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Marc-André Bombeck
03925ddece
Add a 7d / 30d / 90d / 1y segmented control to every HealthKit metric page, between the stat strip and the chart, with a sentiment-coloured "vs prior period" delta caption beside it. New route GET /api/analytics/range?type=<MeasurementType>&range=<7d|30d|90d|1y> returns the current-window aggregate, the previous comparable window, and the composed delta. Single metric type by construction, so the read is one rollup-tier call covering the trailing 2N days sliced into the two halves — no per-type fan-out, no Prisma-pool burst. Reuses the WMY readers (readBestGranularityRollups + aggregateWmyBuckets) and the two-window pattern the year-ago baseline already uses; count/min/max/mean/sum compose across buckets, SD/slope/r2 stay out (not composable). The cached summaries slice is untouched so the hottest dashboard cache key never fragments. The delta caption reuses the dashboard's metric-aware up-good/up-bad colour logic — extracted from trend-card into a shared trend-sentiment module — with the metric's good direction sourced from the metric-status registry (target-band metrics render neutral, matching deviation framing). When the prior window has no data the caption shows "no prior-period data" rather than a misleading 0%. The range choice persists across metrics via a localStorage seam and defaults to 30d so nothing regresses. Cache keyed per (type, range) through the query-key factory. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> (cherry picked from commit eac87a9f8b144f4d8e7a8b950528a19d5dcf8726)