[SL] How to renumber all customers, then "start" the numbering?

[Andrew @ A. L. <atm...@km...>]

We have a client using SQL Ledger (we use it as well) however for some
reason as they have been entering customers ever single customer is number 1
(They have a little over 1000 of them entered, and are only on the letter
'M' so far...
 
I am hoping I am going to be able to find a way to renumber all of them,
(was hoping maybe an import / export would have worked) then sort out what
was wrong and get it fixed)
 
They started with version 2.8 I think, and I just upgraded them to 2.8.11
 
Any help would be great, thanks