{
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 "clock_note": "sqlite `timestamp` is nanoseconds on a device-monotonic clock, not epoch; use start_delta_s/end_delta_s to align across devices",
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  "segment_summaries": [
   "segment1 passed"
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  "missing_count": 0,
  "corrupt_count": 0,
  "probe_fail_count": 0,
  "anomalies": []
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}