{
  "tables": [
    {
      "id": "day-window-summary",
      "columns": [
        "day",
        "listed_open_records",
        "listed_closed_records",
        "unknown_or_unparsed_records",
        "after_18_records",
        "denominator"
      ],
      "row_count": 7,
      "units": {
        "start": "Local minutes after midnight",
        "end": "Local minutes after midnight",
        "minutes": "Listed regular interval duration in minutes",
        "after_18_minutes": "Overlap with 18:00–20:00 local time, in minutes",
        "weekly_scheduled_hours": "Sum of seven observed regular intervals divided by 60; complete records only",
        "counts": "Directory records, not verified operating buildings or people"
      },
      "raw_source_identifiers": [
        "branch_name",
        "source_url",
        "retrieved_at_utc"
      ],
      "note": "Los Angeles Public Library city system only. Snapshot: 28 October 2026 in Los Angeles; retrieval across 28–29 October UTC. The 73 directory records include 70 complete regular grids and three missing grids; all 21 unknown day cells stay unknown. Six records carry notices. Listed intervals do not prove actual operation; consult official branch and closure pages before a visit. Evening means overlap with 18:00–20:00 local time. Zero Friday evening overlap applies to 70 observed complete grids, not zero Friday daytime service."
    },
    {
      "id": "unflagged-schedule-sensitivity",
      "columns": [
        "day",
        "unflagged_records_with_interval",
        "unflagged_after_18_records",
        "unflagged_subset_denominator",
        "whole_directory_denominator"
      ],
      "row_count": 7,
      "units": {
        "start": "Local minutes after midnight",
        "end": "Local minutes after midnight",
        "minutes": "Listed regular interval duration in minutes",
        "after_18_minutes": "Overlap with 18:00–20:00 local time, in minutes",
        "weekly_scheduled_hours": "Sum of seven observed regular intervals divided by 60; complete records only",
        "counts": "Directory records, not verified operating buildings or people"
      },
      "raw_source_identifiers": [
        "branch_name",
        "source_url",
        "retrieved_at_utc"
      ],
      "note": "Los Angeles Public Library city system only. Snapshot: 28 October 2026 in Los Angeles; retrieval across 28–29 October UTC. The 73 directory records include 70 complete regular grids and three missing grids; all 21 unknown day cells stay unknown. Six records carry notices. Listed intervals do not prove actual operation; consult official branch and closure pages before a visit. Sensitivity excludes all six notice-bearing records, leaving 67 complete no-notice records. This is not verification that 67 buildings are operating."
    },
    {
      "id": "weekly-hours-distribution",
      "columns": [
        "weekly_scheduled_hours",
        "records",
        "denominator_complete_records"
      ],
      "row_count": 4,
      "units": {
        "start": "Local minutes after midnight",
        "end": "Local minutes after midnight",
        "minutes": "Listed regular interval duration in minutes",
        "after_18_minutes": "Overlap with 18:00–20:00 local time, in minutes",
        "weekly_scheduled_hours": "Sum of seven observed regular intervals divided by 60; complete records only",
        "counts": "Directory records, not verified operating buildings or people"
      },
      "raw_source_identifiers": [
        "branch_name",
        "source_url",
        "retrieved_at_utc"
      ],
      "note": "Los Angeles Public Library city system only. Snapshot: 28 October 2026 in Los Angeles; retrieval across 28–29 October UTC. The 73 directory records include 70 complete regular grids and three missing grids; all 21 unknown day cells stay unknown. Six records carry notices. Listed intervals do not prove actual operation; consult official branch and closure pages before a visit. Distribution uses only 70 complete seven-day grids. Weekly hours include listed regular intervals, without holiday or closure adjustments; the 20-hour grid is temporary Palisades service."
    },
    {
      "id": "source-notice-adjudication",
      "columns": [
        "branch_name",
        "source_notice_code",
        "published_start",
        "published_end",
        "factual_interpretation",
        "full_regular_grid_present",
        "source_url",
        "retrieved_at_utc"
      ],
      "row_count": 6,
      "units": {
        "start": "Local minutes after midnight",
        "end": "Local minutes after midnight",
        "minutes": "Listed regular interval duration in minutes",
        "after_18_minutes": "Overlap with 18:00–20:00 local time, in minutes",
        "weekly_scheduled_hours": "Sum of seven observed regular intervals divided by 60; complete records only",
        "counts": "Directory records, not verified operating buildings or people"
      },
      "raw_source_identifiers": [
        "branch_name",
        "source_url",
        "retrieved_at_utc"
      ],
      "note": "Los Angeles Public Library city system only. Snapshot: 28 October 2026 in Los Angeles; retrieval across 28–29 October UTC. The 73 directory records include 70 complete regular grids and three missing grids; all 21 unknown day cells stay unknown. Six records carry notices. Listed intervals do not prove actual operation; consult official branch and closure pages before a visit. These are source assertions and original factual interpretations. An undated today notice is not assigned a verified event date. Temporary and offsite service is not a restored original building."
    },
    {
      "id": "all-73-branch-schedules",
      "columns": [
        "branch_name",
        "weekly_minutes",
        "weekday_after_18_minutes",
        "weekend_minutes",
        "notice_presence",
        "hours_ambiguous",
        "source_url",
        "retrieved_at_utc"
      ],
      "row_count": 73,
      "units": {
        "start": "Local minutes after midnight",
        "end": "Local minutes after midnight",
        "minutes": "Listed regular interval duration in minutes",
        "after_18_minutes": "Overlap with 18:00–20:00 local time, in minutes",
        "weekly_scheduled_hours": "Sum of seven observed regular intervals divided by 60; complete records only",
        "counts": "Directory records, not verified operating buildings or people"
      },
      "raw_source_identifiers": [
        "branch_name",
        "source_url",
        "retrieved_at_utc"
      ],
      "note": "Los Angeles Public Library city system only. Snapshot: 28 October 2026 in Los Angeles; retrieval across 28–29 October UTC. The 73 directory records include 70 complete regular grids and three missing grids; all 21 unknown day cells stay unknown. Six records carry notices. Listed intervals do not prove actual operation; consult official branch and closure pages before a visit. Minutes are published regular-schedule totals. Empty totals mean unknown, not zero. Branch names, official URLs and actual retrieval timestamps remain exact."
    },
    {
      "id": "all-511-source-cited-day-cells",
      "columns": [
        "branch_name",
        "day",
        "literal_hours",
        "status",
        "start",
        "end",
        "minutes",
        "after_18_minutes",
        "source_url",
        "retrieved_at_utc",
        "exception_notice_present"
      ],
      "row_count": 511,
      "units": {
        "start": "Local minutes after midnight",
        "end": "Local minutes after midnight",
        "minutes": "Listed regular interval duration in minutes",
        "after_18_minutes": "Overlap with 18:00–20:00 local time, in minutes",
        "weekly_scheduled_hours": "Sum of seven observed regular intervals divided by 60; complete records only",
        "counts": "Directory records, not verified operating buildings or people"
      },
      "raw_source_identifiers": [
        "branch_name",
        "source_url",
        "retrieved_at_utc"
      ],
      "note": "Los Angeles Public Library city system only. Snapshot: 28 October 2026 in Los Angeles; retrieval across 28–29 October UTC. The 73 directory records include 70 complete regular grids and three missing grids; all 21 unknown day cells stay unknown. Six records carry notices. Listed intervals do not prove actual operation; consult official branch and closure pages before a visit. Start and end are local clock minutes after midnight. Blank start/end is not applicable for an explicit closed row and unknown for a missing grid. Blank numeric durations remain unknown; explicit closed durations are zero. Literal schedule strings are preserved as factual source tokens."
    }
  ],
  "status": {
    "listed_interval": "Positive published regular interval",
    "listed_closed": "Explicit source Closed; zero duration",
    "unknown": "No complete regular seven-day grid; unknown duration, not zero"
  },
  "booleans": {
    "True": true,
    "False": false
  },
  "missingness": "Empty numeric cells are unknown except start/end for listed_closed, which are not applicable. Literal strings and notice date phrases remain exact.",
  "notice_codes": [
    "building_construction_notice_with_offsite_popup",
    "dated_maintenance_notice",
    "dated_maintenance_notice_with_regular_grid",
    "temporary_parking_lot_service",
    "undated_today_notice"
  ]
}