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Tasks: Fitbit/Garmin Data Sync

Input: Design documents from specs/002-fitbit-garmin-sync/ Prerequisites: plan.md (required), spec.md (required for user stories), research.md, data-model.md, contracts/

Tests: Tests are included based on the TDD principle mentioned in the constitution.

Organization: Tasks are grouped by user story to enable independent implementation and testing of each story.

Format: [ID] [P?] [Story] Description

  • [P]: Can run in parallel (different files, no dependencies)
  • [Story]: Which user story this task belongs to (e.g., US1, US2, US3)
  • Include exact file paths in descriptions

Path Conventions

  • Paths shown below assume single project - adjust based on plan.md structure

Phase 1: Setup (Shared Infrastructure)

Purpose: Project initialization and basic structure

  • T001 Review sync_app.py in backend/src/services/sync_app.py
  • T002 Review garmin/client.py in backend/src/services/garmin/client.py

Phase 2: Foundational (Blocking Prerequisites)

Purpose: Core infrastructure that MUST be complete before ANY user story can be implemented

⚠️ CRITICAL: No user story work can begin until this phase is complete

  • T003 Add error handling to all endpoints in backend/src/api/
  • T004 Add logging at key points in backend/src/api/ and backend/src/services/
  • T005 Add missing imports for API Token, SyncApp, GarminClient, setup_logger to backend/src/api/sync.py
  • T006 Add missing imports for Response, Activity to backend/src/api/activities.py
  • T007 Add missing imports for func, HealthMetric to backend/src/api/metrics.py

Checkpoint: Foundation ready - user story implementation can now begin in parallel


Phase 3: User Story 1 - Sync Activities from Garmin (Priority: P1) 🎯 MVP

Goal: Users can trigger a synchronization of their recent activities from their Garmin account so that their fitness data is stored and available within the application.

Independent Test: Trigger a sync and verify recent activities appear in the activity list. Also, verify error message when Garmin account is not connected.

Tests for User Story 1

  • T008 [US1] Write unit tests for POST /api/sync/activities endpoint in backend/tests/unit/test_api/test_sync.py
  • T009 [US1] Write integration tests for activity sync flow in backend/tests/integration/test_sync_flow.py

Implementation for User Story 1

  • T010 [US1] Implement activity sync logic in backend/src/api/sync.py (replace mock response with actual sync logic)
  • T011 [US1] Implement sync_activities method in backend/src/services/sync_app.py to use GarminClient

Checkpoint: At this point, User Story 1 should be fully functional and testable independently


Phase 4: User Story 3 - Sync Health Metrics from Garmin (Priority: P1)

Goal: Users can trigger a synchronization of their daily health metrics (like steps and HRV) from their Garmin account to track their wellness over time.

Independent Test: Trigger a metric sync and see updated data in their health dashboard or metric query views.

Tests for User Story 3

  • T012 [US3] Write unit tests for POST /api/sync/metrics endpoint in backend/tests/unit/test_api/test_sync.py
  • T013 [US3] Write integration tests for health metrics sync flow in backend/tests/integration/test_sync_flow.py

Implementation for User Story 3

  • T014 [US3] Create POST /api/sync/metrics endpoint in backend/src/api/sync.py
  • T015 [US3] Implement sync_health_metrics method in backend/src/services/sync_app.py to use garth library

Checkpoint: At this point, User Stories 1 AND 3 should both work independently


Phase 5: User Story 2 - View and Query Activities (Priority: P2)

Goal: Users can list their synced activities, filter them by criteria like activity type and date, and download the original activity file for their records.

Independent Test: Navigate to the activity list, apply filters, and attempt to download a file.

Tests for User Story 2

  • T016 [US2] Write unit tests for GET /api/activities/list endpoint in backend/tests/unit/test_api/test_activities.py
  • T017 [US2] Write unit tests for GET /api/activities/query endpoint in backend/tests/unit/test_api/test_activities.py
  • T018 [US2] Write unit tests for GET /api/activities/download/{activity_id} endpoint in backend/tests/unit/test_api/test_activities.py

Implementation for User Story 2

  • T019 [US2] Implement list_activities endpoint logic in backend/src/api/activities.py
  • T020 [US2] Implement query_activities endpoint logic in backend/src/api/activities.py
  • T021 [US2] Implement download_activity endpoint logic in backend/src/api/activities.py

Checkpoint: At this point, User Stories 1, 3 and 2 should all work independently


Phase 6: User Story 4 - View and Query Health Metrics (Priority: P2)

Goal: Users can see a list of all the metric types they've synced, query their data for specific time ranges, and view a high-level summary.

Independent Test: Navigate to the metrics section, select a metric type and date range, and view the resulting data and summary.

Tests for User Story 4

  • T022 [US4] Write unit tests for GET /api/metrics/list endpoint in backend/tests/unit/test_api/test_metrics.py
  • T023 [US4] Write unit tests for GET /api/metrics/query endpoint in backend/tests/unit/test_api/test_metrics.py
  • T024 [US4] Write unit tests for GET /api/health-data/summary endpoint in backend/tests/unit/test_api/test_metrics.py

Implementation for User Story 4

  • T025 [US4] Implement list_available_metrics endpoint logic in backend/src/api/metrics.py
  • T026 [US4] Implement query_metrics endpoint logic in backend/src/api/metrics.py
  • T027 [US4] Implement get_health_summary endpoint logic in backend/src/api/metrics.py

Checkpoint: All user stories should now be independently functional


Phase 7: Polish & Cross-Cutting Concerns

Purpose: Improvements that affect multiple user stories

  • T028 Review error handling across all new endpoints in backend/src/api/
  • T029 Review logging implementation across backend/src/api/ and backend/src/services/
  • T030 Add/update documentation for new API endpoints (e.g., OpenAPI spec, inline comments) in specs/002-fitbit-garmin-sync/contracts/api-contract.yaml and relevant Python files.
  • T031 Run quickstart.md validation as described in specs/002-fitbit-garmin-sync/quickstart.md

Dependencies & Execution Order

Phase Dependencies

  • Setup (Phase 1): No dependencies - can start immediately
  • Foundational (Phase 2): Depends on Setup completion - BLOCKS all user stories
  • User Stories (Phase 3+): All depend on Foundational phase completion
    • User stories can then proceed in parallel (if staffed)
    • Or sequentially in priority order (P1 → P1 → P2 → P2)
  • Polish (Final Phase): Depends on all desired user stories being complete

User Story Dependencies

  • User Story 1 (P1): Can start after Foundational (Phase 2) - No dependencies on other stories
  • User Story 3 (P1): Can start after Foundational (Phase 2) - No dependencies on other stories
  • User Story 2 (P2): Can start after Foundational (Phase 2) - May integrate with US1 but should be independently testable
  • User Story 4 (P2): Can start after Foundational (Phase 2) - May integrate with US1/US3/US2 but should be independently testable

Within Each User Story

  • Tests MUST be written and FAIL before implementation
  • Models before services (where applicable)
  • Services before endpoints (where applicable)
  • Core implementation before integration
  • Story complete before moving to next priority

Parallel Opportunities

  • All Setup tasks can run in parallel.
  • All Foundational tasks can run in parallel (within Phase 2).
  • Once Foundational phase completes, user stories can start in parallel by different team members.
  • Tests for a user story can run in parallel.
  • Implementation tasks within a user story can be identified for parallel execution where there are no dependencies.

Implementation Strategy

MVP First (User Stories 1 & 3)

  1. Complete Phase 1: Setup
  2. Complete Phase 2: Foundational (CRITICAL - blocks all stories)
  3. Complete Phase 3: User Story 1
  4. Complete Phase 4: User Story 3
  5. STOP and VALIDATE: Test User Stories 1 and 3 independently.
  6. Deploy/demo if ready

Incremental Delivery

  1. Complete Setup + Foundational → Foundation ready
  2. Add User Story 1 → Test independently → Deploy/Demo (MVP!)
  3. Add User Story 3 → Test independently → Deploy/Demo
  4. Add User Story 2 → Test independently → Deploy/Demo
  5. Add User Story 4 → Test independently → Deploy/Demo
  6. Each story adds value without breaking previous stories

Parallel Team Strategy

With multiple developers:

  1. Team completes Setup + Foundational together
  2. Once Foundational is done:
    • Developer A: User Story 1
    • Developer B: User Story 3
    • Developer C: User Story 2
    • Developer D: User Story 4
  3. Stories complete and integrate independently

Notes

  • Tasks with file paths indicate specific files to be created or modified.
  • Each user story should be independently completable and testable.
  • Verify tests fail before implementing.
  • Commit after each task or logical group.
  • Stop at any checkpoint to validate story independently.
  • Avoid: vague tasks, same file conflicts, cross-story dependencies that break independence