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feat(api): add trend analysis and extended periods to dashboard summary
- Add `include_trends` query parameter to enable trend calculation - Implement trend comparison logic (delta % and direction) against previous periods - Add support for `last7d`, `last30d`, and `all` time period options - Update `DashboardSummaryResponse` to include optional `trends` field - Add helper functions for custom time window aggregation - Add unit tests for trend calculation and period window logic - Update feature documentation with new parameters and response schemas
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@@ -72,15 +72,39 @@
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| 参数 | 类型 | 说明 |
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|------|------|------|
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| `period` | string | 预设周期: `today`, `week`, `month` |
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| `period` | string | 预设周期: `today`, `week`, `month`, `last7d`, `last30d`, `all` |
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| `since` | int | 自定义起始时间 (Unix 秒) |
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| `until` | int | 自定义结束时间 (Unix 秒) |
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| `include_trends` | bool | 是否包含趋势数据 (与前一周期对比) |
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> **已知限制** (待 fix-dashboard-summary-api 实现后解决):
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> - `period=week` 使用自然周起点 (周一),非滚动 7 天
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> - `period=month` 使用自然月起点 (1号),非滚动 30 天
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> - 趋势数据 (delta/trend) 当前不返回,前端需隐藏趋势指示器
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> - 建议使用 `since`/`until` 实现精确的滚动时间窗口
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**周期类型说明**:
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| 周期值 | 时间窗口 | 趋势对比周期 |
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|--------|----------|--------------|
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| `today` | 今日 00:00 UTC → 当前 | 昨日 |
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| `week` | 本周一 00:00 UTC → 当前 | 上一自然周 |
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| `month` | 本月 1 日 00:00 UTC → 当前 | 上一自然月 |
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| `last7d` | 当前 - 7 天 → 当前 | 14 天前 → 7 天前 |
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| `last30d` | 当前 - 30 天 → 当前 | 60 天前 → 30 天前 |
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| `all` | 无时间过滤 | 不支持趋势 |
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**趋势数据** (当 `include_trends=true` 时返回):
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```json
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{
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"trends": {
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"requests": { "delta": 12.5, "direction": "up" },
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"tokens": { "delta": -1.1, "direction": "down" },
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"error_rate": { "delta": 0.0, "direction": "stable" },
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"latency": { "delta": -5.2, "direction": "down" }
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}
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}
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```
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| 字段 | 说明 |
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|------|------|
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| `delta` | 与前一周期相比的百分比变化 (四舍五入到 1 位小数) |
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| `direction` | `up` (增长 >0.5%), `down` (下降 <-0.5%), `stable`, `new` (无基准数据) |
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### 3.4 告警摘要
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