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gates / gates (push) Successful in 12s
Found by v0.220.0's own live walk on its first real run. writeSafetyDump
captures its DiscoveredDB before the stop; the DB-only start then re-creates the
container with a new id, so the rollback's docker exec hit a dead container and
sat in waitDBReady for 30s. The app was held for an infrastructure reason while
its data was recoverable.
Re-discover and match by {stack, engine} - what reimportDBDumpsFrom already did.
Fail closed when the container cannot be found.
No unit test caught it because they all inject the import seam and never look at
container identity. The new test asserts the identity handed to the import.