{
  "waveform_index": "data/index/waveform_index.sqlite",
  "index_audit": {
    "scope": "all waveform_segments rows",
    "segment_rows": 159916,
    "missing_required_field_counts": {},
    "invalid_sampling_rows": 0,
    "end_time_formula_mismatch_rows": 0,
    "duplicate_segment_key_rows_beyond_first": 0,
    "exact_nslc_gap_count_within_selected_periods": 4429,
    "exact_nslc_gap_count_by_network": {
      "BK": 485,
      "CI": 2250,
      "NC": 1694
    },
    "exact_nslc_gap_count_by_channel_family": {
      "AB": 1,
      "AC": 4,
      "AD": 4,
      "AM": 1,
      "AN": 1,
      "AP": 2,
      "AR": 1,
      "AS": 4,
      "AT": 1,
      "AW": 1,
      "BH": 192,
      "EH": 76,
      "EP": 201,
      "HH": 195,
      "HJ": 72,
      "HN": 2096,
      "HS": 144,
      "HV": 5,
      "LC": 287,
      "LE": 124,
      "LH": 202,
      "LI": 39,
      "LK": 39,
      "LN": 339,
      "LT": 1,
      "LY": 3,
      "VC": 91,
      "VE": 87,
      "VF": 29,
      "VH": 69,
      "VK": 29,
      "VM": 89
    },
    "exact_nslc_gap_duration_s": {
      "median": 36615.124999876025,
      "p90": 259199.99999985695,
      "p99": 345600.0000002289,
      "maximum": 432000.0000002289
    },
    "exact_nslc_overlap_count_within_selected_periods": 0,
    "exact_nslc_overlap_count_by_network": {},
    "exact_nslc_overlap_count_by_channel_family": {},
    "exact_nslc_overlap_duration_s": {
      "median": null,
      "p90": null,
      "p99": null,
      "maximum": null
    },
    "missing_coordinate_rows": 0
  },
  "hdf5_sample_audit": {
    "scope": "deterministic SHA-256-ordered sample stratified by period, network, and HH/BH/EH/HN channel family",
    "sample_per_stratum": 10,
    "selected_segments": 200,
    "sample_window_seconds": 30.0,
    "counters": {
      "constant_sample_windows": 3,
      "datasets_opened": 200,
      "sample_windows_read": 600
    },
    "metadata_mismatch_examples": [],
    "sample_flag_examples": [
      {
        "dataset_path": "/2019-01-01T00:00:00.000000Z/2019-07-02T00:00:00.000000Z/stations/CI.CHR.--/waveform/HNZ/0",
        "sample_start_index": 0,
        "flag": "constant_window"
      },
      {
        "dataset_path": "/2019-01-01T00:00:00.000000Z/2019-07-02T00:00:00.000000Z/stations/CI.CHR.--/waveform/HNZ/0",
        "sample_start_index": 4318500,
        "flag": "constant_window"
      },
      {
        "dataset_path": "/2019-01-01T00:00:00.000000Z/2019-07-02T00:00:00.000000Z/stations/CI.CHR.--/waveform/HNZ/0",
        "sample_start_index": 8637000,
        "flag": "constant_window"
      },
      {
        "dataset_path": "/2019-01-01T00:00:00.000000Z/2019-07-04T00:00:00.000000Z/stations/NC.C013.01/waveform/HNN/0",
        "sample_start_index": 665936,
        "flag": "nonfinite_values",
        "count": 6000
      },
      {
        "dataset_path": "/2021-01-01T00:00:00.000000Z/2021-11-14T00:00:00.000000Z/stations/BK.FARB.00/waveform/BHE/0",
        "sample_start_index": 1727400,
        "flag": "nonfinite_values",
        "count": 1200
      },
      {
        "dataset_path": "/2021-01-01T00:00:00.000000Z/2021-11-14T00:00:00.000000Z/stations/NC.MINS.--/waveform/HHN/0",
        "sample_start_index": 4318500,
        "flag": "nonfinite_values",
        "count": 3000
      },
      {
        "dataset_path": "/2021-01-01T00:00:00.000000Z/2021-11-14T00:00:00.000000Z/stations/NC.MINS.--/waveform/HHZ/0",
        "sample_start_index": 4318500,
        "flag": "nonfinite_values",
        "count": 3000
      }
    ],
    "sample_values_examined": 1611000,
    "zero_value_fraction": 0.006541278708876474,
    "longest_zero_run_s_in_sample_windows": 30.0,
    "dtype_extreme_value_count": 0,
    "nonfinite_value_count": 13200,
    "large_first_difference_count_20mad": 324,
    "large_first_difference_note": "Diagnostic flag only; large first differences can be genuine seismic signals."
  },
  "interpretation": "Index checks cover every segment row. Sample-value diagnostics do not replace a full-array scan or comparison with upstream MiniSEED samples."
}