Page History

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1. re-encryption completed for cache group
2. last WAL segment in which the key was used was is removed (on node startup should check if the WAL history has been cleared manually)

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When a non-baseline node joins a cluster (with baseline change), it cleans up all existing data, so this should shouldn't be a problem case.

If the node fails during re-encryption, after restarting it must continue re-encryption from the stored offset (if checkpoint failed it should restore physical records from WAL, as usual).

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