Re-deploying a Rails app without overwriting the production database (Heroku)

Question

I've got a Rails 4 app, hosted on Heroku. I'm running it in production already, and want to be able to make improvements to the app periodically, without touching the production database.

(There's user-generated data in the live app already, and my improvements are to the logic and design, not the database).

Am I correct in thinking that if I re-deploy the app with git push heroku master after each modification then the data in the production db will remain intact?

Thanks.

Answer 1

Yes, redeployment will not alter your database.

Answer 2

Only the app code changes. The database is completely different and thus remains intact.