Has anybody on the system been posted yet?
If that works it will be a miracle.
On an older and maturer system (it crashed in January too) all my 'new' details were correctly mapped across. Where there were no 'new' details all the odl ones were left in place - line manager 3 years out of date - wrong unit - wrong phone numbers - wrong accounts codes.
Don't worry about the little teething problems with JPA. You ain't seen nothing yet. Best bit of course is that all the people capable of sorting in out are being posted.