python - how to cleanly remove ndb properties

Question

in my app i need to remove a few of my models properties.
i checked out this link but the first issue is that the properties are on a polymodel and there is no way im going to switch to an expando for the time to remove the properties, im not even shure what could happen if i change a polymodel to an expando.

so how do i remove properties from existing entities?

i was thinking to set all StringProperty to None and then remove these from the model schema and redeploy. one of those properties is a BooleanProperty, i can't set this one to None right?! or an ndb.PickleProperty... how should i remove that?

does anybody know how to get this done properly?

Answer 1

Waitting for answers