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The catalog clobber existed because `if let Ok(bytes)` had a failure arm that was never exercised. Fixing it without covering that arm leaves the next person free to collapse it back. Three tests against a backend whose read fails in a chosen way, counting writes — because what went wrong was not a wrong value but a write that should not have happened at all: - a dehydrated snapshot uploads nothing - an unreadable one uploads nothing either, since "refused" is no more "absent" than "not downloaded" is - and a genuine first sync still uploads, which is the half that keeps `NotFound` distinct from `NotMaterialised` rather than merely cautious Checked against the original shape: the first two fail on it and the third passes. A guard test that cannot tell the bug from the fix is decoration. `async-trait` joins dev-dependencies to stand the double up behind `dyn RemoteBackend`.