In previous versions of Liferay, you could add tables and columns on the fly as you were developing your app. In 7.0, this is no longer possible because database schemas are now versioned.
While this makes sense for Production, it is very frustrating for development environments where you can go through dozens of versions before pushing it up to QA/Prod.
Re-implement the auto-upgrade, but disable it by default with a warning to leave it off for Production
Create a breaking change entry for this feature