Run a Rails script in the Heroku console

How can I run a script in the Heroku console to make direct changes to the database?

1. backup the database

heroku pg:backups:capture --app application-name

2. run bash in the Heroku console

heroku run bash --app application-name

3. run ruby script

bundle exec rails runner script/delete_duplicate_contacts.rb

quit

~$ exit

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If that fails or a transaction rollback occurs, you can drop scripts directly into the console:

bundle exec rails c

irb(main):001:0> paste script here
irb(main):002:1* each line break will be on a new console line