I would like to change the definition of a db.Model (and a
search.Searchable), removing some properties that are no longer
needed.

What's the best way to clean up existing entities in the DB?

I tried setting all the unwanted property values to None for every
entity, then uploading the new definition.  But the DataViewer still
shows those old property slots with <null> values, whereas new
entities show the property slots with <missing>.

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