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I have updated a model of which some instance have already been stored in the datastore. I deleted some of its properties.
Is is possible to fully delete those properties from the datastore?
(I don’t mean setting it to None)
After changing your model, newer rows added will not have the column. Existing rows will continue to have the column. You should be able to run an update on the existing data to remove that column using the article given below.
Docs article: https://developers.google.com/appengine/articles/update_schema