Love it! Not an iOS dev, but have built a personal app that I want to publish for macOS too. I built on top of SQLite, but didn’t want to tackle the synchronisation yet. That should solve it.

It employs a „last edit wins“ strategy for conflict resolution, which is fine in my case. Obviously could be too basic for collaborative apps.

You’d be surprised; it depends on the scope of the last write wins register. If you do it granularly attribute by attribute, last write wins is fine for mostly-online mostly-realtime collaborative apps. The exception is (rich) text where you really want CRDT/OT/similar intention preserving merges of concurrent edits.