{
  "general": {
    "null": "Unknown or not applicable; never zero",
    "observed_at": "Capture time, not necessarily reporting period",
    "source": "Publisher URL; raw response catalog supplies checksum and request",
    "phase_at_capture": "Future/active/ended using advertised start/end and snapshot date",
    "enrolled_registrations": "Source already_enrolled; not attendance or unique people",
    "reported_waitlist_entries": "Explicit count in a public section-level waiting-list message at detail_observed_at. Not unique people or attendance. No explicit count remains NULL.",
    "detail_observed_at": "Retrieval timestamp for the public detail response, which may differ from initial catalog capture.",
    "apparent_capacity_raw": "Source total_open; denominator semantics unverified",
    "fill_ratio": "Withheld until denominator independently verified",
    "counter_candidates_500m": "Centroid proximity screen only; not a park-counter assignment",
    "program_sections_captured": "Count of distinct activity IDs linked through reviewed alias/exact name",
    "utilization_percent": "NULL; no valid universal denominator",
    "hours_observed_at": "Actual retrieval time of the matched official page; fallback older extraction date retained. Published hours do not independently verify operation."
  },
  "table_fields": {
    "garden_supply": [
      "object_id",
      "source_property_id",
      "property_id",
      "garden",
      "source_status",
      "recorded_total_plots",
      "assigned_plots",
      "usable_plots_verified",
      "occupancy_ratio",
      "source",
      "interpretation"
    ],
    "facility_evidence_register": [
      "venue_id",
      "venue",
      "property_id",
      "program_sections",
      "observed_at",
      "evidence_scope",
      "join_status",
      "example_source"
    ],
    "published_property_page_context": [
      "source",
      "observed_at",
      "published_hours",
      "amenity_labels",
      "interpretation"
    ],
    "reviewed_report_facts": [
      "source",
      "source_sha256",
      "locator",
      "reporting_period",
      "verification",
      "value_kind",
      "current_value",
      "denominator",
      "site",
      "property_id",
      "measure",
      "value",
      "unit",
      "scope",
      "interpretation"
    ],
    "reservation_resources": [
      "resource_id",
      "center_id",
      "name",
      "center_name",
      "property_id",
      "resource_type",
      "resource_kind",
      "published_maximum_attendees",
      "capacity_label",
      "reserve_by",
      "hours",
      "restrictions",
      "observed_at",
      "source",
      "reserved_hours",
      "released_bookable_hours",
      "reservation_utilization"
    ],
    "reservation_availability": [
      "resource_id",
      "date",
      "observed_at",
      "source_status_code",
      "published_intervals",
      "holiday_description",
      "source",
      "actual_reserved_hours",
      "interpretation"
    ],
    "resource_relationships": [
      "resource_id",
      "relationship",
      "related_source_record",
      "source",
      "aggregation_rule"
    ],
    "program_observations": [
      "activity_id",
      "name",
      "property_id",
      "venue",
      "venue_raw",
      "start",
      "end",
      "phase_at_capture",
      "observed_at",
      "enrolled_registrations",
      "reported_waitlist_entries",
      "waitlist_source_message",
      "detail_observed_at",
      "detail_source",
      "category",
      "activity_type",
      "openings",
      "apparent_capacity_raw",
      "capacity_validation",
      "fill_ratio",
      "registration_window_status",
      "registration_dates",
      "schedule",
      "published_sessions",
      "source_status",
      "flags",
      "source"
    ],
    "property_crosswalk": [
      "source_kind",
      "source_id",
      "source_label",
      "property_id",
      "status",
      "method",
      "source",
      "facility_ids",
      "center_ids"
    ],
    "park_evidence_matrix": [
      "property_id",
      "name",
      "slug",
      "district",
      "property_type",
      "public_entry",
      "recreational_use_applicability",
      "program_sections_captured",
      "enrollment_evidence",
      "attendance",
      "reservation_catalog_sites",
      "reservation_catalog_observed_at",
      "reservation_resources_captured",
      "physical_reservation_resources",
      "permit_products_captured",
      "forward_availability",
      "reservation_hours",
      "bookable_hours",
      "garden_occupancy",
      "garden_recorded_total_plots",
      "counter_candidates_500m",
      "counter_locations_within_boundary",
      "counter_park_assignment",
      "hours",
      "hours_observed_at",
      "hours_source",
      "event_listings_captured",
      "events_observed_at",
      "closures",
      "survey",
      "current_30_day_use",
      "current_90_day_use",
      "utilization_percent"
    ],
    "park_use_profiles": [
      "property_id",
      "name",
      "slug",
      "district",
      "property_type",
      "public_entry",
      "recreational_use_applicability",
      "program_sections_captured",
      "enrollment_evidence",
      "attendance",
      "reservation_catalog_sites",
      "reservation_catalog_observed_at",
      "reservation_resources_captured",
      "physical_reservation_resources",
      "permit_products_captured",
      "forward_availability",
      "reservation_hours",
      "bookable_hours",
      "garden_occupancy",
      "garden_recorded_total_plots",
      "counter_candidates_500m",
      "counter_locations_within_boundary",
      "counter_park_assignment",
      "hours",
      "hours_observed_at",
      "hours_source",
      "event_listings_captured",
      "events_observed_at",
      "closures",
      "survey",
      "current_30_day_use",
      "current_90_day_use",
      "utilization_percent",
      "observed_at",
      "program_phases",
      "program_source_ids",
      "reservation_resource_ids",
      "counter_candidates",
      "counter_locations",
      "what_this_establishes",
      "historical_report_facts",
      "reported_reasons",
      "observed_associations",
      "causal_evidence",
      "next_evidence_needed",
      "interpretation"
    ],
    "source_inventory": [
      "id",
      "url",
      "method",
      "request_json",
      "family",
      "publisher",
      "title",
      "discovered_from",
      "status",
      "retrieved_at",
      "final_url",
      "http_status",
      "content_type",
      "bytes",
      "sha256",
      "raw_path",
      "reporting_period",
      "geography",
      "license",
      "notes"
    ],
    "gap_register": [
      "family",
      "title",
      "url",
      "status",
      "notes"
    ],
    "historical_program_observations": [
      "activity_id",
      "observed_at",
      "start",
      "end",
      "property_id",
      "enrolled_registrations",
      "openings",
      "source_snapshot"
    ]
  },
  "gis_fields": "Original field definitions, aliases, domains, units, descriptions and relationships in each normalized/gis/*.json metadata object",
  "performance_fields": "Original Notes, units and reporting periods in performance-measures.json",
  "counter_fields": "Detector modes, direction, timezone and AASHTO method in counters/*-metadata.json; missing days are not zero"
}