After I ran rails new narify --database=POSTGRESQL I removed from the directory as many files and folders as possible while still being able to run rails server. Here’s what I found:

.
bin
config   
config.ru
Gemfile
Gemfile.lock

When you run rails server it’ll recreate the log and tmp directories. So what’s been removed? First I removed the local git with rm -rf .git, and here are the files and folders removed:

.
app
db
lib
log
public
test
tmp
vendor
.gitignore
package.json
Rakefile
README.md

Now begins the arduous task of building my own app without generators. I suspect I’ll need the app, db, and lib folders, but perhaps can leave out the others.