Suppose I have a list to delete, I use a batch save to modify all the members of this list to have a field set to a non-valid value. For example, if 0 is invalid for the field 'id', set it to all the members of the list and do one batch save to the kv store.
Then, another call to make a batch delete through the query {'id' : 0}, e.g.
collection.data.delete(query=json.dumps({'id' : 0})
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