[matsemann]

Eh, isn't this making it easier on the application side? Today, when I make a change in my app that needs a migration, I need multiple steps to make sure I don't break old instances of the app still running. With this it looks like one can avoid all that?

[exekias]

That is what this project is trying to achieve. By allowing your client apps to access both the old and the new schema at the same time, you can have the old instances of your application working while the new ones (using the new schema) get deployed.

They can work in parallel for a while until you complete the rollout and call the migration as done.