We no longer provide custom coding assistance outside of a Business membership. You'll need to be more specific what work we did for you back then as that was a very long time ago. Upgrading Joomla shouldn't have any impact on things specifically within CB as CB has a very low dependency on Joomla itself.

do you provide custom coding assistance with Developer membership?

No, we only provide API assistance for developers. See our membership table below for comparisons.

www.joomlapolis.com/memberships

Nick was the one who worked on 7on7u.com SQL scripts for us,

Nick is no longer a member of the CB team for quite some time now.

I can email you the SQL worksheet that was done and is still in database

I cannot help you with custom coding without a business membership which has a price large enough to cover our time. We're a much smaller team now so our time is significantly limited. We just don't have the time to deal with the constant custom coding requests so we've moved it exclusively to Business membership which is priced based off needs. Expect this to cost into the thousands.

I just do not know how to reconnect with fields

I'm guessing you were using a CB Query Field and were querying that table for information. Check within CB > Field Management if you've any query fields trying to query for that data. Then adjust them accordingly. I'm not sure why updating Joomla alone would break this though.