[Epikaigle]

Summary

Adds optional cross-device listening history synchronization via Google Drive appDataFolder for the Android app, matching the protocol implemented in the companion browser extension (#20).

This allows listening activity from Android and paired browser extensions to sync seamlessly over Google Drive without any external Tempo servers.

What Changed

• Google Drive transport: AppData background sync client using least-privilege drive.appdata scope.
• Database schema (Room v58):
  • Added migrations 55->56->57->58.
  • Added listening_event_origins table to track exact producer aliases per Google account.
  • Added drive_account_subject column to listening_events to isolate history by Google account.
• Background synchronization: Periodic DriveHistorySyncWorker (runs every ~6 hours and on-demand).
• Settings UI: Dedicated DriveHistorySyncSection in Backup & Restore settings with separate toggle, status, manual sync, and cloud history deletion controls.
• Provenance safety: Preserves stable origin IDs for LAN scrobble ingestion to eliminate publication loops.
• Unit & platform tests: Comprehensive tests for protocol encoding, Room migrations, cursors, account isolation, and reconciliation.

[avinaxhroy]

Thanks for all your contributions to Tempo, @Epikaigle ! I really appreciate the time and effort you’ve put into the project.

I’m going to close this PR, as I plan to build multi-device and cloud sync myself as part of Tempo’s roadmap, potentially as an optional paid add-on separate from the free core. Read our CONTRIBUTION.md.

We can talk on this topic and any topic regarding tempo if you want, my Discord- mrstevenofc

[Epikaigle]

Thanks for your reply @avinaxhroy !

The main reason I implemented Google Drive sync is that my computer is connected via Ethernet, while my phone uses 4G. I don't use Wi-Fi at home, so my browser extension and Android app are never on the same local network, which makes the existing LAN synchronization unusable for me.

That's why I was looking for a way to sync my listening history across devices without relying on a local network.

Since you're planning to develop multi-device/cloud sync yourself, I was wondering if you already have an estimated timeline for its release. Is this something you're planning to introduce soon, or is it more of a long-term feature?

Thanks again!