The old streak was non-functional: streaks.current_days was always 0 (never
computed/incremented), and the profile page read me.streak (0) + account
created_at as the "since" date — showing "0 days protected since <signup>"
for everyone. This is the DiGA key metric, so it had to be rebuilt.
New model: optimistic protection-coverage based on actual VPN/MDM protection
state, never resets to 0.
- backend: append-only protection_state_log + migration; POST /api/protection/event
(ingestion, deduped) + GET /api/protection/coverage (read-time compute, no cron);
server-side cooldown_disable event on cooldown resolve. Generous >6h-off/day rule.
- frontend: report protection on/off transitions (initial + flips, deduped) from
useProtectionState; rewrote profile StreakSection → half-donut (protected vs
unprotected) + progress bar (current streak → personal record) + empty state.
- coverage starts fresh from deploy (no historical backfill — clean data for DiGA).
- spec: docs/specs/protection-coverage-streak.md (shared contract).
- old streaks/streak_events/profiles.streak left intact (coach/scores consumers).
Also adds go-to-market one-pagers under docs/marketing/.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
