Jul 27 - Update code for scheduled tasks 4

JanitorialQC/Sync/SyncManager.swift

@@ -10,6 +10,7 @@ import SwiftData
 import SwiftUI
 import Combine
 import UserNotifications
+import UIKit   // beginBackgroundTask — see beginSyncBackgroundTask()
 
 @MainActor
 class SyncManager: ObservableObject {
@@ -110,6 +111,36 @@ class SyncManager: ObservableObject {
         pollTask = nil
     }
 
+    // ── Background task assertion ─────────────────────────────────────────
+    // Keeps the process alive across a suspend so an in-flight sync can finish.
+    // Distinct from the BGProcessingTask in JanitorialQCApp: that one asks iOS
+    // to WAKE us later, this one asks it not to suspend us right now.
+
+    private var syncBackgroundTaskId: UIBackgroundTaskIdentifier = .invalid
+
+    private func beginSyncBackgroundTask() {
+        // triggerSync() is re-entrancy guarded, but assert defensively anyway:
+        // beginning a second assertion would leak the first identifier.
+        guard syncBackgroundTaskId == .invalid else { return }
+        syncBackgroundTaskId = UIApplication.shared.beginBackgroundTask(
+            withName: "JQC.syncDrain"
+        ) {
+            // Called on the main thread when the grace period runs out. It MUST
+            // end the assertion or iOS terminates the app. assumeIsolated is
+            // required because the handler is a nonisolated closure under
+            // SWIFT_DEFAULT_ACTOR_ISOLATION = MainActor.
+            MainActor.assumeIsolated {
+                SyncManager.shared.endSyncBackgroundTask()
+            }
+        }
+    }
+
+    private func endSyncBackgroundTask() {
+        guard syncBackgroundTaskId != .invalid else { return }
+        UIApplication.shared.endBackgroundTask(syncBackgroundTaskId)
+        syncBackgroundTaskId = .invalid
+    }
+
     /// Called on logout so the next login starts a clean fetch.
     func resetNotificationPoller() {
         lastNotificationFetch   = nil
@@ -232,6 +263,15 @@ class SyncManager: ObservableObject {
         syncError = nil
         defer { isSyncing = false }
 
+        // Ask iOS to keep the process alive long enough to finish the drain.
+        // The case this covers: an inspector taps Submit and immediately locks
+        // the iPad or swipes to another app. Without an assertion the process
+        // suspends mid-upload and the work waits for the next launch.
+        // Roughly 30 s of grace; the expiration handler ends it cleanly so iOS
+        // never force-kills us. Harmless in the foreground — it simply ends.
+        beginSyncBackgroundTask()
+        defer { endSyncBackgroundTask() }
+
         await processPhotoQueue(context: context)
         await processInspectionQueue(context: context)
         await processIssueQueue(context: context)