AU-012: Post backfill data to backend with is_backfill: true

Track: 1 — MVP
Section: 1.24 Historical Backfill
Status: [ ] Todo
Repo: app-user
Branch: feature/AU-012-backfill-to-backend

Done When

All historical data sent to POST /devices/{id}/sync with is_backfill: true. Backend won't send false alerts for old data

Notes

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