Abstract base class for device sync services (device_sync_base.py):
- Standard OAuth token management with automatic refresh
- Credential decryption from integration_configs table
- Activity import pipeline with deduplication by external_id
- Webhook validation and handling interface
- get_valid_token(), get_credentials(), import_activity() helpers
Garmin, WHOOP, and Oura sync service implementations follow when
API credentials are obtained (Scot action items):
- Apply for Garmin Developer Program (DiligenceWorks Pte. Ltd.)
- Register WHOOP developer app at developer.whoop.com
- Register Oura app at cloud.ouraring.com
