In the new German Seblod forum
there is a discussion about how to restore things after update issues.
Basically it comes down to following steps:
1. Export your apps from within Seblod.
2. uninstall Seblod.
3. reinstall Seblod
4. Import your apps again
When uninstalling Seblod, all the tables and fields that were added through Seblod to the Joomla DB will NOT be deleted. So all your data will still be there in the same place.
This seems to be a pretty save way to make things work again when running into issues after updates of either Joomla or Seblod (which, unfortunately, seems to happen quite often).
For pepperstreets scenario, this can be an approach, too. As long as the app export is still working.
To be able to export your app you should always organize your custom content types in an extra app folder. This makes it easier to ex-/import your apps.