async fn map_old_exr_ids_to_new_exr_ids_for_courses(
tx: &mut PgConnection,
namespace_id: Uuid,
parent_course_id: Uuid
) -> ModelResult<HashMap<String, String>>
async fn map_old_exr_ids_to_new_exr_ids_for_courses(
tx: &mut PgConnection,
namespace_id: Uuid,
parent_course_id: Uuid
) -> ModelResult<HashMap<String, String>>