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Marc-André Bombeck
57d9cc1674
Apple Watch has no electrodermal sensor, so there is no direct stress measurement to read — what HealthKit does give is discrete SDNN samples through the day. Derive an honest HRV-through-day PROXY: a suppressed, below-baseline intra-day SDNN is a recognised marker of higher sympathetic load. The provenance and label say "HRV-derived proxy" and never imply a galvanic/EDA reading. The engine reuses the shared vitals-baseline math (the same SDNN baseline the wellness index reads), maps the day's below-baseline suppression to a 0-100 score, and stores it as a COMPUTED STRESS_SCORE row — server-owned, a client can never POST it. It gates and writes nothing below the minimum intra-day sample floor or without a usable baseline. Standard: Kim et al. 2018 (HRV and stress meta-analysis); Thayer et al. 2012 (neurovisceral integration). Idempotent per user per day via the nightly job.