Live Vault Audit Uncovers Silent Infrastructure Failure Missed by Code Reviews

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During a migration between two credential-storage systems, an engineer ran a live audit script that queried each vault directly instead of relying on code logic alone. Every lookup to the legacy vault failed — not due to missing secrets, but because the vault itself had stopped resolving entirely. The failure had gone undetected because the code caught the error, logged a warning, and continued without raising any alert. Further investigation revealed the legacy vault's credentials were never actually re-read in practice, meaning the silent failure had caused no real-world harm — but only by chance. The incident highlights how code review confirms internal logic consistency, not whether the underlying infrastructure it depends on still exists.

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