PersistenceManager pm = PMF.get().getPersistenceManager();
c = pm.getObjectById(Contract.class, Contract.generateKeyFromID(id));
c.debug_setResponse(r);
if (c.fetchTrades()) {
print("Fetched Trades for contract " + id);
}
pm.close();
return (c != null) ? c.getFileTrades() : null;