Disable autovacuum for one (pretty much read-only) database in a cluster

I’ve got a PostgreSQL cluster on my development system in which I’ve created several databases. I also have a dump of the last state of the DB of an old system imported in which I (very) occasionally need to look something up, so this database is pretty much read-only, while the others are live (if low traffic except for the Akonadi one).

I am finding lots of instructions for disabling autovacuum either globally (i.e. for the entire DB cluster) or for individual tables, but how can I permanently disable it for just one database in the cluster?