Migrate away from NSPersistentCloudKitContainer

[skjiisa]

I've been having a lot of issues with NSPersistentCloudKitContainer lately and would like to move away from it. A solution like CloudCore or IceCream (which would require rewriting the database in Realm) could be a good option.

The issues I've been having

• NSPersistentCloudKitContainer doesn't sync in app extensions, requiring that crazy, manual solution that's currently in place for the widget.
• Inconsistent sync results between the manual extension solution and the NSPersistentCloudKitContainer solution.
  • Often I'll get records not syncing in the app when they do in the widget.

Overall it just doesn't seem very reliable. A different solution still needs to use CloudKit and not a third-party service like Realm's MongoDB sync as I want to keep the privacy policy empty. I don't want to be in charge of collecting any user data. With CloudKit, it's all handled by Apple and isn't my problem.

[skjiisa]

Going with CloudCore would likely be the simplest solution as I could keep the local databases and just sync them up with the new implementation. IceCream would require a database migration which would likely take a lot more work, especially because I've never used Realm before.