+ GREATEST(u.created, u.updated, COALESCE(c.created, '1970-01-01'), COALESCE(c.updated, '1970-01-01'), COALESCE(o.created, '1970-01-01'), COALESCE(o.updated, '1970-01-01'), COALESCE(g.created, '1970-01-01'), COALESCE(g.updated, '1970-01-01')) AS modified,