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Daily-aggregate KPIs for the window plus an equal-length **previous** window for comparison. **Success `data`:** `preset`, `window`, `previousWindow`, `current`, `previous` (rollup rows). **Example `data` (shape):** ```json { "preset": "30d", "window": { "startDate": "2026-01-01", "endDate": "2026-01-30" }, "previousWindow": { "startDate": "2025-12-02", "endDate": "2025-12-31" }, "current": { "request_count": "...", "cost_sum": "..." }, "previous": { "request_count": "...", "cost_sum": "..." } } ```