Add automatic database backups

Elwig/App.xaml.cs

@@ -28,6 +28,8 @@ namespace Elwig {
         public static bool ForceShutdown { get; private set; } = false;
 
         private readonly DispatcherTimer _autoUpdateTimer = new() { Interval = TimeSpan.FromHours(1) };
+        private readonly DispatcherTimer _autoBackupTimer = new() { Interval = TimeSpan.FromHours(1) };
+        private DatabaseBackupService? _databaseBackupService;
         public readonly SerialPortWatcher SerialPortWatcher = new();
 
         public static readonly string DataPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData), "Elwig");
@@ -101,6 +103,13 @@ namespace Elwig {
                 return;
             }
 
+            if (Config.DatabaseBackup) {
+                _databaseBackupService = new DatabaseBackupService(Config.DatabaseFile);
+                await _databaseBackupService.RunIfNeededAsync();
+                _autoBackupTimer.Tick += OnAutoBackupTimer;
+                _autoBackupTimer.Start();
+            }
+
             LastChanged = CurrentLastWrite;
             ContextTimer.Start();
 
@@ -191,6 +200,7 @@ namespace Elwig {
         }
 
         private async void Application_Exit(object sender, ExitEventArgs evt) {
+            _autoBackupTimer.Stop();
             SerialPortWatcher.Dispose();
             foreach (var s in EventScales) {
                 s.Dispose();
@@ -198,6 +208,12 @@ namespace Elwig {
             await Pdf.Cleanup();
         }
 
+        private async void OnAutoBackupTimer(object? sender, EventArgs evt) {
+            if (_databaseBackupService != null) {
+                await _databaseBackupService.RunIfNeededAsync();
+            }
+        }
+
         public static void SetBranch(Branch b) {
             SetBranch((b.ZwstId, b.Name, b.PostalDest?.AtPlz?.Plz, b.PostalDest?.AtPlz?.Ort.Name, b.Address, b.PhoneNr, b.FaxNr, b.MobileNr));
         }