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Build Log – 2025-12-11

Build Log – 2025-12-11

📅 Daily Log — December 11, 2025

🧠 Context / Focus for Today

Unblock the Garmin workout export pipeline, harden structured workout handling, and simplify planning tooling after recent complexity creep. Focus on correctness over features.

✔️ Things I Got Done Today

Flow State Codebase

  • Refactored and hardened the Garmin Training API export pipeline.
  • Introduced a canonical builder:
    • buildGarminTrainingApiWorkout()
    • Ensures a single source of truth for Garmin payload construction.
  • Split structured vs legacy workout handling into clear paths.
  • Added strong TypeScript typing for Garmin workout payloads and steps.
  • Updated the Garmin export API route to use the canonical builder directly.
  • Removed deprecated workout payload logic.

Testing

  • Added automated tests for:
    • Structured threshold workouts
    • Legacy workout fallback handling
    • Error cases in workout building
  • Verified step counts and structure against decoded FIT examples.

Garmin Debugging

  • Confirmed that mixed distance/time steps can silently break Garmin workouts.
  • Identified Garmin-safe constraints:
    • One duration mode per workout (time or distance)
    • Especially important inside REPEAT blocks
  • Verified that workouts upload correctly when sent directly from Flow State to Garmin.

Architecture / Planning

  • Determined next steps for grouping repeats so workouts display cleanly on Garmin watches.
  • Decided grouping repeats is a "nice to have" and not a blocker.
  • Prepared a full Cursor refactor prompt to lock in the Garmin export pipeline.

Planning Board

  • Continued simplifying the Kanban board after recent overengineering.
  • Reaffirmed that fewer features = higher velocity right now.

🚧 In Progress

  • Garmin-safe workout duration mode enforcement.
  • FIT file export (parallel path to Training API).
  • Planning board simplification and cleanup.
  • Workout builder UI constraints (pace editing, duration consistency).

🎯 Targets for Tomorrow

  1. Lock in Garmin-safe workout rules at the data model level.
  2. Start FIT export implementation using validated examples.
  3. Continue simplifying planner features that don't directly improve execution.
  4. Add payload preview logging for Garmin exports.

🤔 Notes / Observations

  • Garmin is extremely strict but predictable once constraints are respected.
  • Centralizing the workout builder dramatically reduces future bugs.
  • The project moves faster when features are cut, not added.

📈 Momentum Score: 8.8 / 10

High-leverage day. Major architectural risk reduced.