diff --git a/ErsatzTV.Scanner/Core/Jellyfin/JellyfinMusicVideoLibraryScanner.cs b/ErsatzTV.Scanner/Core/Jellyfin/JellyfinMusicVideoLibraryScanner.cs
index 0b2936e22..90c5f5528 100644
--- a/ErsatzTV.Scanner/Core/Jellyfin/JellyfinMusicVideoLibraryScanner.cs
+++ b/ErsatzTV.Scanner/Core/Jellyfin/JellyfinMusicVideoLibraryScanner.cs
@@ -263,11 +263,112 @@ public class JellyfinMusicVideoLibraryScanner : IJellyfinMusicVideoLibraryScanne
             existing.DateUpdated = DateTime.UtcNow;
             existing.MetadataKind = MetadataKind.External;
 
-            return await _metadataRepository.Update(existing);
+            bool updated = await _metadataRepository.Update(existing);
+
+            // ersatztv#497: the scalar Update above marks only the metadata row Modified; it does NOT touch
+            // child collections, and MusicVideoRepository.GetOrAdd loads them AsNoTracking — so tag/genre/studio/
+            // artist edits made in Jellyfin never reached an EXISTING music video (only the Add path persisted
+            // them). Reconcile the collections that BOTH the Add path persists AND GetOrAdd eager-loads:
+            // Genres, Tags, Studios, Artists. (Guids are add-persisted but not eager-loaded here — reconciling
+            // them would see an empty `existing` and duplicate-insert every scan; Directors are eager-loaded
+            // but not add-persisted for music videos — both are deliberately out of scope.) Mirrors the
+            // remove-stale + add-new idiom PlexMovieLibraryScanner.UpdateMetadata uses.
+            updated = await ReconcileGenres(existing, incoming) || updated;
+            updated = await ReconcileTags(existing, incoming) || updated;
+            updated = await ReconcileStudios(existing, incoming) || updated;
+            updated = await ReconcileArtists(existing, incoming) || updated;
+
+            return updated;
         }
 
         incoming.MusicVideoId = musicVideo.Id;
         musicVideo.MusicVideoMetadata = [incoming];
         return await _metadataRepository.Add(incoming);
     }
+
+    private async Task<bool> ReconcileGenres(MusicVideoMetadata existing, MusicVideoMetadata incoming)
+    {
+        existing.Genres ??= [];
+        List<Genre> incomingGenres = incoming.Genres ?? [];
+        var updated = false;
+
+        foreach (Genre genre in existing.Genres.Filter(g => incomingGenres.All(g2 => g2.Name != g.Name)).ToList())
+        {
+            existing.Genres.Remove(genre);
+            updated = await _metadataRepository.RemoveGenre(genre) || updated;
+        }
+
+        foreach (Genre genre in incomingGenres.Filter(g => existing.Genres.All(g2 => g2.Name != g.Name)).ToList())
+        {
+            existing.Genres.Add(genre);
+            updated = await _musicVideoRepository.AddGenre(existing, genre) || updated;
+        }
+
+        return updated;
+    }
+
+    private async Task<bool> ReconcileTags(MusicVideoMetadata existing, MusicVideoMetadata incoming)
+    {
+        existing.Tags ??= [];
+        List<Tag> incomingTags = incoming.Tags ?? [];
+        var updated = false;
+
+        foreach (Tag tag in existing.Tags.Filter(t => incomingTags.All(t2 => t2.Name != t.Name)).ToList())
+        {
+            existing.Tags.Remove(tag);
+            updated = await _metadataRepository.RemoveTag(tag) || updated;
+        }
+
+        foreach (Tag tag in incomingTags.Filter(t => existing.Tags.All(t2 => t2.Name != t.Name)).ToList())
+        {
+            existing.Tags.Add(tag);
+            updated = await _musicVideoRepository.AddTag(existing, tag) || updated;
+        }
+
+        return updated;
+    }
+
+    private async Task<bool> ReconcileStudios(MusicVideoMetadata existing, MusicVideoMetadata incoming)
+    {
+        existing.Studios ??= [];
+        List<Studio> incomingStudios = incoming.Studios ?? [];
+        var updated = false;
+
+        foreach (Studio studio in existing.Studios.Filter(s => incomingStudios.All(s2 => s2.Name != s.Name)).ToList())
+        {
+            existing.Studios.Remove(studio);
+            updated = await _metadataRepository.RemoveStudio(studio) || updated;
+        }
+
+        foreach (Studio studio in incomingStudios.Filter(s => existing.Studios.All(s2 => s2.Name != s.Name)).ToList())
+        {
+            existing.Studios.Add(studio);
+            updated = await _musicVideoRepository.AddStudio(existing, studio) || updated;
+        }
+
+        return updated;
+    }
+
+    private async Task<bool> ReconcileArtists(MusicVideoMetadata existing, MusicVideoMetadata incoming)
+    {
+        existing.Artists ??= [];
+        List<MusicVideoArtist> incomingArtists = incoming.Artists ?? [];
+        var updated = false;
+
+        foreach (MusicVideoArtist artist in existing.Artists
+                     .Filter(a => incomingArtists.All(a2 => a2.Name != a.Name)).ToList())
+        {
+            existing.Artists.Remove(artist);
+            updated = await _musicVideoRepository.RemoveArtist(artist) || updated;
+        }
+
+        foreach (MusicVideoArtist artist in incomingArtists
+                     .Filter(a => existing.Artists.All(a2 => a2.Name != a.Name)).ToList())
+        {
+            existing.Artists.Add(artist);
+            updated = await _musicVideoRepository.AddArtist(existing, artist) || updated;
+        }
+
+        return updated;
+    }
 }
diff --git a/ErsatzTV.Tests/Integration/JellyfinMusicVideoLibraryScannerTests.cs b/ErsatzTV.Tests/Integration/JellyfinMusicVideoLibraryScannerTests.cs
index 2cd5d22e2..d1354f379 100644
--- a/ErsatzTV.Tests/Integration/JellyfinMusicVideoLibraryScannerTests.cs
+++ b/ErsatzTV.Tests/Integration/JellyfinMusicVideoLibraryScannerTests.cs
@@ -3,6 +3,7 @@ using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Jellyfin;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Jellyfin;
+using ErsatzTV.Core.Metadata;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Data.Repositories;
 using ErsatzTV.Scanner.Core.Interfaces;
@@ -16,6 +17,7 @@ using NUnit.Framework;
 using Shouldly;
 using IFileSystem = System.IO.Abstractions.IFileSystem;
 using Unit = LanguageExt.Unit;
+using static LanguageExt.Prelude;
 
 namespace ErsatzTV.Tests.Integration;
 
@@ -276,6 +278,150 @@ public class JellyfinMusicVideoLibraryScannerTests
         await scannerProxy.DidNotReceive().RemoveMediaItems(Arg.Any<int[]>(), Arg.Any<CancellationToken>());
     }
 
+    // ersatztv#497: metadata edits (genres/tags/studios/artists) made in Jellyfin to an EXISTING music video
+    // must reach ErsatzTV on the next scan. Before the fix, UpdateMetadata copied only scalar fields, so the
+    // update path silently dropped every child collection — add-new AND remove-stale. This is an interaction
+    // test: the repositories are substituted and GetOrAdd returns a canned existing item so we can verify the
+    // scanner issues the exact reconcile calls. (The real-DB double-scan approach can't drive this here: the
+    // in-memory harness shares ONE SQLite connection across contexts, and mid-scan GetOrAdd's
+    // `MediaVersions.First().MediaFiles.First().Path` predicate mis-resolves once the existing item carries
+    // metadata children — a harness-only quirk; prod uses per-context pooled connections and looks music videos
+    // up by that predicate only because they carry no server ItemId. See the #497 close comment.)
+    // Non-vacuous: reverting the Reconcile* calls in UpdateMetadata drops every Received() below.
+    [Test]
+    public async Task ScanLibrary_Should_Reconcile_Metadata_Collections_On_Rescan_Of_Existing_Item()
+    {
+        JellyfinLibrary library = BuildLibrary(1, "/data/music");
+        var connectionParameters = new JellyfinConnectionParameters("http://jellyfin", "api-key", 1);
+        const string VideoPath = "/data/music/artist1/song1.mkv";
+
+        // the EXISTING item already in ErsatzTV, with the collections Jellyfin first gave it
+        var existing = new MusicVideo
+        {
+            Id = 7,
+            ArtistId = 3,
+            MediaVersions = new List<MediaVersion>
+            {
+                new() { MediaFiles = new List<MediaFile> { new() { Path = VideoPath } }, Streams = new List<MediaStream>() }
+            },
+            MusicVideoMetadata = new List<MusicVideoMetadata>
+            {
+                new()
+                {
+                    Id = 11,
+                    Genres = new List<Genre> { new() { Name = "Synthwave" }, new() { Name = "Retro" } },
+                    Tags = new List<Tag> { new() { Name = "KeepTag" }, new() { Name = "DropTag" } },
+                    Studios = new List<Studio> { new() { Name = "OldStudio" } },
+                    Artists = new List<MusicVideoArtist> { new() { Name = "Artist 1" }, new() { Name = "Featured X" } }
+                }
+            }
+        };
+
+        var artistRepository = Substitute.For<IArtistRepository>();
+        artistRepository.GetArtistByMetadata(Arg.Any<int>(), Arg.Any<ArtistMetadata>())
+            .Returns(Some(new Artist { Id = 3, ArtistMetadata = new List<ArtistMetadata>() }));
+        artistRepository.DeleteEmptyArtists(Arg.Any<LibraryPath>()).Returns(new List<int>());
+
+        var musicVideoRepository = Substitute.For<IMusicVideoRepository>();
+        musicVideoRepository
+            .GetOrAdd(Arg.Any<Artist>(), Arg.Any<LibraryPath>(), Arg.Any<LibraryFolder>(), Arg.Any<string>())
+            .Returns(Right<BaseError, MediaItemScanResult<MusicVideo>>(
+                new MediaItemScanResult<MusicVideo>(existing) { IsAdded = false }));
+        musicVideoRepository.FindMusicVideoPaths(Arg.Any<LibraryPath>())
+            .Returns(new List<string> { VideoPath }.AsEnumerable());
+        musicVideoRepository.AddGenre(Arg.Any<MusicVideoMetadata>(), Arg.Any<Genre>()).Returns(true);
+        musicVideoRepository.AddTag(Arg.Any<MusicVideoMetadata>(), Arg.Any<Tag>()).Returns(true);
+        musicVideoRepository.AddStudio(Arg.Any<MusicVideoMetadata>(), Arg.Any<Studio>()).Returns(true);
+        musicVideoRepository.AddArtist(Arg.Any<MusicVideoMetadata>(), Arg.Any<MusicVideoArtist>()).Returns(true);
+        musicVideoRepository.RemoveArtist(Arg.Any<MusicVideoArtist>()).Returns(true);
+
+        var metadataRepository = Substitute.For<IMetadataRepository>();
+        metadataRepository.Update(Arg.Any<ErsatzTV.Core.Domain.Metadata>()).Returns(true);
+        metadataRepository.UpdateStatistics(Arg.Any<MediaItem>(), Arg.Any<MediaVersion>(), Arg.Any<bool>()).Returns(false);
+        metadataRepository.RemoveGenre(Arg.Any<Genre>()).Returns(true);
+        metadataRepository.RemoveTag(Arg.Any<Tag>()).Returns(true);
+        metadataRepository.RemoveStudio(Arg.Any<Studio>()).Returns(true);
+
+        var libraryRepository = Substitute.For<ILibraryRepository>();
+        libraryRepository.GetParentFolderId(Arg.Any<LibraryPath>(), Arg.Any<string>(), Arg.Any<CancellationToken>())
+            .Returns(Option<int>.None);
+        libraryRepository.GetOrAddFolder(Arg.Any<LibraryPath>(), Arg.Any<Option<int>>(), Arg.Any<string>())
+            .Returns(new LibraryFolder { Id = 5, Path = "/data/music/artist1" });
+
+        JellyfinMusicVideoLibraryScanner scanner = BuildScannerWith(
+            FakeApi(() => BuildIncoming(
+                VideoPath, "Artist 1", "Song 1",
+                genres: new[] { "Synthwave", "Vaporwave" },
+                tags: new[] { "KeepTag", "NewTag" },
+                studios: new[] { "NewStudio" },
+                artists: new[] { "Artist 1", "Featured Y" })),
+            artistRepository,
+            musicVideoRepository,
+            libraryRepository,
+            metadataRepository);
+
+        (await scanner.ScanLibrary(connectionParameters, library, deepScan: false, CancellationToken.None))
+            .IsRight.ShouldBeTrue();
+
+        // remove-stale: Retro / DropTag / OldStudio / "Featured X" gone; kept items are NOT removed
+        await metadataRepository.Received(1).RemoveGenre(Arg.Is<Genre>(g => g.Name == "Retro"));
+        await metadataRepository.DidNotReceive().RemoveGenre(Arg.Is<Genre>(g => g.Name == "Synthwave"));
+        await metadataRepository.Received(1).RemoveTag(Arg.Is<Tag>(t => t.Name == "DropTag"));
+        await metadataRepository.DidNotReceive().RemoveTag(Arg.Is<Tag>(t => t.Name == "KeepTag"));
+        await metadataRepository.Received(1).RemoveStudio(Arg.Is<Studio>(s => s.Name == "OldStudio"));
+        await musicVideoRepository.Received(1).RemoveArtist(Arg.Is<MusicVideoArtist>(a => a.Name == "Featured X"));
+        await musicVideoRepository.DidNotReceive().RemoveArtist(Arg.Is<MusicVideoArtist>(a => a.Name == "Artist 1"));
+
+        // add-new: Vaporwave / NewTag / NewStudio / "Featured Y" added; kept items are NOT re-added
+        await musicVideoRepository.Received(1)
+            .AddGenre(Arg.Any<MusicVideoMetadata>(), Arg.Is<Genre>(g => g.Name == "Vaporwave"));
+        await musicVideoRepository.DidNotReceive()
+            .AddGenre(Arg.Any<MusicVideoMetadata>(), Arg.Is<Genre>(g => g.Name == "Synthwave"));
+        await musicVideoRepository.Received(1)
+            .AddTag(Arg.Any<MusicVideoMetadata>(), Arg.Is<Tag>(t => t.Name == "NewTag"));
+        await musicVideoRepository.DidNotReceive()
+            .AddTag(Arg.Any<MusicVideoMetadata>(), Arg.Is<Tag>(t => t.Name == "KeepTag"));
+        await musicVideoRepository.Received(1)
+            .AddStudio(Arg.Any<MusicVideoMetadata>(), Arg.Is<Studio>(s => s.Name == "NewStudio"));
+        await musicVideoRepository.Received(1)
+            .AddArtist(Arg.Any<MusicVideoMetadata>(), Arg.Is<MusicVideoArtist>(a => a.Name == "Featured Y"));
+        await musicVideoRepository.DidNotReceive()
+            .AddArtist(Arg.Any<MusicVideoMetadata>(), Arg.Is<MusicVideoArtist>(a => a.Name == "Artist 1"));
+    }
+
+    private JellyfinMusicVideoLibraryScanner BuildScannerWith(
+        IJellyfinApiClient apiClient,
+        IArtistRepository artistRepository,
+        IMusicVideoRepository musicVideoRepository,
+        ILibraryRepository libraryRepository,
+        IMetadataRepository metadataRepository)
+    {
+        var pathReplacement = Substitute.For<IJellyfinPathReplacementService>();
+        pathReplacement
+            .GetReplacementJellyfinPath(Arg.Any<List<JellyfinPathReplacement>>(), Arg.Any<string>(), Arg.Any<bool>())
+            .Returns(ci => ci.ArgAt<string>(1));
+
+        var mediaSourceRepository = Substitute.For<IMediaSourceRepository>();
+        mediaSourceRepository.GetJellyfinPathReplacements(Arg.Any<int>())
+            .Returns(Task.FromResult(new List<JellyfinPathReplacement>()));
+
+        var scannerProxy = Substitute.For<IScannerProxy>();
+        scannerProxy.UpdateProgress(Arg.Any<decimal>(), Arg.Any<CancellationToken>()).Returns(true);
+        scannerProxy.ReindexMediaItems(Arg.Any<int[]>(), Arg.Any<CancellationToken>()).Returns(true);
+        scannerProxy.RemoveMediaItems(Arg.Any<int[]>(), Arg.Any<CancellationToken>()).Returns(true);
+
+        return new JellyfinMusicVideoLibraryScanner(
+            scannerProxy,
+            apiClient,
+            pathReplacement,
+            mediaSourceRepository,
+            artistRepository,
+            musicVideoRepository,
+            libraryRepository,
+            metadataRepository,
+            NullLogger<JellyfinMusicVideoLibraryScanner>.Instance);
+    }
+
     private async Task<int> MusicVideoId(string path)
     {
         await using TvContext context = _db.CreateContext();
@@ -377,7 +523,14 @@ public class JellyfinMusicVideoLibraryScannerTests
         };
     }
 
-    private static MusicVideo BuildIncoming(string path, string artistName, string title) =>
+    private static MusicVideo BuildIncoming(
+        string path,
+        string artistName,
+        string title,
+        IEnumerable<string> genres = null,
+        IEnumerable<string> tags = null,
+        IEnumerable<string> studios = null,
+        IEnumerable<string> artists = null) =>
         new()
         {
             MediaVersions = new List<MediaVersion>
@@ -385,7 +538,8 @@ public class JellyfinMusicVideoLibraryScannerTests
                 new()
                 {
                     MediaFiles = new List<MediaFile> { new() { Path = path } },
-                    Streams = new List<MediaStream>()
+                    Streams = new List<MediaStream>(),
+                    Chapters = new List<MediaChapter>()
                 }
             },
             MusicVideoMetadata = new List<MusicVideoMetadata>
@@ -393,7 +547,11 @@ public class JellyfinMusicVideoLibraryScannerTests
                 new()
                 {
                     Title = title,
-                    Artists = new List<MusicVideoArtist> { new() { Name = artistName } }
+                    Genres = (genres ?? Enumerable.Empty<string>()).Select(g => new Genre { Name = g }).ToList(),
+                    Tags = (tags ?? Enumerable.Empty<string>()).Select(t => new Tag { Name = t }).ToList(),
+                    Studios = (studios ?? Enumerable.Empty<string>()).Select(s => new Studio { Name = s }).ToList(),
+                    Artists = (artists ?? new[] { artistName })
+                        .Select(a => new MusicVideoArtist { Name = a }).ToList()
                 }
             }
         };