Assuming you used the same database locally as you plan to use in production you can take a dump of that and import it on the production database (For things like PostgreSQL / MySQL / MariaDB, maybe SQLite though I’ve never tested that).
Heroku though becomes a problem because you don’t have direct access to the database, you could code an import using the ./config/functions/bootstrap along with some kind of other dump such as .csv files.
See:
