The mood series has been local-day-keyed since v1.32.12, but the metric
partners it joins against (blood pressure, weight, resting pulse) were
still keyed on the UTC calendar day. The join is an exact day-string
match, so for anyone outside UTC an evening reading landed on the next
UTC day and paired with the wrong mood entry — a one-day misalignment
sold as a same-day correlation.
Derive the three mood pairing partners as exact local-day means, keyed in
the user's own timezone via userDayKey (Intl-based, DST-safe). Blood
pressure and resting pulse reuse raw rows already on the request path;
weight rides one additive column on the existing raw-rows query. The
UTC-consistent weight x BP and BP-medication joins are left untouched —
both their sides share one UTC key space and they migrate with the
rollup tier later.
Marc-André Bombeck
1a08083436