How to achieve version management for database rules ?

See more:

database

versioning

Hi,

We have following scenario.

We have lot of rules configured in database. There is an GUI which displays the rules to the developer and when developer makes any changes it gets stored in database.

1) We want to create a version control for these rules where the history of these rules can be compared.

2) We wanted to achieve the parallel development of these rules. So e.g. if there are 2 databases on which the rules are being changed, there should be one integrated database which should have changes of both the databases.
Now here the issue is that, all the rules has their own IDs in table and those are their primary keys. There are lot of tables in which these rules can be stored and IDs can be referred from one table to another.
So how to merge 2 databases which has primary key/foreign key relations and that can conflict with each other ?

I would really appreciate your help.