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gates / gates (push) Successful in 11s
MEASURED FIRST, then fixed. On the shipped v0.229.0, on demo-hp, an app's Tier-2 copy went from 120 082 104 B (4 database dumps + 3 named-volume tars) to 7 036 B (none of either) in ONE nightly run, and the run recorded itself a success: 'Tier 2 copied docmost -> ... (14.9 KB, 0 leg(s), 0s)'. Evidence: felhom.eu/documentation/audits/DRILL-r403-tier2-delete-2026-08-31/. The mechanism was three individually-correct lines: RunTier2 guards the unit leg with os.Stat only (does the folder exist), rsyncMirror is rsync -a --delete, and nothing between them compared source to destination. An EMPTY unit is a folder that exists. THE GUARD. One predicate, unitCarriesData/unitIsHollow (r403_hollow.go), asking the MANIFEST and never the byte size - a big compose tree with no dumps is dangerous, a tiny unit for a tiny app is fine. Fail closed on an absent or unparseable manifest. RunTier2 skips the unit leg when the source is hollow AND the destination is not; the other legs still run, the run is not failed, and the skip is recorded for the SURFACE (CrossDriveBackup.UnitLegSkipped + UnitPackageDate) as well as logged. --delete STAYS and shrinking stays legal. 07 section 8 row 5's derived-copy rule is unchanged; the fence is exactly one shape. TestR403_DataLegShrinkIsUnaffected is the guard on the guard. THE HONESTY. A preserved package is older than the run that preserved it, so the card carries a notice and the unit-restore confirm names the PACKAGE's date - read from the mirrored manifest's own created_at, not from the status record - plus a clause saying why it is older. THE CAUSE. RestoreTier2Unit now refills a hollow or absent primary unit from the mirror it just restored from, INSIDE the call before returning. The hollow manifest was written two seconds after a restore by the 5-minute capture job; any follow-up job races it. The capture itself is NOT guarded: a capture describing an empty drive as empty is correct, and with the primary refilled there is no hollow state left to describe. Never over a complete primary, never after a failed restore. recordTier2Success and tier2UnitConfirmMsg keep their old signatures as thin callers, so no existing test needed editing. New seam unitRehydrate, separate from tier2Mirror on purpose. 22 new Go tests. Red-proofs run and reverted: A6 (predicate -> size threshold), B1 (guard removed -> the copy's 3 files are DELETED and the seam is called), B6 (a general never-shrink rule -> the shrink case fails), C2 (only-when-hollow dropped -> the complete primary is overwritten).