refactor(backend): read artist credit from TrackArtists join

Drop the now-redundant Track.Artist string column now that every
track (local and YouTube) links its credited artists through
TrackArtist. TrackApplicationResponse formats the display string by
joining TrackArtists ordered by position, and every read query that
projects a track now includes TrackArtists/Artist so the join isn't
empty at response time.

backend/Musify.Application/PlayLists/GetPlayListTracks.cs

@@ -29,6 +29,8 @@ namespace Musify.Application.PlayLists
             var tracksQuery = database.PlayListHasTracks
                 .AsNoTracking()
                 .Include(plt => plt.Track)
+                    .ThenInclude(track => track.TrackArtists)
+                    .ThenInclude(trackArtist => trackArtist.Artist)
                 .Where(plt => plt.PlayListId == request.PlayListId);
 
             var totalCount = await tracksQuery.CountAsync(cancellationToken);

backend/Musify.Application/Services/YouTubeTrackProvisioner.cs

@@ -48,7 +48,6 @@ public sealed class YouTubeTrackProvisioner(
         {
             Title = title,
             NormalizedTitle = title.ToUpperInvariant(),
-            Artist = Truncate(song.Artist, 200),
             Source = TrackSource.YouTube,
             ExternalId = videoId,
             DownloadRequested = false,

backend/Musify.Application/Tracks/CreateTrack.cs

@@ -65,7 +65,6 @@ namespace Musify.Application.Tracks
             {
                 Title = request.Title,
                 NormalizedTitle = request.Title.ToUpperInvariant(),
-                Artist = user.Name,
                 OwnerUserId = user.Id,
                 OriginalPictureName = pictureIntent.ObjectName,
                 OriginalAudioName = audioIntent.ObjectName,

backend/Musify.Application/Tracks/GetListeningHistory.cs

@@ -24,6 +24,8 @@ namespace Musify.Application.Tracks
                 .ToListAsync(cancellationToken);
 
             var tracksById = await database.Tracks
+                .Include(t => t.TrackArtists)
+                    .ThenInclude(trackArtist => trackArtist.Artist)
                 .Where(t => recentTrackIds.Contains(t.Id))
                 .Select(t => new { t.Id, Track = t, ListensCount = t.ListeningHistories.Count } )
                 .ToDictionaryAsync(t => t.Id, cancellationToken);

backend/Musify.Application/Tracks/GetTrackById.cs

@@ -15,6 +15,8 @@ namespace Musify.Application.Tracks
         public async ValueTask<ErrorOr<TrackApplicationResponse>> Handle(GetTrackByIdQuery request, CancellationToken cancellationToken)
         {
             var entity = await database.Tracks.AsNoTracking()
+                .Include(t => t.TrackArtists)
+                    .ThenInclude(trackArtist => trackArtist.Artist)
                 .Where(t => t.Id == request.TrackId)
                 .Select(t => new { Track = t, ListensCount = t.ListeningHistories.Count })
                 .SingleOrDefaultAsync(cancellationToken);

backend/Musify.Application/Tracks/GetTracks.cs

@@ -20,6 +20,8 @@ namespace Musify.Application.Tracks
             var tracksQuery = database.UserHasTracks
                 .AsNoTracking()
                 .Include(ut => ut.Track)
+                    .ThenInclude(track => track.TrackArtists)
+                    .ThenInclude(trackArtist => trackArtist.Artist)
                 .AsQueryable();
 
             if (!string.IsNullOrEmpty(request.Name))

backend/Musify.Application/Tracks/GetTracksByUserId.cs

@@ -27,6 +27,8 @@ namespace Musify.Application.Tracks
             var tracksQuery = database.UserHasTracks
                 .AsNoTracking()
                 .Include(ut => ut.Track)
+                    .ThenInclude(track => track.TrackArtists)
+                    .ThenInclude(trackArtist => trackArtist.Artist)
                 .Where(p => p.UserId == request.UserId);
 
             if (!string.IsNullOrEmpty(request.Name))

backend/Musify.Application/Tracks/Responses/TrackApplicationResponse.cs

@@ -1,3 +1,4 @@
+using System.Linq;
 using Musify.Domain.Entities;
 using Musify.Domain.ValueObjects;
 
@@ -20,7 +21,7 @@ namespace Musify.Application.Tracks.Responses
             new(
                 track.Id,
                 track.Title,
-                track.Artist,
+                FormatArtist(track),
                 track.Source,
                 track.ExternalId,
                 track.AudioTranscodeProcessingStatus,
@@ -29,5 +30,15 @@ namespace Musify.Application.Tracks.Responses
                 track.OwnerUserId,
                 track.CreatedAt,
                 track.UpdatedAt);
+
+        private static string? FormatArtist(Track track)
+        {
+            if (track.TrackArtists.Count == 0)
+                return null;
+
+            return string.Join(", ", track.TrackArtists
+                .OrderBy(trackArtist => trackArtist.Position)
+                .Select(trackArtist => trackArtist.Artist.Name));
+        }
     }
 }

backend/Musify.Domain/Entities/Track.cs

@@ -23,9 +23,6 @@ namespace Musify.Domain.Entities
         [Required]
         public int Duration { get; set; }
 
-        [MaxLength(200)]
-        public string? Artist { get; set; }
-
         public long? OwnerUserId { get; set; }
 
         [Required]

backend/Musify.Infrastructure/Persistence/Migrations/20260716220047_DropTrackArtistColumn.Designer.cs

@@ -0,0 +1,822 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Musify.Infrastructure.Persistence;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace Musify.Infrastructure.Persistence.Migrations
+{
+    [DbContext(typeof(Database))]
+    [Migration("20260716220047_DropTrackArtistColumn")]
+    partial class DropTrackArtistColumn
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "10.0.8")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("MassTransit.EntityFrameworkCoreIntegration.InboxState", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<DateTime?>("Consumed")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("ConsumerId")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime?>("Delivered")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("ExpirationTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<long?>("LastSequenceNumber")
+                        .HasColumnType("bigint");
+
+                    b.Property<Guid>("LockId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("MessageId")
+                        .HasColumnType("uuid");
+
+                    b.Property<int>("ReceiveCount")
+                        .HasColumnType("integer");
+
+                    b.Property<DateTime>("Received")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<byte[]>("RowVersion")
+                        .IsConcurrencyToken()
+                        .ValueGeneratedOnAddOrUpdate()
+                        .HasColumnType("bytea");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Delivered");
+
+                    b.ToTable("InboxState");
+                });
+
+            modelBuilder.Entity("MassTransit.EntityFrameworkCoreIntegration.OutboxMessage", b =>
+                {
+                    b.Property<long>("SequenceNumber")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("SequenceNumber"));
+
+                    b.Property<string>("Body")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("ContentType")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<Guid?>("ConversationId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("CorrelationId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("DestinationAddress")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<DateTime?>("EnqueueTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("ExpirationTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("FaultAddress")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("Headers")
+                        .HasColumnType("text");
+
+                    b.Property<Guid?>("InboxConsumerId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("InboxMessageId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("InitiatorId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("MessageId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("MessageType")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<Guid?>("OutboxId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Properties")
+                        .HasColumnType("text");
+
+                    b.Property<Guid?>("RequestId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("ResponseAddress")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<DateTime>("SentTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("SourceAddress")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.HasKey("SequenceNumber");
+
+                    b.HasIndex("EnqueueTime");
+
+                    b.HasIndex("ExpirationTime");
+
+                    b.HasIndex("OutboxId", "SequenceNumber")
+                        .IsUnique();
+
+                    b.HasIndex("InboxMessageId", "InboxConsumerId", "SequenceNumber")
+                        .IsUnique();
+
+                    b.ToTable("OutboxMessage");
+                });
+
+            modelBuilder.Entity("MassTransit.EntityFrameworkCoreIntegration.OutboxState", b =>
+                {
+                    b.Property<Guid>("OutboxId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("Created")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("Delivered")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<long?>("LastSequenceNumber")
+                        .HasColumnType("bigint");
+
+                    b.Property<Guid>("LockId")
+                        .HasColumnType("uuid");
+
+                    b.Property<byte[]>("RowVersion")
+                        .IsConcurrencyToken()
+                        .ValueGeneratedOnAddOrUpdate()
+                        .HasColumnType("bytea");
+
+                    b.HasKey("OutboxId");
+
+                    b.HasIndex("Created");
+
+                    b.ToTable("OutboxState");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.Artist", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("ExternalId")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
+                    b.Property<string>("NormalizedName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<long?>("UserId")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ExternalId")
+                        .IsUnique();
+
+                    b.HasIndex("NormalizedName")
+                        .IsUnique()
+                        .HasFilter("\"ExternalId\" IS NULL AND \"UserId\" IS NULL");
+
+                    b.HasIndex("UserId")
+                        .IsUnique();
+
+                    b.ToTable("Artists");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.ListeningHistory", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("ListenedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("TrackId")
+                        .HasColumnType("uuid");
+
+                    b.Property<long>("UserId")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TrackId");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("ListeningHistory");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.PlayList", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Description")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("LargePictureName")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<int>("LifeCycleStatus")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("MediumPictureName")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<string>("NormalizedName")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<string>("OriginalPictureName")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("SmallPictureName")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<long>("UserId")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("PlayLists");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.PlayListHasTrack", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("AddedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("PlayListId")
+                        .HasColumnType("uuid");
+
+                    b.Property<int>("Position")
+                        .HasColumnType("integer");
+
+                    b.Property<Guid>("TrackId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("PlayListId");
+
+                    b.HasIndex("TrackId");
+
+                    b.ToTable("PlayListHasTrack");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.Track", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("AudioFolderName")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<int>("AudioTranscodeProcessingStatus")
+                        .HasColumnType("integer");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<bool>("DownloadRequested")
+                        .HasColumnType("boolean");
+
+                    b.Property<int>("Duration")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("ExternalId")
+                        .HasMaxLength(16)
+                        .HasColumnType("character varying(16)");
+
+                    b.Property<string>("LargePictureName")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<DateTime?>("LastRetryAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<int>("LifeCycleStatus")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("MediumPictureName")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("NormalizedTitle")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<string>("OriginalAudioName")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("OriginalPictureName")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<long?>("OwnerUserId")
+                        .HasColumnType("bigint");
+
+                    b.Property<int>("PicturesProcessingStatus")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("RetryCount")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("SmallPictureName")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<int>("Source")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("OwnerUserId");
+
+                    b.HasIndex("Source", "ExternalId")
+                        .IsUnique();
+
+                    b.ToTable("Tracks", t =>
+                        {
+                            t.HasCheckConstraint("CK_Tracks_OwnerUserId_Source", "(\"OwnerUserId\" IS NOT NULL) = (\"Source\" = 0)");
+                        });
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.TrackArtist", b =>
+                {
+                    b.Property<Guid>("TrackId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("ArtistId")
+                        .HasColumnType("uuid");
+
+                    b.Property<int>("Position")
+                        .HasColumnType("integer");
+
+                    b.HasKey("TrackId", "ArtistId");
+
+                    b.HasIndex("ArtistId");
+
+                    b.ToTable("TrackArtist");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.Upload", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Bucket")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("ContentType")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Key")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("State")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Upload");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.UploadIntent", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Bucket")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("ContentType")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<long?>("ExpectedSizeBytes")
+                        .HasColumnType("bigint");
+
+                    b.Property<DateTime>("ExpiresAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Key")
+                        .IsRequired()
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.Property<string>("ObjectName")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<int>("Purpose")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("Status")
+                        .HasColumnType("integer");
+
+                    b.Property<long>("UserId")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("UploadIntents");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.User", b =>
+                {
+                    b.Property<long>("Id")
+                        .HasColumnType("bigint");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("FirstName")
+                        .HasMaxLength(48)
+                        .HasColumnType("character varying(48)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(48)
+                        .HasColumnType("character varying(48)");
+
+                    b.Property<string>("NormalizedName")
+                        .IsRequired()
+                        .HasMaxLength(48)
+                        .HasColumnType("character varying(48)");
+
+                    b.Property<string>("ProfilePictureUrl")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<string>("SecondName")
+                        .HasMaxLength(48)
+                        .HasColumnType("character varying(48)");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("User");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.UserHasTrack", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("TrackId")
+                        .HasColumnType("uuid");
+
+                    b.Property<long>("UserId")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TrackId");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("UserHasTrack");
+                });
+
+            modelBuilder.Entity("Musify.Infrastructure.MassTransit.Sagas.PlayListProcessingState", b =>
+                {
+                    b.Property<Guid>("CorrelationId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Bucket")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("CurrentState")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("PictureKey")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("CorrelationId");
+
+                    b.ToTable("PlayListProcessingState");
+                });
+
+            modelBuilder.Entity("Musify.Infrastructure.MassTransit.Sagas.TrackProcessingState", b =>
+                {
+                    b.Property<Guid>("CorrelationId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("AudioKey")
+                        .HasColumnType("text");
+
+                    b.Property<bool>("AudioProcessed")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Bucket")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("CurrentState")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("PictureKey")
+                        .HasColumnType("text");
+
+                    b.Property<bool>("PictureProcessed")
+                        .HasColumnType("boolean");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("CorrelationId");
+
+                    b.ToTable("TrackProcessingState");
+                });
+
+            modelBuilder.Entity("MassTransit.EntityFrameworkCoreIntegration.OutboxMessage", b =>
+                {
+                    b.HasOne("MassTransit.EntityFrameworkCoreIntegration.OutboxState", null)
+                        .WithMany()
+                        .HasForeignKey("OutboxId");
+
+                    b.HasOne("MassTransit.EntityFrameworkCoreIntegration.InboxState", null)
+                        .WithMany()
+                        .HasForeignKey("InboxMessageId", "InboxConsumerId")
+                        .HasPrincipalKey("MessageId", "ConsumerId");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.Artist", b =>
+                {
+                    b.HasOne("Musify.Domain.Entities.User", "User")
+                        .WithMany()
+                        .HasForeignKey("UserId");
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.ListeningHistory", b =>
+                {
+                    b.HasOne("Musify.Domain.Entities.Track", "Track")
+                        .WithMany("ListeningHistories")
+                        .HasForeignKey("TrackId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Musify.Domain.Entities.User", "User")
+                        .WithMany("ListeningHistories")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Track");
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.PlayList", b =>
+                {
+                    b.HasOne("Musify.Domain.Entities.User", "User")
+                        .WithMany("PlayLists")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.PlayListHasTrack", b =>
+                {
+                    b.HasOne("Musify.Domain.Entities.PlayList", "PlayList")
+                        .WithMany("PlayListTracks")
+                        .HasForeignKey("PlayListId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Musify.Domain.Entities.Track", "Track")
+                        .WithMany("PlayListTracks")
+                        .HasForeignKey("TrackId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("PlayList");
+
+                    b.Navigation("Track");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.Track", b =>
+                {
+                    b.HasOne("Musify.Domain.Entities.User", "Owner")
+                        .WithMany()
+                        .HasForeignKey("OwnerUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("Owner");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.TrackArtist", b =>
+                {
+                    b.HasOne("Musify.Domain.Entities.Artist", "Artist")
+                        .WithMany("TrackArtists")
+                        .HasForeignKey("ArtistId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Musify.Domain.Entities.Track", "Track")
+                        .WithMany("TrackArtists")
+                        .HasForeignKey("TrackId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Artist");
+
+                    b.Navigation("Track");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.UploadIntent", b =>
+                {
+                    b.HasOne("Musify.Domain.Entities.User", "User")
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.UserHasTrack", b =>
+                {
+                    b.HasOne("Musify.Domain.Entities.Track", "Track")
+                        .WithMany("UserTracks")
+                        .HasForeignKey("TrackId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Musify.Domain.Entities.User", "User")
+                        .WithMany("UserTracks")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Track");
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.Artist", b =>
+                {
+                    b.Navigation("TrackArtists");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.PlayList", b =>
+                {
+                    b.Navigation("PlayListTracks");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.Track", b =>
+                {
+                    b.Navigation("ListeningHistories");
+
+                    b.Navigation("PlayListTracks");
+
+                    b.Navigation("TrackArtists");
+
+                    b.Navigation("UserTracks");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.User", b =>
+                {
+                    b.Navigation("ListeningHistories");
+
+                    b.Navigation("PlayLists");
+
+                    b.Navigation("UserTracks");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

backend/Musify.Infrastructure/Persistence/Migrations/20260716220047_DropTrackArtistColumn.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Musify.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class DropTrackArtistColumn : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "Artist",
+                table: "Tracks");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "Artist",
+                table: "Tracks",
+                type: "character varying(200)",
+                maxLength: 200,
+                nullable: true);
+        }
+    }
+}