{
  "schema_id": "la.archive.soil-media.v1",
  "schema_version": 1,
  "pack_id": "soil-ex-001",
  "created_at": "2026-07-26T00:00:00.000Z",
  "media": {
    "profile_name": "Street tree pit — engineered",
    "profile_class": "engineered",
    "depth_mm": 900,
    "composition_note": "Sandy loam over drainage layer; pH target 6.0–7.0"
  },
  "tla185_refs": {
    "record_id": null,
    "field_paths": ["site.soil_profile", "planting.zone_ref"]
  }
}