String journal = TicketSerializer.serialize(change);
// atomically store ticket
Transaction t = jedis.multi();
t.set(key(repository, KeyType.ticket, ticketId), object);
t.rpush(key(repository, KeyType.journal, ticketId), journal);
t.exec();
log.debug("updated ticket {} in Redis @ {}", "" + ticketId, getUrl());
return true;
} catch (JedisException e) {