Function make_due_now_batch 

pub async fn make_due_now_batch(
    conn: &mut PgConnection,
    ids: &[Uuid],
    enrolment_check_source: EnrolmentCheckSource,
) -> ModelResult<()>

Makes rows claimable again now, whatever backoff parked them. A row waiting for an enrolment check has its check marked as enrolment_check_source: who asked for it.

Uses the database clock: an app-clock value sampled after BEGIN is still in the future when the same transaction compares it against now().