postgresql-* package namespace (was: Bug#683486: ITP: barman -- Backup and Recovery Manager for PostgreSQL)
I usually prefer packages to use the upstream name so they are easy to find (think other distributions).
The various postgresql-* packages are mostly plugins (PL/something) which follow the example of postgresql-plperl-x.y (built from PG core). For real applications like barman, that's not really necessary.
Also, by all means, do not rename existing packages.