Clean up storage

[janekx21]

The backend storage is very limited. The currently used FREE tier has only 1MB backend model. What if that runs out?

[supermario]

Hey @janekx21 – no sweat, given your app is open source we'll make it work :) right now we'll just receive warnings, and in the unlikely case it gets out of hand, we'll ping you and chat about it.

[janekx21]

With V28 the Backend no longer saves the lesson of each past dictation. It will now save a lesson key (hash of the lesson) and a lesson dictionary that contains all known lessons. This does not change the frontend what so whatsoever. I Love lamdera for those scary migrations. What a fluid process. :>