You can add the gem to your CI as soon as you install it. In order to postpone existing issues and slowly fix them, you can generate a TODO file automatically.
$ bundle exec database_consistency -gThis command will generate a .database_consistency.todo.yml file that will have disabled existing issues.
Note: You have to manually send this configuration file to the runner if you want it to be used.
$ bundle exec database_consistency -c .database_consistency.todo.yml