T4-034: Streak system — daily login + challenge participation streaks

Track: 4 — Telegram Mini App
Section: Phase D: Viral Growth Mechanics (32h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-034-streak-system
Estimated Hours: 3h

Done When

Track daily streaks. 7-day streak = bonus reward. 30-day streak = bigger bonus. Streak broken = start over

Notes

No notes yet.