Persist channel DRED settings

tests/VoiceCat.Tests/ChannelManagementTests.cs

@@ -99,4 +99,33 @@ public class ChannelManagementTests
         Assert.True(await ResultAsync(admin, new() { DeleteChannel = new() { ChannelId = child.Id } }));
         Assert.True(await ResultAsync(admin, new() { DeleteChannel = new() { ChannelId = parent.Id } }));
     }
+
+    [Fact]
+    public async Task DredAudioSettingsRoundTripThroughEditAndDatabaseRestart()
+    {
+        await using var fixture = new ServerFixture();
+        await using var admin = await AdminAsync(fixture);
+        using (var store = new AccountStore(Path.Combine(fixture.Directory, "voicecat.db")))
+        {
+            Channel music = store.LoadChannels().Single(c => c.Name == "Music Room");
+            music.Audio.SampleRate = 48_000;
+            music.Audio.BitrateBps = 128_000;
+            music.Audio.ExpectedPacketLoss = 15;
+            music.Audio.Dtx = true;
+            music.Audio.Fec = true;
+            music.Audio.Dred = true;
+            music.Audio.Complexity = 10;
+            Assert.True(await ResultAsync(admin, new() { EditChannel = new() { Channel = music } }));
+        }
+
+        using var reopened = new AccountStore(Path.Combine(fixture.Directory, "voicecat.db"));
+        AudioConfig audio = reopened.LoadChannels().Single(c => c.Name == "Music Room").Audio;
+        Assert.Equal(48_000U, audio.SampleRate);
+        Assert.Equal(128_000U, audio.BitrateBps);
+        Assert.Equal(15U, audio.ExpectedPacketLoss);
+        Assert.True(audio.Dtx);
+        Assert.True(audio.Fec);
+        Assert.True(audio.Dred);
+        Assert.Equal(10U, audio.Complexity);
+    }
 }