[dev] postgres ltree and DataTree/sql.php

[Matt]

> Definitely not user_uid - that's just a record of who created the 
> entry; I'm not
> really sure it's even used anywhere.

Oh! Shows what I know ;) OK, I see, perms stuff is in
category_attributes. Well, that's one worry gone.

> One thing I was considering was having the SQL driver be able to create one
> table per group_uid, in order to optimize a bunch of queries. You could
> probably work with that idea (optionally), too.

That would make a lot of sense - keep all that horde.history stuff away
from more frequently searched data. I'll look at that too, then.

Matt