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One thing I haven't heard discussed about the "save data forever" model is that in some scenarios you WANT to purge old data and not have it recoverable, for legal reasons.

I guess Datomic is not suited to these situations?

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This seems to be a frequently asked question. From what I've seen on the videos and forums, the Datomic team is also well aware of situations in which this may be legally necessary and are working on providing ways to handle this.

I believe you can set some fields to not store history

https://groups.google.com/forum/#!msg/datomic/WlRM3aXwzIg/RT...

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