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A reinstall mints a new PBS key K while R-241 keeps the restic password, so the supersession rule (restic sha only) overwrote the only copy of the old K and every pre-reinstall whole-guest archive became unopenable for good. The current row is now also retained when the key fingerprint changes (case and space ignored; an empty fingerprint is unknown, not a change). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS