It turns out, having the exporter connect to the _template1_ database is
not a great idea. PostgreSQL does not allow creating a new database if
the template database is currently being accessed by any clients. Since
_template1_ is the default choice, the `createdb` command will probably
fail.
It doesn't specifically matter which database the exporter connects to,
since it reads most (all?) of its data from the PostgreSQL catalog,
which isn't database-specific.