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added to queue - resetInactivityTimer() is called - Line 146: inactivityTimer?.invalidate() - cancels any existing timer - Line 157: Starts a new 30-second timer - Log: [BackupQueueManager] Starting backup timer for 30 seconds - Log: [BackupQueueManager] Queue has 1 photos to upload, 0 to delete 2. Second star (at 10 seconds): - Photo 2 added to queue - resetInactivityTimer() is called again - Line 146: inactivityTimer?.invalidate() - cancels the previous timer (that had 20 seconds left) - Line 157: Starts a new 30-second timer - Log: [BackupQueueManager] Starting backup timer for 30 seconds - Log: [BackupQueueManager] Queue has 2 photos to upload, 0 to delete 3. After 30 seconds of no activity (at 40 seconds total): - Timer fi res - performAutoBackup() is called - Both photos are uploaded together - Log: Auto-backup triggered after 0 minutes of inactivity - Log: [BackupQueueManager] Starting upload of 2 photos