fix(backend): make track media fields and external id nullable

Artist, ExternalId, OriginalPictureName and OriginalAudioName were
non-nullable with '' sentinels, which forced the unique (Source,
ExternalId) index to rely on a filtered "<> ''" clause. Make them
truly nullable and drop the empty-string sentinels, backfilling
existing rows to NULL. Also fixes a formatting regression
(`track != null&&`) introduced alongside the nullability change.

backend/Musify.Application/PlayLists/AddYouTubeTrackToPlayList.cs

@@ -120,8 +120,8 @@ namespace Musify.Application.PlayLists
                 ExternalId = request.VideoId,
                 DownloadRequested = true,
                 Duration = request.DurationSeconds,
-                OriginalPictureName = string.Empty,
+                OriginalPictureName = null,
-                OriginalAudioName = string.Empty,
+                OriginalAudioName = null,
                 SmallPictureName = trackConfiguration.Routes.PresetSmallPicture,
                 MediumPictureName = trackConfiguration.Routes.PresetMediumPicture,
                 LargePictureName = trackConfiguration.Routes.PresetLargePicture,

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

@@ -6,9 +6,9 @@ namespace Musify.Application.Tracks.Responses
     public record TrackApplicationResponse(
         Guid Id,
         string Title,
-        string Artist,
+        string? Artist,
         TrackSource Source,
-        string ExternalId,
+        string? ExternalId,
         ProcessingStatus AudioStatus,
         int Duration,
         int ListensCount,

backend/Musify.Application/YouTube/GetYouTubeTrackStream.cs

@@ -91,8 +91,8 @@ namespace Musify.Application.YouTube
                 ExternalId = videoId,
                 DownloadRequested = false,
                 Duration = song.DurationSeconds,
-                OriginalPictureName = string.Empty,
+                OriginalPictureName = null,
-                OriginalAudioName = string.Empty,
+                OriginalAudioName = null,
                 SmallPictureName = trackConfiguration.Routes.PresetSmallPicture,
                 MediumPictureName = trackConfiguration.Routes.PresetMediumPicture,
                 LargePictureName = trackConfiguration.Routes.PresetLargePicture,

backend/Musify.Domain/Entities/Track.cs

@@ -1,4 +1,4 @@
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
 using System.Diagnostics.CodeAnalysis;
 using Musify.Domain.Abstractions;
@@ -23,23 +23,20 @@ namespace Musify.Domain.Entities
         [Required]
         public int Duration { get; set; }
 
-        [Required]
         [MaxLength(200)]
-        public string Artist { get; set; } = string.Empty;
+        public string? Artist { get; set; }
 
         [Required]
         public TrackSource Source { get; set; } = TrackSource.Local;
 
-        [Required]
         [MaxLength(16)]
-        public string ExternalId { get; set; } = string.Empty;
+        public string? ExternalId { get; set; }
 
         [Required]
         public bool DownloadRequested { get; set; } = false;
 
-        [Required]
         [MaxLength(64)]
-        public required string OriginalPictureName { get; set; }
+        public string? OriginalPictureName { get; set; }
 
         [MaxLength(64)]
         public string? SmallPictureName { get; set; }
@@ -50,9 +47,8 @@ namespace Musify.Domain.Entities
         [MaxLength(64)]
         public string? LargePictureName { get; set; }
 
-        [Required]
         [MaxLength(64)]
-        public required string OriginalAudioName { get; set; }
+        public string? OriginalAudioName { get; set; }
 
         [MaxLength(64)]
         public string? AudioFolderName { get; set; }

backend/Musify.Infrastructure/MassTransit/Logs/UpdateTrackPictureLog.cs

@@ -2,8 +2,8 @@ namespace Musify.Infrastructure.MassTransit.Logs
 {
     public record UpdateTrackPictureLog(
         Guid TrackId,
-        string PreviousOriginalPictureKey,
+        string? PreviousOriginalPictureKey,
-    string? PreviousSmallPictureKey,
+        string? PreviousSmallPictureKey,
-    string? PreviousMediumPictureKey,
+        string? PreviousMediumPictureKey,
-    string? PreviousLargePictureKey);
+        string? PreviousLargePictureKey);
 }

backend/Musify.Infrastructure/MassTransit/RoutingSlip/Builders/DeleteTrackRoutingSlipBuilder.cs

@@ -41,12 +41,15 @@ namespace Musify.Infrastructure.MassTransit.RoutingSlip.Builders
             {
                 var bucket = storageConfiguration.Bucket;
 
-                routingSlipBuilder.AddActivity(
+                if (!string.IsNullOrEmpty(track.OriginalPictureName))
-                    ActivityNames.RemoveTrackOriginalPicture,
+                {
-                    EndpointHelper.BuildExecuteActivityUri(RemoveFileFromBucketActivity.ExecuteEndpointName),
+                    routingSlipBuilder.AddActivity(
-                    new RemoveFileFromBucketArguments(
+                        ActivityNames.RemoveTrackOriginalPicture,
-                        bucket,
+                        EndpointHelper.BuildExecuteActivityUri(RemoveFileFromBucketActivity.ExecuteEndpointName),
-                        trackConfiguration.Routes.BuildOriginalPicturePath(userId, track.OriginalPictureName)));
+                        new RemoveFileFromBucketArguments(
+                            bucket,
+                            trackConfiguration.Routes.BuildOriginalPicturePath(userId, track.OriginalPictureName)));
+                }
 
                 if (track.IsPicturesProcessed)
                 {
@@ -72,12 +75,15 @@ namespace Musify.Infrastructure.MassTransit.RoutingSlip.Builders
                             trackConfiguration.Routes.BuildLargePicturePath(track.LargePictureName)));
                 }
 
-                routingSlipBuilder.AddActivity(
+                if (!string.IsNullOrEmpty(track.OriginalAudioName))
-                    ActivityNames.RemoveTrackOriginalAudio,
+                {
-                    EndpointHelper.BuildExecuteActivityUri(RemoveFileFromBucketActivity.ExecuteEndpointName),
+                    routingSlipBuilder.AddActivity(
-                    new RemoveFileFromBucketArguments(
+                        ActivityNames.RemoveTrackOriginalAudio,
-                        bucket,
+                        EndpointHelper.BuildExecuteActivityUri(RemoveFileFromBucketActivity.ExecuteEndpointName),
-                        trackConfiguration.Routes.BuildOriginalAudioPath(userId, track.OriginalAudioName)));
+                        new RemoveFileFromBucketArguments(
+                            bucket,
+                            trackConfiguration.Routes.BuildOriginalAudioPath(userId, track.OriginalAudioName)));
+                }
 
                 if (track.IsAudioProcessed)
                 {

backend/Musify.Infrastructure/Persistence/Database.cs

@@ -32,8 +32,7 @@ namespace Musify.Infrastructure.Persistence
 
             modelBuilder.Entity<Track>()
                 .HasIndex(track => new { track.Source, track.ExternalId })
-                .IsUnique()
+                .IsUnique();
-                .HasFilter("\"ExternalId\" <> ''");
 
             var playListProcessing = modelBuilder.Entity<PlayListProcessingState>();
             playListProcessing.HasKey(state => state.CorrelationId);

backend/Musify.Infrastructure/Persistence/Migrations/20260716214442_MakeTrackMediaAndExternalIdNullable.Designer.cs

@@ -0,0 +1,711 @@
+// <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("20260716214442_MakeTrackMediaAndExternalIdNullable")]
+    partial class MakeTrackMediaAndExternalIdNullable
+    {
+        /// <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.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>("Artist")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
+                    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<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("Source", "ExternalId")
+                        .IsUnique();
+
+                    b.ToTable("Tracks");
+                });
+
+            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.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.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.PlayList", b =>
+                {
+                    b.Navigation("PlayListTracks");
+                });
+
+            modelBuilder.Entity("Musify.Domain.Entities.Track", b =>
+                {
+                    b.Navigation("ListeningHistories");
+
+                    b.Navigation("PlayListTracks");
+
+                    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/20260716214442_MakeTrackMediaAndExternalIdNullable.cs

@@ -0,0 +1,132 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Musify.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class MakeTrackMediaAndExternalIdNullable : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_Tracks_Source_ExternalId",
+                table: "Tracks");
+
+            migrationBuilder.AlterColumn<string>(
+                name: "OriginalPictureName",
+                table: "Tracks",
+                type: "character varying(64)",
+                maxLength: 64,
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "character varying(64)",
+                oldMaxLength: 64);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "OriginalAudioName",
+                table: "Tracks",
+                type: "character varying(64)",
+                maxLength: 64,
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "character varying(64)",
+                oldMaxLength: 64);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "ExternalId",
+                table: "Tracks",
+                type: "character varying(16)",
+                maxLength: 16,
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "character varying(16)",
+                oldMaxLength: 16);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "Artist",
+                table: "Tracks",
+                type: "character varying(200)",
+                maxLength: 200,
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "character varying(200)",
+                oldMaxLength: 200);
+
+            migrationBuilder.Sql("UPDATE \"Tracks\" SET \"ExternalId\" = NULL WHERE \"ExternalId\" = '';");
+            migrationBuilder.Sql("UPDATE \"Tracks\" SET \"Artist\" = NULL WHERE \"Artist\" = '';");
+            migrationBuilder.Sql("UPDATE \"Tracks\" SET \"OriginalPictureName\" = NULL WHERE \"OriginalPictureName\" = '';");
+            migrationBuilder.Sql("UPDATE \"Tracks\" SET \"OriginalAudioName\" = NULL WHERE \"OriginalAudioName\" = '';");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Tracks_Source_ExternalId",
+                table: "Tracks",
+                columns: new[] { "Source", "ExternalId" },
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_Tracks_Source_ExternalId",
+                table: "Tracks");
+
+            migrationBuilder.AlterColumn<string>(
+                name: "OriginalPictureName",
+                table: "Tracks",
+                type: "character varying(64)",
+                maxLength: 64,
+                nullable: false,
+                defaultValue: "",
+                oldClrType: typeof(string),
+                oldType: "character varying(64)",
+                oldMaxLength: 64,
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "OriginalAudioName",
+                table: "Tracks",
+                type: "character varying(64)",
+                maxLength: 64,
+                nullable: false,
+                defaultValue: "",
+                oldClrType: typeof(string),
+                oldType: "character varying(64)",
+                oldMaxLength: 64,
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "ExternalId",
+                table: "Tracks",
+                type: "character varying(16)",
+                maxLength: 16,
+                nullable: false,
+                defaultValue: "",
+                oldClrType: typeof(string),
+                oldType: "character varying(16)",
+                oldMaxLength: 16,
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "Artist",
+                table: "Tracks",
+                type: "character varying(200)",
+                maxLength: 200,
+                nullable: false,
+                defaultValue: "",
+                oldClrType: typeof(string),
+                oldType: "character varying(200)",
+                oldMaxLength: 200,
+                oldNullable: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Tracks_Source_ExternalId",
+                table: "Tracks",
+                columns: new[] { "Source", "ExternalId" },
+                unique: true,
+                filter: "\"ExternalId\" <> ''");
+        }
+    }
+}