Tier-2 mirrors each app's whole recovery unit to <dest>/backups/secondary/<app>/recovery-unit/ on
every run and has done for months. Nothing read it. In the one failure Tier-2 exists for - the
primary drive is lost, and the primary unit with it - the surviving copy could not be opened by any
action in the product (07-backup-architecture 6.3, 7.2).
Part 1.2: RestoreFromRecoveryUnitAt(stack, unitDir) holds the whole body; RestoreFromRecoveryUnit is
the thin caller naming the primary unit. ONE implementation, two callers. The SOURCE moves; the
DESTINATION does not - live Docker volumes, the live database container, the guest's definition, all
unchanged. The R-47 mutation order, the secret reconciliation with unit-over-guest precedence, the
fail-closed data-key gate and the no-unit fallback with CountsUnknown are untouched.
reimportDBDumpsAtCtx is the bounded-context twin of reimportDBDumpsFrom; the 35-minute bound is now
named once so the two paths cannot drift. The R-354 volume-replay seam is reused rather than a second
one invented, which is what lets the acceptance test assert the volume leg's source directory.
Part 1.3: RestoreTier2Unit resolves the recorded copy, refuses fail-closed unless the mirror carries a
parseable manifest - a directory is not a package - and delegates. The single-writer flag is taken
inside RestoreFromRecoveryUnitAt, not beside it.
Part 2.1: Tier2Coverage gains UnitRestorable and the copy's dates. CanRestore() is NOT widened; it
still answers only 'can the file restore run?'. One predicate answering two questions is R-356, which
refused 40 running apps for months.
Tests: A2-A6 and B1-B5, plus two non-regression guards. The Tier-2 fixtures build their mirror with
the production RunTier2, so the claim is 'the copy Tier-2 writes is the copy this restore reads'.
Red-proofs: A5 (swap volumes/recreate -> fails on the order), B2 (point the reader back at the
primary -> fails with the mirror never reaching the redeploy, and with permission denied once the
primary tree is unreadable).
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