> Within the context of a web2py request, wouldn't there be two transactions 
> open (one for each database)? In that case, at least if the request results 
> in an error, both transactions would be rolled back.
>
> Anthony 
>

well, pydal isn't used only in web2py's context but even if it was, you'd 
be forced to call a commit() on the callback (or just before that) to 
ensure referential integrity when dealing with such scenario. This 
theoretically would enable handling the logic required to perform such a 
task feasible, but only in the case if it's the only operation in the whole 
function. A user can still put a commit() here and there in web2py, 
breaking the aforementioned "safety"... moreover, I don't certainly want a 
"something" commit()ting on my behalf under the hood, breaking my own app's 
integrity.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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