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FitTrack2/FitnessSync/specs/002-fitbit-garmin-sync/plan.md

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# Implementation Plan: Fitbit/Garmin Data Sync
**Branch**: `002-fitbit-garmin-sync` | **Date**: 2025-12-24 | **Spec**: [link](./spec.md)
**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)
```text
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.
```text
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.*