pub async fn create_exam(
conn: &mut PgConnection,
name: String,
starts_at: Option<DateTime<Utc>>,
ends_at: Option<DateTime<Utc>>,
time_minutes: i32,
organization_id: Uuid,
course_id: Uuid,
exam_id: Uuid,
teacher: Uuid,
minimum_points_treshold: i32,
grade_manually: bool,
) -> Result<Uuid>