[AgileWiki] File layouts are now complete, including the database layout

[Bill la F. <bil...@su...>]

The file layouts are complete. Cheers! But the database layout is not so 
helpful as you might think. Boo!

The database layout will give you a feel for how I handle large data 
values--I expect we will need to handle multi-megabyte files once we 
support a mail client. But its not going to help you understand how the 
database works, because there are a couple layers of abstraction 
involved--structures which implement structures which implement 
structures, in fact. But hey, you've gotta start somewhere!  :-)

So do me a favor, and look it over. Point out any bloopers. And tell me 
where I loose you. 'Cause if you don't understand the first step, then 
none of the rest will make much sense. One thing you may quickly observe 
is that the database file layout and the log file layout deal with 
different layers of abstraction--don't even try to understand how they 
interrelate, because they don't. (And actually, this is one of the 
reasons why things work so well. The log file is dealing with something 
closer to the application layer, and is not simply a log of the changes 
made to the database.)

Bill