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The maintenance_tasks gem from Shopify is a mountable Rails engine for running one-off data migrations from a UI that is separate from the schema migration lifecycle.

In the past, I've used the after_party gem for this use case. That gem runs data migrations tasks typically as part of a post-deploy process with the same up/down distinction as schema migrations.

It seems the big difference with maintenance_tasks is that they are managed from a UI and that there are many more features, such as batch, pausing, rerunning, etc. You can observe the progress of these tasks from the UI as well.

There is a Go Rails Episode about how to use the maintenance_tasks gem.