Gavan Fantom [Mon, Jan 12, 2004 at 12:57:22PM +0000]:
> Could the deinstall script not dump the data into some "standard"
> location, to be used by a subsequent install script if necessary?

I think someone could have a look how Debian does it. Debian can
automatically upgrade existing PgSQL databases (via dump/restore procedure,
nothing magic there) -- but it had such functionality from some time, so I
guess that Debian PostgreSQL upgrading scripts can be quite mature now.