Forumlar / Craftwork / Server-side / merge the data base...

Hello, im runing a site with 0.6.20 for some time, there is alos other site with same content, users would like to see merge both sites... Both are genoa

now my question... what u guys thinking about merging data bases... i already did something like this but there is much users / topics
i manage to learn struture of the cot d.b. and can do it "manualy"... would be there a way to do it with some software? any tips, guideing?!

My site have:
~ 500 users
~ 322 topics
~ 9212 posts...

other one:
~ 6000 users
~ 300 topics
~ 3000 posts
-Dave