at the moment i have a column "user_id" in the "threads" table cause one thread belongs to an user.

i want to make it like Stackoverflow that one thread can be editable by many users and you can see when they edited, what they edited, roll back changes and so on.

im using symfony, is there a plugin for this?

if no, are there any 3rd part libraries/plugins to download for this to integrate to existing database?

cause i have no idea how to implement this. it sounds like mediawiki, something that already exists?

thanks