USE billing;

INSERT INTO contacts(email) VALUES('default-system@default.invalid');
SELECT LAST_INSERT_ID() INTO @cid;

UPDATE contracts ctr, billing_mappings m, products p, contacts c SET ctr.contact_id = @cid
WHERE c.id = ctr.contact_id
    AND m.contract_id = ctr.id
    AND m.product_id = p.id
    AND p.class IN ('pstnpeering', 'sippeering', 'reseller')
    AND c.reseller_id IS NOT NULL;