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Discussion on: I Built a Chrome Extension to Sync AI Studio System Instructions. Here's Why chrome.storage.sync Couldn't Do It

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Muhammad Ahsan Ayaz

Great question! Concurrent edits are handled with last-write-wins semantics based on updatedAt timestamps ... whichever device flushes to Drive last wins for that instruction.

The one edge case worth knowing: if two devices edit the same instruction simultaneously, the losing write is gone with no notification. For a personal single-user tool this is acceptable, but it's a known limitation documented in the repo.

Deletes are safer ... a tombstone (deletedAt timestamp) wins over a live item when deletedAt > updatedAt, so a delete on device A can't be silently resurrected by a stale live copy on device B.

Full conflict resolution UI (diff + user choice) would be the natural next step if this ever needed multi-user support.