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Marc-André BombeckandClaude Opus 4.7
6a64df0fad
Hitting "All" on a long-running account used to render thousands of
daily points — unreadable, and slow on mobile. The chart adapter now
picks an aggregation level based on the visible range:
- ≤ 90 days → daily (unchanged)
- 91-730 days → ISO weekly mean
- > 730 days → Berlin-calendar monthly mean
Empty buckets are dropped instead of zero-padding so a sparse user
keeps a real trend instead of a baseline floor. Each metric is
aggregated independently so blood-pressure SYS/DIA pairs stay in sync
without one channel pulling the other to 0 on missing days.
A small chip beside the chart title surfaces the active bucket
("Wochendurchschnitt" / "Monatsdurchschnitt" in DE, "Weekly avg" /
"Monthly avg" in EN) so the user always knows what they're looking at.
The bucketer (`src/lib/charts/bucket-time-series.ts`) is pure and
covered by 14 unit tests including ISO-week boundary handling, the
multi-metric independence guarantee, and the empty-bucket skip.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>