{
  "schema": "pg36-ch16-fixture-manifest-v1",
  "fixture": "ch16-spatiotemporal-v1",
  "frozen_at": "2026-07-29T00:00:00Z",
  "attempts": {
    "path": "frozen-attempts.csv",
    "rows": 13,
    "distinct_events": 12,
    "sha256": "7fa1aadbba029061fbc7eb34c9f6285eabb38b438e7d0c0c8c6b820cdc738ccf"
  },
  "geofences": {
    "path": "frozen-geofences.csv",
    "rows": 4,
    "zones": 3,
    "sha256": "b2da791c7adba720cf9f4fc1123546eb08036bb60ed8ed778ae5b8dc60435c66"
  },
  "hubs": {
    "path": "frozen-hubs.csv",
    "rows": 3,
    "sha256": "bd56e0f8f978495bc1e677270f285628163a3edc1656fe99a2a7173ffe8e18af"
  },
  "loader": {
    "path": "fixture.sql",
    "sha256": "b254bf5d695cf1ab738fc71b573544ef526146355b18d60b99f342ca1536a860"
  },
  "time": {
    "event_time": "occurred_at",
    "ingest_time": "received_at",
    "valid_time": "valid_during",
    "storage_timezone": "UTC",
    "display_timezone_probe": "America/New_York",
    "range_bounds": "[)"
  },
  "space": {
    "coordinates": "project-authored synthetic longitude/latitude",
    "srid": 4326,
    "geometry_role": "topology, predicates, and planar index probes",
    "geography_role": "meter-based distance predicates",
    "external_geodata": false
  },
  "license": {
    "text": "project-owned synthetic fixture; repository terms apply",
    "coordinates": "synthetic coordinates; no external geodata license"
  },
  "limitations": [
    "The events and coordinates are synthetic and intentionally tiny.",
    "The fixture proves semantics, routing, constraints, and index path availability, not production performance.",
    "The coordinates resemble a city grid but are not an authoritative map or routing data set.",
    "The direct PostgreSQL run does not claim a Pigsty L1 deployment.",
    "TimescaleDB is a documented optional decision branch and is not part of this frozen fixture."
  ]
}