Remove database in a Rails project and all and all associated files

I am currently building an application in Rails that consumes an API, recently I had to to generate a model and save some records to "solve" some problems, but I don't have that problem now and so I would like to ask.

1. In my case (using an API), it is good practice not to use a database at all?
2. If the answer above is yes, what files can I delete my project to leave my Rails project as clean as possible? (out of things you will use)