Cost: 1 credit. Per meeting: the CURRENT official track condition, weather and rail position (Racing Australia, AU thoroughbred meetings, refreshed every two hours) and the day's CHANGE LOG — every transition we observed, with the previous value beside the new one, when it was seen and which feed saw it.

Two kinds of change row, told apart by source. racing_australia rows come from RA's own meeting page, so they are the official rating and carry the rail; bookmaker rows (betright, ladbrokes_au, ...) come from a book's race page moving between two of our polls and carry race_id. A book row can land minutes before RA re-publishes, and a book's spelling ("Soft (6)") differs from RA's ("Soft 6"); the log compares normalised values per feed, so the same rating spelled two ways never appears as a change, and a book that merely lags another produces no row.

Baselines. The first RA row for a meeting has every prev_* null: it is the state when we first read the page (about two days out), not a change. Bookmaker rows are only ever written for a genuine transition, so they always carry a prev_track_condition.

Coverage. Official state is AU thoroughbred only — RA publishes nothing for greyhounds or harness, so those meetings appear here only when a book reported a change, with current labelled by that book. New Zealand meetings likewise.

One entry per meeting, whatever each feed calls it (2026-09-10). RA welds the sponsor into its own venue key ('Picklebet Park Warwick') and the books send the bare town ('Warwick'); both spellings are folded onto one meeting by venue_id, by the sponsor word-subset rule, and (for a course inside a parent racecourse, e.g. the books' 'Randwick' against RA's 'Kensington') by venue_site, each fold refusing to act unless exactly one candidate meeting qualifies and every change row on the bookmaker key is positively categorised thoroughbred. merged_from lists every raw venue_norm folded in and official_venue_norm names RA's spelling, so a join on either old string still finds the meeting, and venue selects it by any of them. A merged entry is published under RA's spelling, because a bookmaker's can be ambiguous about which course of a complex ran ('sandown' for a Sandown HILLSIDE card) and venue_id must never name the wrong track; where RA's spelling is not yet a venue-registry entry its venue_id is that spelling's slug ('picklebet-park-warwick'), which is unmapped rather than wrong.

Mixed current. current is built field by field: RA's official block wherever RA published a value, a book filling only a field RA left null, and RA's own later row superseding either. current.sources names the feed behind each value field and current.field_as_of when it was observed; the block-level source reads mixed when more than one feed is behind the block, and the block-level as_of is the OLDEST of the per-field instants, so neither overstates what the block knows. changes keeps every row from both feeds in one sequence.

going / going_rating sit beside track_condition (and prev_going / prev_going_rating beside prev_track_condition) as the same vocabulary /v1/racing/horses/form publishes, so 'Soft 6', 'Soft (6)' and 'Good4' need one parser and not three. The raw string is unchanged.

The live endpoints carry the same signal per race as track_condition_changed_at — the instant of the latest logged transition for that race's meeting — so a poller reading /v1/racing/changes need not call this to know something moved; call this for the sequence.

How far back (changed 2026-09-29). Any day from coverage_from — the first meeting day the store holds, read from the tables on every call — up to three days ahead. Two floors sit under it and the response names both: the change log reaches back to 2026-09-07, while Racing Australia's own meeting block (official_block_from) is held only from 2026-09-26, because until 2026-09-29 it was deleted three days after each meeting; it is kept permanently since. On a day between the two, current and changes come from the log alone — RA did publish that day, its block is simply gone. A date before coverage_from is a free 422 whose detail names the floor, and so is a malformed one.

{
  "coverage_from": "2026-09-07",
  "date": "2026-09-10",
  "meetings": [
    {
      "category": "horse",
      "changes": [
        {
          "category": "horse",
          "going": "Good",
          "going_rating": 4,
          "observed_at": "2026-09-09T04:16:29Z",
          "rail": "True",
          "source": "racing_australia",
          "track_condition": "Good 4",
          "weather": "Windy"
        },
        {
          "category": "horse",
          "going": "Good",
          "going_rating": 4,
          "observed_at": "2026-09-10T02:36:58Z",
          "prev_going": "Good",
          "prev_going_rating": 3,
          "prev_track_condition": "Good3",
          "race_id": "race_123",
          "source": "betgold",
          "track_condition": "Good4"
        }
      ],
      "current": {
        "as_of": "2026-09-10T02:17:24Z",
        "field_as_of": {
          "penetrometer": "2026-09-10T02:17:24Z",
          "rail": "2026-09-10T02:17:24Z",
          "track_condition": "2026-09-10T02:17:24Z",
          "track_type": "2026-09-10T02:17:24Z",
          "weather": "2026-09-10T02:17:24Z"
        },
        "going": "Good",
        "going_rating": 4,
        "penetrometer": "5.63",
        "rail": "True",
        "source": "racing_australia",
        "sources": {
          "penetrometer": "racing_australia",
          "rail": "racing_australia",
          "track_condition": "racing_australia",
          "track_type": "racing_australia",
          "weather": "racing_australia"
        },
        "track_condition": "Good 4",
        "track_type": "Turf",
        "weather": "Windy"
      },
      "merged_from": [
        "picklebet park warwick",
        "warwick"
      ],
      "official_venue_norm": "picklebet park warwick",
      "venue": "picklebet park warwick",
      "venue_id": "picklebet-park-warwick",
      "venue_norm": "picklebet park warwick",
      "venue_site": "picklebet-park-warwick"
    }
  ],
  "note": "…",
  "official_block_from": "2026-09-07"
}