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The PII sanitizer's phone regex matches digit pairs like "4880-8614" that span UUID segment boundaries. Random UUIDs occasionally produce these patterns, causing flaky test failures where sourceRun.id gets partially redacted as [REDACTED_PHONE]. Use a fixed hex-letter-heavy UUID for runId so no cross-boundary digit sequence triggers the phone pattern. Co-Authored-By: Paperclip <noreply@paperclip.ing>