We plan to introduce a tool for assisting migration from SQL databases, but at this very moment, the only way to migrate an existing app is to re-create your DB

We plan to introduce a tool for assisting migration from SQL databases, but at this very moment, the only way to migrate an existing app is to re-create your DB schema in EdgeDB and then write a script to import the data. EdgeDB right now is definitely more geared towards starting new projects with it.