async fn get_weekday_hour_submission_counts(
    pool: Data<PgPool>,
    course_id: Path<Uuid>,
    user: AuthUser
) -> ControllerResult<Json<Vec<ExerciseSlideSubmissionCountByWeekAndHour>>>
Expand description

GET /api/v0/main-frontend/courses/:id/weekday-hour-submission-counts - Returns submission counts grouped by weekday and hour.