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Build Log – 2026-01-05

Build Log – 2026-01-05

📅 Daily Log — January 5, 2026

🧠 Context / Focus for Today

Expand AI Coach to multi-sport support (cycling and swimming). Build Health Metrics Dashboard with Garmin data visualization. Add workout normalization and deduplication. Improve Garmin sync status UI. Enhance planning board with task archiving.

✔️ Things I Got Done Today

Multi-Sport AI Coach Support

Cycling Support

  • Added FTP-based power zones (Z1-Z6: Active Recovery to Anaerobic):
    • Z1: Active Recovery (50-60% FTP)
    • Z2: Endurance (60-75% FTP)
    • Z3: Tempo (75-90% FTP)
    • Z4: Threshold (90-105% FTP)
    • Z5: VO2max (105-120% FTP)
    • Z6: Anaerobic (120%+ FTP)
  • Created 5 cycling workout templates:
    • Sweet Spot 2x20min
    • VO2max 5x4min intervals
    • Threshold 3x10min intervals
    • Endurance 2hr ride
    • Recovery 45min ride
  • Added createPowerStep() helper for power-based workout steps
  • Updated AI Coach system prompt from "running coach" to "endurance coach"
  • Added cycling power zone reference (% FTP) to AI context
  • Added color suggestions for bike workouts (green)

Swimming Support

  • Added CSS-based pace zones:
    • Easy (slower than CSS + 10s/100m)
    • Aerobic (CSS + 5s to CSS + 10s/100m)
    • Threshold (CSS to CSS + 5s/100m)
    • VO2max (CSS - 5s to CSS/100m)
    • Sprint (faster than CSS - 5s/100m)
  • Created 5 swimming workout templates:
    • CSS Test (400m time trial)
    • Threshold 10x100m intervals
    • Speed 8x50m intervals
    • Endurance 2000m continuous
    • Drills & Technique session
  • Added createSwimStep() helper with stroke type support
  • Added swimming pace zone reference (CSS-based) to AI context
  • Added color suggestions for swim workouts (cyan)

AI Coach Enhancements

  • Added 9 gold examples: 4 cycling, 4 swimming, 1 triathlon week
  • Added sport detection in example selector (bike/swim/triathlon keywords)
  • Added intent context for cycling, swimming, and triathlon training
  • Updated example selector to handle multi-sport queries
  • Enhanced system prompt with multi-sport coaching capabilities

Health Metrics Dashboard

API Endpoint

  • Created /api/health/dashboard endpoint:
    • Fetches recovery status from Garmin Health API
    • Retrieves user metrics (VO2 Max, Fitness Age)
    • Gets 7-day history for trends
    • Includes daily activity data (steps, calories, resting HR)
    • Includes intensity minutes (moderate and vigorous)

HealthMetricsCard Component

  • Created comprehensive health metrics card:
    • Body Battery display with current level
    • Sleep Score with quality indicator
    • Stress Level with status
    • VO2 Max with fitness age
    • Training readiness recommendation
    • Daily Activity section:
      • Steps with goal progress bar
      • Active calories
      • Resting heart rate
    • Intensity Minutes section:
      • Moderate intensity minutes
      • Vigorous intensity minutes (counts 2x toward WHO goal)
      • Progress toward 150 min/week WHO goal
  • Integrated into main dashboard page (only shown when Garmin connected)
  • Uses existing slate minimal + ocean blue design system

Health Trends Page

  • Created dedicated /health page with 7-day charts:
    • Body Battery trends
    • Sleep Score trends
    • Stress Level trends
    • VO2 Max history
    • Resting HR trends
    • Steps trends
  • Interactive charts with hover tooltips
  • Clean, minimal design consistent with app aesthetic

Workout Normalization and Deduplication

Workout Normalizer Module

  • Created /lib/ai/workout-normalizer.ts (962 lines):
    • Normalize sport_type values (Run vs Running vs run)
    • Standardize duration formats (always store as seconds)
    • Normalize distance units (always store as meters)
    • Validate structured_data against Garmin-safe rules
    • Clean up title/description formatting
    • Add deduplication logic using date + sport + duration fuzzy matching
    • Handle edge cases and malformed data

Integration

  • Applied normalizer in AI Coach route before returning workouts
  • Log normalization changes for debugging
  • Prevent duplicate workouts from being suggested
  • Ensure consistent workout data structure

Garmin Sync Status UI

Sync Status API

  • Created /api/sync/status endpoint:
    • Fetches sync connection status
    • Returns last sync timestamp
    • Returns pending workout count
    • Returns sync errors if any

UI Indicators

  • Added "From Garmin" badge on WorkoutCard for imported activities
  • Added "Matched" badge showing when activity linked to planned workout
  • Added pending count badge in SyncMenu showing workouts not yet synced
  • Added last sync timestamp display in SyncMenu
  • Added sync error display in SyncMenu
  • Enhanced sync result toast with detailed breakdown (new/updated/matched)
  • Added spinning icon during sync operation
  • Closes the UI feedback loop for Garmin sync operations

PlanPreviewModal Component

  • Created comprehensive plan preview modal:
    • Week-by-week grouping with expand/collapse
    • Per-workout selection with conflict detection
    • Sport breakdown summary
    • Accept all/selected/discard actions
    • Visual conflict indicators
    • Detailed workout preview

Planning Board Improvements

Task Archiving

  • Added ability to archive completed tasks:
    • Archive individual done tasks via button
    • Archive all done tasks at once
    • Auto-archive done tasks older than 7 days on load
    • Collapsible archived section with restore option
  • Reduces clutter in active planning board
  • Preserves task history for reference

Local Board Storage

  • Enhanced lib/planning/localBoard.ts:
    • Added archive functionality
    • Added auto-archive logic
    • Added restore functionality
    • Improved task management

Unified Activity Format and Real-Time Garmin Download

Unified Activity Types

  • Created source-agnostic intermediate format (lib/activity/unified-activity-types.ts):
    • Unified sport types (run, bike, swim, strength, walk, hike, cardio, yoga, other)
    • Sport-specific metrics (RunningMetrics, CyclingMetrics, SwimmingMetrics)
    • Common activity fields (duration, distance, elevation, heart rate, calories)
    • Source metadata (source, sourceId, sourceUrl)
    • Enables cross-source deduplication and consistent processing

Activity Converters

  • Created Garmin → unified converter (lib/activity/garmin-to-unified.ts):
    • Converts Garmin activity notifications to unified format
    • Handles all sport types and metrics
    • Preserves source metadata
  • Created Strava → unified converter (lib/activity/strava-to-unified.ts):
    • Converts Strava activity summaries to unified format
    • Maps Strava-specific fields to unified format
    • Handles Strava sport types
  • Created unified → workout converter (lib/activity/unified-to-workout.ts):
    • Converts unified activities to workout format
    • Handles all sport types and structured data
    • Preserves activity metadata

Real-Time Garmin Download

  • Created lib/garmin/fetch-activity-by-id.ts:
    • Fetches full activity details from Garmin API by ID
    • Uses narrow time window query around activity start time
    • Efficiently locates specific activity (2-hour window)
    • Handles retries and error cases
  • Enhanced webhook processor (lib/garmin/webhookProcessor.ts):
    • Auto-fetches full activity when webhook has partial data
    • Cross-source deduplication (skips if same activity exists from different source)
    • Real-time activity download when Garmin sends webhook notifications
    • Improved fingerprinting with createFingerprintFromUnifiedActivity

Activity Fingerprinting

  • Enhanced lib/activity-fingerprint.ts:
    • Added createFingerprintFromUnifiedActivity for consistent fingerprinting
    • Works with unified activity format
    • Enables cross-source deduplication

Benefits

  • Real-time activity download when Garmin sends webhook notifications
  • Foundation for unified cross-platform activity handling
  • Prevents duplicate activities from multiple sources
  • Consistent processing regardless of source (Garmin, Strava, etc.)
  • Easy extension for future integrations

Business Operations

C Corp Incorporation

  • C Corp incorporation via Stripe Atlas for Flow State was approved
  • Company is now officially incorporated as a C Corporation
  • Follow-up to the filing completed on January 1st

Company Credit Card

  • Applied for company credit card
  • Enables proper expense tracking and separation of business/personal finances
  • Supports business operations and growth

Documentation

CLAUDE.md

  • Created comprehensive project reference for AI assistants:
    • Project overview and architecture
    • Key concepts and patterns
    • Code organization
    • Development workflow
    • Common tasks and examples

GitHub Actions

  • Added Claude Code GitHub Actions workflow:
    • Automated PR creation
    • Integration with Claude Code
    • Streamlined development workflow

🚧 In Progress

  • Multi-sport AI Coach expansion (cycling and swimming complete, triathlon in progress)
  • Health Metrics Dashboard (core features complete, additional metrics planned)
  • Workout normalization (core logic complete, edge cases being refined)
  • Garmin sync status UI (core features complete, additional feedback planned)
  • Unified activity format (core converters complete, additional sources planned)

🎯 Targets for Tomorrow

  1. Continue multi-sport expansion — add triathlon-specific templates and examples
  2. Enhance Health Dashboard — add more metrics and longer-term trends
  3. Refine workout normalization — handle more edge cases and improve deduplication
  4. Improve sync status UI — add more detailed sync history and error handling

🤔 Notes / Observations

  • Multi-sport support significantly expands AI Coach capabilities
  • Health Metrics Dashboard provides valuable insights from Garmin data
  • Workout normalization ensures data consistency and prevents duplicates
  • Sync status UI closes important feedback loop for users
  • Planning board archiving improves organization and reduces clutter
  • Unified activity format enables real-time downloads and cross-source deduplication
  • Real-time Garmin download improves user experience with instant activity sync
  • Cross-source deduplication prevents duplicate activities from multiple platforms
  • C Corp approval marks important milestone in company formation
  • Company credit card enables proper financial management and expense tracking
  • Documentation helps AI assistants understand project structure
  • All features maintain consistent design system and user experience

📈 Momentum Score: 9.5 / 10

Exceptional day with major feature expansions. Multi-sport AI Coach transforms the platform from running-only to comprehensive endurance training. Health Metrics Dashboard provides valuable insights. Workout normalization ensures data quality. Sync status UI improves user experience. Planning board enhancements improve organization. Strong progress across all areas. Platform is becoming a comprehensive endurance training solution.