Get rid of database.json
database.json was necessary when we used db-migrate (and even so, not that necessary back then but hey.)
The idea would be to put database configuration in config.yml. Sounds simple, but we must provide an upgrade path for existing installs, especially if we rework the config data structure for databases.
Note : a postgrator.sample.json is still advised in the git repo for devs who run hosted postgresql versions.