Function claim_due_for_resolve 

pub async fn claim_due_for_resolve(
    conn: &mut PgConnection,
    scope: &RegistrationScope,
    limit: i64,
) -> ModelResult<Vec<CreditRegistration>>

Claims, for resolve-enrolments, ready_to_submit rows and parked rows due an enrolment check, the later EnrolmentCheckGroup first, minus any whose student already has another live row for the module somewhere between resolving and a known outcome. First pulls slow checks due soon into the batch; see crate::library::credit_registration::enrolment_checks::pull_forward_batched_checks.

Only one completion per student and module goes past resolve at a time, so each is weighed against the outcome of the one before it rather than racing it to the registry; see lock_live_successes_for_same_module. Of two such rows claimed together only the first comes back; the other stays claimable where it is. A parked row sent for a check must be marked with claim_enrolment_checks before the claim’s transaction commits.