID.EQ(UUID(processingImageId)))
+
+	_, err := startProcessingStmt.ExecContext(ctx, m.dbPool)
+
+	return err
+}
+
 func (m ImageModel) Get(ctx context.Context, imageId uuid.UUID) (ImageData, error) {
 	getImageStmt := SELECT(UserImages.AllColumns, Image.AllColumns).
 		FROM(