org.cryptocoinpartners.module.xchange.XchangeData taking long time to start up

[douggie]

when there is a lot of data in the DB, the following takes a long time (2-3 mins) to return.

TypedQuery<org.cryptocoinpartners.schema.Trade> query = entityManager.createQuery(
"select t from Trade t where market=?1 and time=(select max(time) from Trade where market=?1)",
org.cryptocoinpartners.schema.Trade.class);
query.setParameter(1, market);