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:passwd used to wrap the same master key under the new password, so an old diary.db (a pre-* snapshot, an old revision on Proton Drive) and the old password still opened every sealed file. It now makes a new master key. The old password opens nothing from that moment; the old master key is kept, sealed under the new one, in two new vault columns, only until every sealed file has been re-sealed. A background worker does that while the vault is open, without holding it open. Each file gets a new id with its file key wrapped under the new master key; its records are copied as they are. The move goes through the same repointing as :encrypt, so the old id is put on backup_retired and the mirror purges it from Drive. Which files are left is read off their headers, so a lock or a restart halfway only pauses the work until the next unlock. Once none is left, the old key is dropped. Readers take a Keyring that tries the current key, then the retired one. A second :passwd is refused until the first has finished. :vault shows the progress. Every sealed file is uploaded to Proton once more.