# Body track

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## Body track backend rules

- Database commandments
    1. All measurement values are in metric units
      - weight = kg
      - height = cm
      - calories = kcal
    2. All time values are in UTC
    3. All ip related values need to support both ipv4 and ipv6
    4. Email addresses are unique per user

- HTTP APIs specs
  - Authentication
    - JWTs:
      - 14 day maximum lease time
      - claims (userid)
    - OAuth2: scopes (email, profile, stats, workouts)
  - REST based design
  - Allow export via CSV all personal data
  - Allow deleting account data
  - 80ms 95th percentile max response time for all calls

- Frontend specs
  - Support Chrome, Firefox, Safari
  - Support mobile and desktop sizes
  - All pages should be bookmarkable, including queries for charts and search
  - Performance
    - 2 seconds 95th pct for TTI
    - Full page size must be under 500kb (including API calls)