Implementation Plan: Fitbit/Garmin Data Sync

Branch: 002-fitbit-garmin-sync | Date: 2025-12-24 | Spec: link Input: Feature specification from specs/002-fitbit-garmin-sync/spec.md

Summary

This feature will implement synchronization of activities and health metrics from Garmin Connect to the application's database. The implementation will involve wiring up existing backend stub endpoints to a sync service that uses the garth library to fetch data from Garmin. The synced data will be stored in a PostgreSQL database and exposed through a series of new API endpoints for querying and retrieval.

Technical Context

Language/Version: Python 3.11 Primary Dependencies: FastAPI, Uvicorn, SQLAlchemy, Pydantic, garth Storage: PostgreSQL Testing: pytest, pytest-asyncio Target Platform: Linux server (via Docker) Project Type: Web application (backend) Performance Goals: Standard web application performance, with API responses under 500ms p95. Constraints: The solution should be implemented within the existing backend service. Scale/Scope: The initial implementation will support syncing data for a single user.

Constitution Check

GATE: Must pass before Phase 0 research. Re-check after Phase 1 design.

Test-First: The implementation will follow a test-driven approach. For each endpoint and service function, a corresponding set of unit and/or integration tests will be written before the implementation.

VERDICT: The plan adheres to the core principles of the constitution.

Project Structure

Documentation (this feature)

specs/002-fitbit-garmin-sync/
├── plan.md              # This file
├── research.md          # Phase 0 output
├── data-model.md        # Phase 1 output
├── quickstart.md        # Phase 1 output
├── contracts/           # Phase 1 output
│   └── api-contract.yaml
└── tasks.md             # Phase 2 output (created by /speckit.tasks)

Source Code (repository root)

The implementation will be contained within the existing backend directory structure.

backend/
├── src/
│   ├── api/
│   │   ├── activities.py
│   │   ├── metrics.py
│   │   └── sync.py
│   ├── models/
│   │   ├── activity.py
│   │   └── health_metric.py
│   └── services/
│       ├── sync_app.py
│       └── garmin/
│           └── client.py
└── tests/
    ├── integration/
    │   ├── test_sync_flow.py
    └── unit/
        ├── test_api/
        │   ├── test_activities.py
        │   └── test_metrics.py
        └── test_services/
            └── test_sync_app.py

Structure Decision: The plan adheres to the existing project structure, which is a single backend service. New functionality will be added to the appropriate existing modules.

Complexity Tracking

No constitutional violations to justify.

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