# 口径与缺失项

- 用户文件快照；没有读取媒体账户，不能据此确认当前授权或完整历史。
- 只汇总文件中的系列/日期行；缺失日期及空值不补零，文件外的系列未纳入。
- 比率用汇总分子/分母计算；媒体点击口径、历史优化目标和转化归因仍待核实。
- CPM/CTR 对 CPC 的分解是算术关系，不证明竞价、素材或受众变化的因果。
- 不同文件独立保存；重复导入幂等，重叠文件不自动相加或覆盖。
- 内部数据按用户确认的渠道和媒体取值匹配；系列名称、模糊文本和推断渠道不参与匹配。
- 付费与自然用户的差异是描述性对比，不是增量或因果测量；自然渠道可能受到广告的间接影响。
- 内部归因口径为“last non-direct click UTM”，与媒体归因窗口不同，两者转化数不应相加。
- 缺少的内部记录和空值不按 0 计入；受影响的指标按已提供数据计算，并在指标旁注明。

## 检索范围与读取记录

```json
{
  "attempts": [],
  "scope": {
    "account_id": "synthetic-meta-account",
    "attribution_window": null,
    "campaign_count": 3,
    "canonical_imported": false,
    "column_mapping": {
      "account_id": "account_id",
      "campaign_id": "campaign_id",
      "campaign_name": "campaign_name",
      "clicks": "clicks",
      "conversions": "conversions",
      "currency": "currency",
      "date": "date",
      "impressions": "impressions",
      "spend": "spend",
      "timezone": "timezone"
    },
    "conversion_event": null,
    "coverage": "file_rows_only_not_verified_against_platform",
    "currency": "USD",
    "dense_coverage_verified": false,
    "diagnostic_comparison_period": {
      "end": "2026-08-28",
      "start": "2026-08-01"
    },
    "diagnostic_comparison_policy": "explicit_period",
    "first_observed_spend_date": "2026-08-01",
    "grain": "campaign_day",
    "ignored_columns": [],
    "last_observed_spend_date": "2026-08-28",
    "missing_values": {
      "clicks": 0,
      "impressions": 0,
      "spend": 0
    },
    "observed_date_count": 28,
    "observed_dates_continuous": true,
    "period": {
      "end": "2026-08-28",
      "start": "2026-08-01"
    },
    "platform": "meta",
    "reporting_time_basis": "unknown",
    "requested_period": {
      "end": "2026-08-28",
      "start": "2026-08-01"
    },
    "row_count": 84,
    "selection": "file_snapshot",
    "sheet": null,
    "timezone": "America/Los_Angeles",
    "unobserved_dates_in_period": 0
  }
}
```