Admin module adapted to new database structure

I have an admin system for a site I own. We have made some changes to the structure of the database, and the admin needs to be updated to work with the new structure. The old site had a table, called merchants. Now I have similar records in five different tables. So those tables need to be mapped to the proper place in the admin. I have added a table that needs to be added to the admin as well. It contains data that was previously in another location. Some record names are changed and the new name is stored in a different table. This table needs to be tied in with the admin. Generally, I just want this adapted to my system. I expect this will take someone who is a good programmer about two hours.