Function headless_lms_models::user_exercise_states::upsert_selected_exercise_slide_id

pub async fn upsert_selected_exercise_slide_id(
    conn: &mut PgConnection,
    user_id: Uuid,
    exercise_id: Uuid,
    course_instance_id: Option<Uuid>,
    exam_id: Option<Uuid>,
    selected_exercise_slide_id: Option<Uuid>
) -> ModelResult<()>