Redmine

Hi,

Is there any documentation about redmine database (tables, fields and so on) structure?

It can help with partial database migration, for example I wanna move only part of projects in new Redmine database on new server. Also in my database exists some tables generated by some plugins (that already disabled/removed) so I wanna drop them from database. At this moment it is painfull to touch any database tables/fields directly because relation between them is not clear, so intergity of basic Redmine services can be easily broken...

Any advices are appreciated :)