Hello Haichem,
the focus of the database is german pork butchers in Britain.
So usually it starts with those butchers who were born in Germany and emigrated to Britain, and then includes their children (if they were also pork butchers) and their employees.
Some also went on to America, so these are also included.
There is a field for parent's names, so the german parents of the emigrants can be entered here, but in general, the database doesn't deal with german ancestry as such. It's main use is to help track who came over, where they settled, and the interrelationships (if any) between them.
I do have quite a few names, but some are on the German PB database already, although I could add more detail or make corrections.
There is an on-going discussion about this (who is allowed to enter data, etc see
Topic: DBSIG: German Pork Butchers
http://www.rootschat.com/forum/index.php/topic,613454 )
At the moment you will need to contact the contributor, and ask them to add your data
(hence the restriction on being able to use the PM system

)
regards,
Bob