I wonder how does the "ZDB is append only" works in practice.
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Any pruning due to wasted capacity?
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How about data retention compliance (law)? Thus the need to really remove the data or to forget the keys to encrypted data and instruct ZDB to reuse the related storage blocks?
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How do you correct a mistake? I.e. you've been deploying huge amounts of sensitive data for months on your distributed network of storage & computing units until you realized that you should not. How will you remove that part of history?