netdisco/lib/App/Netdisco/DB/schema_versions/App-Netdisco-DB-20-21-PostgreSQL.sql

BEGIN;

CREATE UNIQUE INDEX jobs_queued ON admin (
  action,
  coalesce(subaction, '_x_'),
  coalesce(device, '255.255.255.255'),
  coalesce(port, '_x_')
) WHERE status LIKE 'queued%';

COMMIT;