Editing Openai/691a5ca1-2b1c-8010-8cbd-8797f95aa8d9 (section)

===== You can register a BGAppRefreshTask: =====
* On sceneWillResignActive, schedule a refresh task for, say, 30–60 min in the future.
* In the task handler: - Run the same Core Motion history reconciliation. - Update SwiftData. - If you see they’re well past 4 hours (and no notification has fired yet), send one now.

You have to accept:
* BGTasks are not guaranteed to fire on schedule. They’re “when the system feels like it”.Apple Developer<ref>{{cite web|title=Apple Developer|url=https://developer.apple.com/documentation/backgroundtasks/bgtaskscheduler|publisher=Apple Developer|access-date=2025-11-17}}</ref>
* This is more “nudge the user if they forget the app exists”, not “tachograph-level compliance.”

So the real-time guarantee only exists while you’re alive under a background mode; outside of that, it’s “best effort”.