feat(backend): add optional raw payload storage for incoming data (#589)

[bartmichalak]

Description

• Adds raw_payload_storage service for optional logging of raw incoming payloads (webhooks, SDK, API responses)
• Configured via RAW_PAYLOAD_STORAGE env var (disabled by default, log to enable)
• Hooked into Garmin /push webhook as first integration point

Checklist

General

• My code follows the project's code style
• I have performed a self-review of my code
• I have added tests that prove my fix/feature works (if applicable)
• New and existing tests pass locally

Backend Changes

You have to be in backend directory to make it work:

• uv run pre-commit run --all-files passes

Frontend Changes

• pnpm run lint passes
• pnpm run format:check passes
• pnpm run build succeeds

Testing Instructions

Steps to test:
1.
2.
3.

Expected behavior:

Screenshots

Additional Notes

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/raw-payload-storage

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[railway-app]

🚅 Deployed to the open-wearables-pr-591 environment in Open Wearables

Service	Status	Web	Updated (UTC)
backend	✅ Success (View Logs)	Web	Mar 11, 2026 at 12:41 am
celery-beat	✅ Success (View Logs)		Mar 11, 2026 at 12:41 am
frontend	✅ Success (View Logs)	Web	Mar 10, 2026 at 11:59 pm
celery-worker	✅ Success (View Logs)		Mar 10, 2026 at 11:59 pm
celery-flower	✅ Success (View Logs)	Web	Mar 10, 2026 at 11:59 pm