{
  "total": 2,
  "source": "d1",
  "tracking_since": "2026-10-25T12:38:37.716Z",
  "source_rechecks": {
    "rows": 332,
    "series": 250,
    "last_checked_at": "2026-10-25T13:38:37.000Z",
    "latest_result_counts": {
      "confirmed": 240,
      "unreachable": 5,
      "needs_review": 4,
      "changed": 1
    },
    "method": "Each source URL is fetched and the recorded numbers are looked for in the page (PDFs via pdftotext); anything not confirmed is reviewed by a human. Log: /downloads/price_rechecks.jsonl"
  },
  "observations": [
    {
      "id": "po_20261025_3b986b4b2886",
      "series_key": "ps_9df3bbe415678ca8",
      "kind": "benchmark",
      "use_case_id": "chimney-inspection",
      "use_case_ids": [
        "chimney-inspection"
      ],
      "provider_id": null,
      "description": "Drone inspection of one chimney stack (four faces, crown, flashings, photo report) (C-DRONE price guide, France, observed 2026 range, excl. VAT)",
      "low": 150,
      "high": 300,
      "currency": "EUR",
      "unit": "per stack",
      "region": "FR",
      "source_url": "https://c-drone.fr/en/guides/chimney-stack-flue-drone-inspection-roof-price/",
      "as_of": "2026-09-22",
      "observed_at": "2026-10-25T20:26:06.955Z",
      "content_hash": "sha256:3b986b4b2886af0f23e47e1848aadb168926aeeb38ada94b1e83ba3915b1ca23",
      "supersedes": null,
      "origin": "build",
      "change_reason": null,
      "current": true,
      "usd": {
        "currency": "USD",
        "low": 168,
        "high": 336,
        "fx": {
          "pair": "EUR/USD",
          "rate": 1.11929,
          "eur_per_usd": 0.89342,
          "rate_date": "2026-10-23",
          "source": "European Central Bank reference rates via Frankfurter",
          "source_url": "https://api.frankfurter.dev/v1/latest?base=USD"
        },
        "note": "Converted at the published reference rate on 2026-10-23, not at the price's as_of date. Indicative only."
      }
    },
    {
      "id": "po_20261025_9889c3ebc5fe",
      "series_key": "ps_53c56b31745ffa1c",
      "kind": "benchmark",
      "use_case_id": "chimney-inspection",
      "use_case_ids": [
        "chimney-inspection"
      ],
      "provider_id": null,
      "description": "Full drone inspection of an industrial chimney 40–80 m (visual + thermal + verticality report) (C-DRONE price guide, France, observed 2026 range, excl. VAT)",
      "low": 800,
      "high": 1400,
      "currency": "EUR",
      "unit": "per structure",
      "region": "FR",
      "source_url": "https://c-drone.fr/en/guides/industrial-chimney-silo-inspection-drone/",
      "as_of": "2026-09-22",
      "observed_at": "2026-10-25T20:26:06.955Z",
      "content_hash": "sha256:9889c3ebc5fe6f08f68b30886a150dce3603b0d621b0b846ff815b35eaa7151c",
      "supersedes": null,
      "origin": "build",
      "change_reason": null,
      "current": true,
      "usd": {
        "currency": "USD",
        "low": 895,
        "high": 1567,
        "fx": {
          "pair": "EUR/USD",
          "rate": 1.11929,
          "eur_per_usd": 0.89342,
          "rate_date": "2026-10-23",
          "source": "European Central Bank reference rates via Frankfurter",
          "source_url": "https://api.frankfurter.dev/v1/latest?base=USD"
        },
        "note": "Converted at the published reference rate on 2026-10-23, not at the price's as_of date. Indicative only."
      }
    }
  ],
  "series": [
    {
      "series_key": "ps_9df3bbe415678ca8",
      "kind": "benchmark",
      "use_case_id": "chimney-inspection",
      "provider_id": null,
      "description": "Drone inspection of one chimney stack (four faces, crown, flashings, photo report) (C-DRONE price guide, France, observed 2026 range, excl. VAT)",
      "currency": "EUR",
      "unit": "per stack",
      "region": "FR",
      "source_url": "https://c-drone.fr/en/guides/chimney-stack-flue-drone-inspection-roof-price/",
      "observations": 1,
      "first_observed_at": "2026-10-25T20:26:06.955Z",
      "last_observed_at": "2026-10-25T20:26:06.955Z",
      "current": true,
      "latest": {
        "low": 150,
        "high": 300,
        "as_of": "2026-09-22",
        "id": "po_20261025_3b986b4b2886"
      },
      "trend": null,
      "last_rechecked": null
    },
    {
      "series_key": "ps_53c56b31745ffa1c",
      "kind": "benchmark",
      "use_case_id": "chimney-inspection",
      "provider_id": null,
      "description": "Full drone inspection of an industrial chimney 40–80 m (visual + thermal + verticality report) (C-DRONE price guide, France, observed 2026 range, excl. VAT)",
      "currency": "EUR",
      "unit": "per structure",
      "region": "FR",
      "source_url": "https://c-drone.fr/en/guides/industrial-chimney-silo-inspection-drone/",
      "observations": 1,
      "first_observed_at": "2026-10-25T20:26:06.955Z",
      "last_observed_at": "2026-10-25T20:26:06.955Z",
      "current": true,
      "latest": {
        "low": 800,
        "high": 1400,
        "as_of": "2026-09-22",
        "id": "po_20261025_9889c3ebc5fe"
      },
      "trend": null,
      "last_rechecked": null
    }
  ],
  "note": "Only one observation per series so far: we started recording every price on 2026-10-25 and re-check every source on a schedule. A trend appears when a re-checked source shows a different price (we never overwrite old observations).",
  "pagination": {
    "total": 2,
    "limit": 200,
    "offset": 0,
    "returned": 2,
    "next_offset": null,
    "next": null,
    "prev": null
  },
  "license": "Whirrwork (https://whirrwork.com), CC BY 4.0"
}