[Monotone-devel] Overview about tables in database?

[Boris]

Is there any overview what the tables in the database mean and how they  
are related? Some are easy to undertand (like revision_certs or  
revision_ancestry). Others I have no idea what they mean (like rosters,  
roster_deltas or heights). I ask as I try to understand what data could be  
read and displayed in a viewer to create reports which contain more than  
revisions and links between them. I wonder for example what SQL  
statement(s) I would need to see source code differences for two given  
revision IDs? I also wonder what tables have probably no meaning for a  
viewer and could be dropped from the database (imagine a developer wants  
to pass monotone's database to management so they can create reports;  
however the developer doesn't want to send a huge database with all the  
source code inside as management doesn't know anyway what to do with it).

Boris