Page History

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1. Check that all baseline nodes online.
2. Start distributed process GROUP_KEY_CHANGE_PREPARE, each node
   1. verifies that re-encryption not in progress (?)
      
   2. ensures that new key identifier does not exists
   3. adds new key
3. After successful completion of PREPARE, start distributed process GROUP_KEY_CHANGE_FINISH, each node
   1. sets new key for writing
   2. adds the mapping "WAL segment -> *old* key identifier" (to safely cleanup this key in the future)
   3. stores current pages count as total pages for background re-encryption (on applicable partitions).
   4. starts background re-encryption

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