Strava

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Build me a private training log over my own GPS files. Accept that the social half cannot be built.

STACK
- Astro with a Node adapter, SQLite via better-sqlite3
- Files as FIT, TCX or GPX, parsed on upload and kept as the source of truth

INGEST
- Watch exports dropped into a folder, or uploaded through the browser
- Parse to a normalised stream: time, latitude, longitude, elevation, heart rate, cadence, power
- Deduplicate on start time plus duration, because watches export the same activity twice

THE NUMBERS THAT ARE ACTUALLY HARD
- Elevation gain: smooth the barometric or SRTM elevation before summing, and state the threshold used — raw sums are nonsense
- Moving time: a speed threshold with hysteresis, not a simple cut-off
- Normalised power over a 30-second rolling average to the fourth power, if power exists

ANALYSIS
- Weekly volume, distance and elevation; a fitness and fatigue model from daily training load
- Personal bests over standard distances, computed by sliding window across every activity

MAPS
- Render the track as SVG over OpenStreetMap tiles; respect the tile usage policy or self-host tiles

PRIVACY
- A privacy zone around home: clip the first and last radius from every track before it is stored, not before it is displayed

WHAT IS NOT HERE
- Segments, leaderboards, kudos, clubs — the network, which is the product

Include a README on the elevation smoothing, the moving-time rule and the tile policy.