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Build Log – 2025-12-19

Build Log – 2025-12-19

📅 Daily Log — December 19, 2025

🧠 Context / Focus for Today

Build production-ready Garmin webhook infrastructure for real-time data sync, implement user permission management, and create structured storage for Garmin Health API data. Focus on meeting Garmin production API requirements for webhooks, permissions, and deregistration.

✔️ Things I Got Done Today

Garmin Integration / Webhooks

  • Implemented PING/PUSH webhook endpoints with comprehensive type system for all 15+ Garmin summary types (activities, dailies, sleeps, stress, userMetrics, bodyComps, pulseox, respiration, etc.).
  • Created async webhook processor with Promise.allSettled for fault-tolerant processing.
  • Implemented PING callback fetcher with retry logic and exponential backoff.
  • Added garmin_webhook_logs table for audit trail and debugging.
  • Upgraded webhook route with proper garmin-client-id validation.
  • Added support for handling deregistrations by clearing tokens for compliance.
  • Implemented dual user lookup supporting both garmin_connections and garmin_integrations tables.

User Management

  • Implemented Garmin user permissions endpoint (/api/garmin/permissions) with permission fetching utilities.
  • Added parallel fetching of user ID and permissions during OAuth callback.
  • Created database migration for permissions and garmin_user_id columns.
  • Updated webhook processor to check permissions before processing data.
  • Implemented Garmin user deregistration endpoint (DELETE /api/garmin/disconnect) with proper auth.
  • Added outbound deregistration support for when users disconnect Garmin from the app.
  • Created GarminDisconnectButton component for standalone use.
  • Updated GarminConnection component to use DELETE method.
  • Added migration for disconnected_at column and status constraint.
  • Implemented token refresh before calling Garmin API and token clearing (always, even if API fails).

Data Storage

  • Implemented Garmin Health API data storage with structured database tables.
  • Created 5 new tables: garmin_daily_summaries, garmin_epoch_summaries, garmin_sleep_summaries, garmin_stress_summaries, garmin_activity_summaries.
  • Implemented HealthDataProcessor service for idempotent upserts.
  • Added comprehensive TypeScript types for Garmin Health API.
  • Updated webhook processor to store data in structured tables.
  • Added RLS policies for all new tables with user isolation.
  • Added deny-all policy to garmin_webhook_logs for security.
  • All tables include raw_payload for debugging and summary_id for idempotent upserts.

Debugging / Fixes

  • Fixed import issue: changed isPingNotification from type import to value import.
  • Added type annotations to Supabase queries in deregistration module.

🚧 In Progress

  • Garmin production key application preparation.
  • Testing webhook endpoints with Garmin sandbox environment.
  • Performance optimization for Health API data processing.

🎯 Targets for Tomorrow

  1. Complete Training API V2 features (Priorities 10-12) — workout templates, creation endpoints, and training schedules.
  2. Finish Garmin integration roadmap (Priorities 2-5) — backfill on connection, training history matching, auto-sync infrastructure.
  3. Enhance AI integration with structured workout data generation.
  4. Create training plan templates and builder component.

🤔 Notes / Observations

  • Webhook infrastructure is critical for production — Garmin requires PUSH webhooks, not pull-only.
  • Permission checking is essential for production approval — must respect user-granted permissions (ACTIVITY_EXPORT, HEALTH_EXPORT, WORKOUT_IMPORT, etc.).
  • Deregistration endpoint is required for Garmin production API approval.
  • Health API data storage provides foundation for comprehensive fitness tracking beyond just activities.
  • Structured tables enable better querying and analytics compared to raw JSON storage.
  • Fault-tolerant webhook processing ensures reliability even when individual summary types fail.

📈 Momentum Score: 9.2 / 10

Exceptional progress on production-critical Garmin infrastructure. All major webhook, permission, and deregistration requirements completed. Foundation set for comprehensive Health API data tracking. Ready for Training API V2 implementation tomorrow.