Function headless_lms_models::library::user_exercise_state_updater::data_loader::load_latest_teacher_grading_decision

async fn load_latest_teacher_grading_decision(
    conn: &mut PgConnection,
    latest_teacher_grading_decision: Option<Option<TeacherGradingDecision>>,
    loaded_user_exercise_state: &UserExerciseState
) -> ModelResult<Option<TeacherGradingDecision>>