Yep it worked ok !
which means that I can take my time to work on the beta website without loosing all the messages from my users when I will switch
Had just a little problem with joomfish and uddeim. Unrelated to the tables
When joomfish 2 was installed, uddeim was no longer translated in french (the main language) but stayed in english. I had this same behavior with sobi2 tasks.
When deinstalling joomfish 2 all came back ok
I had no time to investigate on this now but I want to share the info