How can one observe changes in the SwiftData DB? I'm aware that this is possible via Queries, but I need to fetch the data in background, so a query is not an option. I'm aware of the ModelContext.didSave / .willSave notifications, but these don't work with iOS 17. -> How can I observe changes to models of a certain type? I don't want to observe the whole database.

I'm looking for a tutorial or documentation on HMMatterRequestHandler. I'm aware of the brief mentions in wwdc21-10298 but it's not sufficient. Is there any tutorial/ more extensive documentation?