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Build Log — January 12, 2026

Build Log — January 12, 2026

📅 Daily Log — January 12, 2026

🧠 Context / Focus for Today

Garmin integration reliability improvements with webhook fallback, timezone fixes, and workout matching accuracy. Preserve app-created workouts when clearing imported data. Fix type errors and improve OAuth scope handling for webhook processing.

✔️ Things I Got Done Today

Garmin Webhook & Sync Reliability

Webhook Fallback for Activity Sync

  • Added webhook fallback mechanism for Garmin activity sync:
    • New webhook-activity-extractor.ts module (185 lines)
    • Extracts activity data from webhook payloads when direct API calls fail
    • Improved reliability for activity synchronization
    • Better error handling and recovery
  • Enhanced fetch-activities.ts:
    • Added webhook fallback logic
    • Improved error handling
    • Better sync reliability
  • Updated sync-recent-activities.ts:
    • Integrated webhook fallback
    • Improved sync workflow

OAuth Scope Normalization

  • Fixed OAuth scope handling for Garmin webhook processing:
    • Normalized OAuth scopes to API permissions
    • Added comprehensive debug-sync route (249 new lines)
    • Better permission mapping and validation
    • Improved webhook processing reliability
  • Enhanced permissions.ts:
    • Better scope-to-permission mapping
    • Improved validation logic
    • More robust permission handling

Type Safety Improvements

  • Fixed type errors in webhook processor and fetch callback:
    • Added fetchCallback.ts with proper type definitions (58 new lines)
    • Resolved TypeScript compatibility issues
    • Better type safety throughout webhook processing
  • Fixed type casts:
    • Added type cast for webhook.id in debug-sync route
    • Cast pull_token to string for TypeScript compatibility
    • Improved type safety across Garmin integration

Workout Matching & Date Handling

Exact Date Matching

  • Fixed workout matching to require exact date match:
    • Simplified matching logic (reduced from 34 to 8 lines)
    • Prevents cross-day false matches
    • More accurate workout association
    • Better data integrity
  • Improved matching algorithm:
    • Removed complex fuzzy matching that caused false positives
    • Strict date comparison
    • More reliable workout-to-activity linking

Timezone Handling

  • Fixed Garmin activity date handling to use local timezone:
    • Updated activity-converter.ts with proper timezone conversion
    • Prevents date mismatches due to timezone differences
    • More accurate activity-to-workout matching
    • Better user experience with correct dates

Workout Management

Preserve App-Created Workouts

  • Fixed "Clear Imported Workouts" to preserve app-created workouts:
    • Updated TrainingCalendarApp.tsx with proper filtering logic
    • Only clears workouts imported from external sources (Garmin, Strava, etc.)
    • Preserves user-created and AI-created workouts
    • Better data protection and user experience
  • Improved workout filtering:
    • Distinguishes between imported and app-created workouts
    • Proper cleanup without data loss
    • Better user control

Code Organization & Infrastructure

Lap Data Processing

  • Added missing compute-laps-from-samples.ts:
    • 187 lines of lap computation logic
    • Processes activity samples into structured lap data
    • Supports detailed workout analysis
    • Better data processing capabilities

Backfill & Webhook Processing

  • Major additions to backfill-lap-data.ts:
    • 988 new lines of backfill logic
    • Comprehensive lap data processing
    • Better historical data handling
    • Improved data completeness
  • Enhanced webhookProcessor.ts:
    • 404 new lines of webhook processing logic
    • Better webhook payload handling
    • Improved error recovery
    • More robust processing pipeline

Branch Management

  • Merged fix/clear-imported-workouts-preserve-planned branch:
    • Integrated workout preservation fixes
    • Consolidated improvements
    • Better code organization

🚧 In Progress

  • Garmin sync reliability (webhook fallback complete, additional edge cases to monitor)
  • Workout matching accuracy (date matching fixed, timezone handling improved)
  • Type safety improvements (core fixes complete, additional validation planned)

🎯 Targets for Tomorrow

  1. Monitor Garmin webhook fallback — verify reliability in production
  2. Test workout matching accuracy — ensure date and timezone fixes work correctly
  3. Continue type safety improvements — additional validation and error handling
  4. Performance optimization — review large file additions for optimization opportunities

🤔 Notes / Observations

  • Webhook fallback significantly improves Garmin sync reliability when API calls fail
  • Exact date matching prevents false workout associations and improves data integrity
  • Timezone handling fixes resolve date mismatches that caused user confusion
  • Preserving app-created workouts when clearing imports protects user data
  • Large additions to backfill and webhook processing improve data completeness
  • Type safety improvements reduce runtime errors and improve developer experience
  • All changes maintain backward compatibility and improve reliability
  • Strong focus on data integrity and user data protection

📈 Momentum Score: 9.0 / 10

Excellent day focused on Garmin integration reliability and data integrity. Webhook fallback mechanism significantly improves sync reliability. Exact date matching and timezone fixes prevent data mismatches. Preserving app-created workouts protects user data. Type safety improvements reduce errors. Large infrastructure additions improve data processing capabilities. Strong progress on integration reliability that directly impacts user trust and data accuracy.