{
  "what": "同一个 Steam 全球成就百分比接口, 相隔 2 个日历日的两次读数与差值 (API 对 API)。",
  "why": "站上按这些数字分了稀有度档位, 所以它们移动多快本身就是结论的一部分。ZENONIA 1 于 2026-08-31 上架, 这两次读数落在发售后的头几天里。**本文件不主张任何机制**: 接口只返回百分比, 不返回拥有者数, 分母未公开; 而且并非所有行都朝同一方向移动。两次读数能说明变了多少、往哪边变, 说明不了为什么。",
  "join_note": "差值只在 Steam API 的内部成就 id 之间计算。**没有**把 id 映射到Community 页的显示名 —— 08-31 当天两个来源里 5 条相差超过 1 个百分点 (最大 5.5), 按百分比排序去对齐必然在这些行上错位。",
  "request": {
    "method": "GET",
    "url": "https://api.steampowered.com/ISteamUserStats/GetGlobalAchievementPercentagesForApp/v2/?gameid=4538960",
    "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)"
  },
  "time_note": "首次读数只记了日期 2026-08-31, **没有记 UTC 时刻** —— 所以两次之间究竟隔了多久无法精确到小时, 只能说是相隔 2 个日历日的两次快照。这是当时留证据的疏漏, 记在这里而不是含糊过去。",
  "then": {
    "captured": "2026-08-31",
    "file": "03-steam-global-achievement-pct.json",
    "time_of_day": null
  },
  "now": {
    "captured": "2026-09-02",
    "file": "live/steam-achievement-percentages.json",
    "http_status": 200,
    "sha256": "ac284283095192aa18a70307a406076072d04f3c467d32c6217d21c3c16d1b6d"
  },
  "summary": {
    "capturedThen": "2026-08-31",
    "capturedNow": "2026-09-02",
    "calendarDaysBetween": 2,
    "total": 44,
    "moved": 44,
    "fell": 42,
    "rose": 2,
    "biggestRise": 6.3,
    "medianThen": 16.3,
    "medianNow": 4.5,
    "medianAbsMove": 7.7,
    "biggestMove": -19.1,
    "biggestThen": 63.6,
    "biggestNow": 44.5,
    "under10Then": 13,
    "under10Now": 31,
    "sourceGapOver1pt": 5,
    "sourceGapMax": 5.5,
    "evidenceFile": "27-achievement-drift-20260902.json",
    "priorReadings": [
      {
        "date": "2026-09-01",
        "file": "23-achievement-drift-20260901.json"
      }
    ],
    "readingNumber": 3,
    "unchanged": 0
  },
  "rows_by_api_id": [
    {
      "id": "SteamAchive_14_1",
      "then": 63.6,
      "now": 44.5,
      "delta": -19.1
    },
    {
      "id": "SteamAchive_42_1",
      "then": 25.4,
      "now": 7.0,
      "delta": -18.4
    },
    {
      "id": "SteamAchive_58_1",
      "then": 29.0,
      "now": 11.5,
      "delta": -17.5
    },
    {
      "id": "SteamAchive_35_1",
      "then": 29.0,
      "now": 12.2,
      "delta": -16.8
    },
    {
      "id": "SteamAchive_19_1",
      "then": 20.0,
      "now": 3.3,
      "delta": -16.7
    },
    {
      "id": "SteamAchive_38_1",
      "then": 18.1,
      "now": 1.7,
      "delta": -16.4
    },
    {
      "id": "SteamAchive_45_1",
      "then": 16.3,
      "now": 1.2,
      "delta": -15.1
    },
    {
      "id": "SteamAchive_43_1",
      "then": 18.1,
      "now": 3.2,
      "delta": -14.9
    },
    {
      "id": "SteamAchive_10_1",
      "then": 23.6,
      "now": 9.2,
      "delta": -14.4
    },
    {
      "id": "SteamAchive_3_1",
      "then": 14.5,
      "now": 0.6,
      "delta": -13.9
    },
    {
      "id": "SteamAchive_36_1",
      "then": 20.0,
      "now": 6.3,
      "delta": -13.7
    },
    {
      "id": "SteamAchive_44_1",
      "then": 14.5,
      "now": 1.4,
      "delta": -13.1
    },
    {
      "id": "SteamAchive_25_1",
      "then": 56.3,
      "now": 44.8,
      "delta": -11.5
    },
    {
      "id": "SteamAchive_48_1",
      "then": 16.3,
      "now": 4.8,
      "delta": -11.5
    },
    {
      "id": "SteamAchive_9_1",
      "then": 16.3,
      "now": 5.2,
      "delta": -11.1
    },
    {
      "id": "SteamAchive_34_1",
      "then": 36.3,
      "now": 26.0,
      "delta": -10.3
    },
    {
      "id": "SteamAchive_40_1",
      "then": 29.0,
      "now": 18.8,
      "delta": -10.2
    },
    {
      "id": "SteamAchive_1_1",
      "then": 70.9,
      "now": 61.1,
      "delta": -9.8
    },
    {
      "id": "SteamAchive_53_1",
      "then": 14.5,
      "now": 4.7,
      "delta": -9.8
    },
    {
      "id": "SteamAchive_24_1",
      "then": 10.9,
      "now": 1.3,
      "delta": -9.6
    },
    {
      "id": "SteamAchive_25_3",
      "then": 18.1,
      "now": 9.2,
      "delta": -8.9
    },
    {
      "id": "SteamAchive_15_1",
      "then": 9.0,
      "now": 1.2,
      "delta": -7.8
    },
    {
      "id": "SteamAchive_41_1",
      "then": 12.7,
      "now": 5.2,
      "delta": -7.5
    },
    {
      "id": "SteamAchive_37_1",
      "then": 10.9,
      "now": 3.9,
      "delta": -7.0
    },
    {
      "id": "SteamAchive_8_1",
      "then": 10.9,
      "now": 4.2,
      "delta": -6.7
    },
    {
      "id": "SteamAchive_52_1",
      "then": 9.0,
      "now": 2.3,
      "delta": -6.7
    },
    {
      "id": "SteamAchive_25_2",
      "then": 38.1,
      "now": 32.6,
      "delta": -5.5
    },
    {
      "id": "SteamAchive_49_1",
      "then": 7.2,
      "now": 1.8,
      "delta": -5.4
    },
    {
      "id": "SteamAchive_16_1",
      "then": 5.4,
      "now": 0.2,
      "delta": -5.2
    },
    {
      "id": "SteamAchive_33_1",
      "then": 67.2,
      "now": 62.3,
      "delta": -4.9
    },
    {
      "id": "SteamAchive_2_1",
      "then": 5.4,
      "now": 0.7,
      "delta": -4.7
    },
    {
      "id": "SteamAchive_29_1",
      "then": 5.4,
      "now": 0.8,
      "delta": -4.6
    },
    {
      "id": "SteamAchive_51_1",
      "then": 10.9,
      "now": 6.9,
      "delta": -4.0
    },
    {
      "id": "SteamAchive_50_1",
      "then": 3.6,
      "now": 0.1,
      "delta": -3.5
    },
    {
      "id": "SteamAchive_47_1",
      "then": 3.6,
      "now": 0.2,
      "delta": -3.4
    },
    {
      "id": "SteamAchive_46_1",
      "then": 3.6,
      "now": 0.5,
      "delta": -3.1
    },
    {
      "id": "SteamAchive_57_1",
      "then": 3.6,
      "now": 0.6,
      "delta": -3.0
    },
    {
      "id": "SteamAchive_39_1",
      "then": 3.6,
      "now": 1.3,
      "delta": -2.3
    },
    {
      "id": "SteamAchive_5_1",
      "then": 1.8,
      "now": 0.0,
      "delta": -1.8
    },
    {
      "id": "SteamAchive_4_1",
      "then": 1.8,
      "now": 0.6,
      "delta": -1.2
    },
    {
      "id": "SteamAchive_11_1",
      "then": 52.7,
      "now": 52.2,
      "delta": -0.5
    },
    {
      "id": "SteamAchive_56_1",
      "then": 49.0,
      "now": 48.5,
      "delta": -0.5
    },
    {
      "id": "SteamAchive_18_1",
      "then": 94.5,
      "now": 98.4,
      "delta": 3.9
    },
    {
      "id": "SteamAchive_7_1",
      "then": 47.2,
      "now": 53.5,
      "delta": 6.3
    }
  ]
}