Migrations like Ruby on Rails

[TheBlckbird]

Rails uses a system where they only have a change function in the migrations and the migrator can automatically roll back actions like creating a column or index. You can also optionally use an up and down method or a special function inside the change function for actions that the migrator can't roll back automatically.
Look at the Rails docs for more information

This should be fairly easy to implement, and I could maybe do it if desired.

[Sophist-UK]

Would it be backwards compatible with the existing implementation?

[TheBlckbird]

yes, as I said you could still use the old system
Have a look at the first section in the Rails docs, it explains a lot