Accidentally truncated pg_type - Mailing list pgsql-general

I have a large database full of irreplaceable data, and due to a
ridiculous happenstance I accidentally executed this code (as a superuser,
of course):

DELETE FROM pg_catalog.pg_type;

Now the database is *seriously* unhappy - every SQL command returns an
error message.  How do I get at my data?

Regards,

Matt