UNWIND $keys AS key
OPTIONAL MATCH (nrc:NrContributor:NrPerformance {id: key})
    -[rel:IS_MAIN_PERFORMER | IS_FEATURING_PERFORMER | IS_SESSION_MUSICIAN]
    ->(c:NrContribution:NrPerformance)
WHERE c.abacusScheduleId IS NULL AND (c.valid is NULL OR c.valid = TRUE)
WITH count(c) as cnt, nrc, key
RETURN key, CASE WHEN nrc IS NULL THEN toFloat(0) ELSE toFloat(cnt) END