What's the best way to handle this?

I'm not sure what APIs/setup to use for this situation:
A company wants to store data projects they do for clients. Each year, the data fields are set (as a result of gov't requirements) and they won't change for any client project for that year. however, the fields required can (and usually do) change every year. So things they require this year, might not be needed the next year and new fields might be introduced.
While there are likely to be many common fields from year to year, there's no way to guarantee which ones will remain consistent. They also want to be able to do searches on the data and fields, for projects within a year and across years.
What's the best framework/API/configuration to handle this? EJB? Simple JDBC? If so, how should the database be handled? Won't it have to constantly create new fields in a table? Or is there another way to handle this?
What's the best way from a "clean architecture" standpoint?

dang, I really have to start over? I finally got all this stuff working again.  well, hopefully it won't be as big a pain this time since the data won't be coming from a different machine.   After completing the Migration Assistant process, I had to reinput a bunch of serial numbers for apps, reinstall print and mouse drivers, etc...  I've finally got the new machine up and running smoothly and now I gotta start over? Sigh.
I was hoping that either I could rename the current account after deleting the other one, or just move everything from one account to the other and then delete the 'RJM' account.
ok, so it sounds like here are the steps I need to take:
- make another full cloned backup of this current machine in Super Duper
- reboot this machine using the advice in the first post, wipe everything clean and reinstall the OS
- create a new account like 'user1' and re-do software update (which is like 2.5 gig worth of stuff) and takes like an hour even on a high speed connection
- then re-do the migration assistant process to the properly named account
- then delete the 'user1' account
does that sound right?

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