Mapping between sqlippool and radius attributes

[Thore Krüss]

Good evening,
after reading the configuration files, the wiki entry as well as trying to dig
in the code I haven't been able to figure out how the columns from the sqlippool
module are mapped back to radius attributes.

The default table scheme creates a column "framedipaddress" which appears to
become the "Framed-IP-Address" attribute through magic.
Is there a way to extend this with a "Framed-IPv6-Prefix"? 
Is adding a column with that name sufficient?

I've seen it being done using xlat extensions and sql in the post-auth section
but this seems to be a horrible approach and I'd love to avoid that.

Best regards
Thore