pub type ReverseDiffEntry = (Vec<u8>, Option<Vec<u8>>);Expand description
A single reverse-diff entry: (on_disk_key, previous_value_or_none).
on_disk_key is the exact key written to its column family — for storage
CFs this includes the nibble-encoded account-hash prefix. Some(prev)
means the key existed on disk with prev before the commit; None means
the key did not exist on disk (i.e., the commit added it, and a rollback
should remove it).