Datensicherheit: Backup, Verschlüsselung, App-Sperre (Kapitel 13.3)
Automatisches rollierendes Backup der Datenbank beim Start mit Wiederherstellung über die Einstellungen, versionierte Schema-Migration, optionale Passwort-Verschlüsselung der LiteDB-Datei und eine App-Sperre nach Inaktivität mit eigenem Passwort. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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@@ -218,5 +218,26 @@
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</DataTemplate>
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</ItemsControl.ItemTemplate>
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</ItemsControl>
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<!-- App-Sperre nach Inaktivität (13.3.5): blockiert die gesamte Oberfläche. -->
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<Border Background="#E6101014" IsVisible="{Binding AppLock.IsLocked}">
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<Border Width="320" Padding="24" CornerRadius="10"
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Background="{DynamicResource SystemControlBackgroundAltHighBrush}"
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HorizontalAlignment="Center" VerticalAlignment="Center">
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<StackPanel Spacing="12">
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<TextBlock Text="🔒" FontSize="28" HorizontalAlignment="Center"/>
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<TextBlock Text="LehrerApp gesperrt" FontSize="16" FontWeight="SemiBold"
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HorizontalAlignment="Center"/>
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<TextBox PlaceholderText="Passwort" PasswordChar="●"
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Text="{Binding AppLock.PasswordAttempt}"
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KeyDown="OnLockScreenKeyDown"/>
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<TextBlock Text="{Binding AppLock.UnlockError}" Foreground="Red" FontSize="12"
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HorizontalAlignment="Center"
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IsVisible="{Binding AppLock.UnlockError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
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<Button Content="Entsperren" Command="{Binding AppLock.UnlockCommand}"
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HorizontalAlignment="Stretch" HorizontalContentAlignment="Center"/>
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</StackPanel>
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</Border>
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</Border>
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</Panel>
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</Window>
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