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Session Notes - Rolling Development Log

Session 2025-06-21 (Current)

Context: Working on Task #5A - Time-series data field corrections

Recent Accomplishments

  1. Documentation Optimization:

    • Updated README.md with current features (15+ endpoints, error handling, retry logic)
    • Added Reference Files section to CLAUDE.md (openapi_spec.json, etc.)
    • Optimized ARCHITECTURE.md and PROJECT_STATE.md (removed resolved issues)

  2. Time-Series Data Analysis:

    • Verified OpenAPI spec structure: SampleModel {interval: number, items: array, timestamp: string}
    • Identified incorrectly assumed time-series fields that should remain Optional[str]
    • Confirmed actual time-series fields: met, heart_rate, hrv, motion_count in various models

  3. Process Improvements:

    • Implemented meta-documentation approach: iterate and optimize rather than accumulate
    • Established reference file documentation pattern

Key Learning

Meta-Documentation Principle: Documentation files should be living documents that evolve - remove resolved issues, keep architectural decisions, optimize for current state.

Current Status

  • MAJOR DISCOVERY: Comprehensive API audit revealed systemic issues beyond Task #5A
  • Critical Issues Found:
    1. Heart Rate endpoint: Uses start_date/end_date but spec requires start_datetime/end_datetime
    2. VO2 Max URL: /vo2_max vs spec's /vO2_max
    3. Inconsistent API patterns: Old vs new implementations mixed
    4. Undocumented Union[str, date] type used across 20+ files
    5. Missing field hypnogram_5_min doesn't exist in OpenAPI spec
  • TimeSeriesData: Fixed timestamp→int, interval→int, added conversion logic
  • Next Priority: Complete systematic audit and fix all spec mismatches

Previous Sessions (Summary)

  • Task 1-3: Foundation work, data model standardization
  • Error Handling: 2+ months of development, comprehensive retry system
  • API Discovery: Real-world testing revealed model discrepancies

Next Session Startup Template

  1. Read PROJECT_STATE.md for current branch/task status
  2. Check ARCHITECTURE.md for technical context
  3. Review recent SESSION_NOTES for immediate context
  4. Avoid "where were we?" token waste