Clean up domain entities: shared picture value object, lifecycle and ownership interfaces, explicit tables

backend/Core/Musify.Application/PlayLists/AddTrackToPlayList.cs

@@ -24,7 +24,7 @@ public class AddTrackToPlayListCommandHandler(
         if (playList == null)
             return AppErrors.NotFound("PlayList", request.PlayListId);
 
-        if (playList.UserId != request.UserId)
+        if (playList.OwnerUserId != request.UserId)
             return AppErrors.Forbidden("PlayList", request.PlayListId);
 
         var trackExists = await database.Tracks

backend/Core/Musify.Application/PlayLists/CreatePlayList.cs

@@ -17,7 +17,7 @@ public record CreatePlayListCommand(
     string Name,
     string? Description,
     Guid? PictureIntentId,
-    PlaylistVisibility Visibility = PlaylistVisibility.Private)
+    PlayListVisibility Visibility = PlayListVisibility.Private)
     : ICommand<ErrorOr<PlayListApplicationResponse>>;
 
 public class CreatePlayListCommandHandler(
@@ -30,7 +30,7 @@ public class CreatePlayListCommandHandler(
     UploadIntentConfiguration uploadIntentConfiguration)
     : ICommandHandler<CreatePlayListCommand, ErrorOr<PlayListApplicationResponse>>
 {
-    private sealed record ResolvedPlayListPictures(PlayListPictures? Pictures, UploadIntent? Intent);
+    private sealed record ResolvedPlayListPictures(EntityPictures? Pictures, UploadIntent? Intent);
 
     public async ValueTask<ErrorOr<PlayListApplicationResponse>> Handle(CreatePlayListCommand request, CancellationToken cancellationToken)
     {
@@ -51,7 +51,7 @@ public class CreatePlayListCommandHandler(
 
         var playList = new PlayList
         {
-            UserId = request.UserId,
+            OwnerUserId = request.UserId,
             Name = request.Name.Trim(),
             NormalizedName = request.Name.Trim().ToUpperInvariant(),
             Description = string.IsNullOrWhiteSpace(request.Description) ? null : request.Description.Trim(),
@@ -96,7 +96,7 @@ public class CreatePlayListCommandHandler(
         if (validation.IsError)
             return validation.Errors;
 
-        return new ResolvedPlayListPictures(PlayListPictures.Pending(validation.Value.ObjectName), validation.Value);
+        return new ResolvedPlayListPictures(EntityPictures.Pending(validation.Value.ObjectName), validation.Value);
     }
 
     private async Task<ErrorOr<Success>> PublishCreatePlayListEventAsync(

backend/Core/Musify.Application/PlayLists/DeletePlayList.cs

@@ -27,7 +27,7 @@ public class DeletePlayListCommandHandler(
             return Error.NotFound();
         }
 
-        if (playList.UserId != request.UserId)
+        if (playList.OwnerUserId != request.UserId)
         {
             logger.LogWarning("Playlist {PlayListId} does not belong to user {UserId}", request.PlayListId, request.UserId);
             return AppErrors.Forbidden("PlayList", request.PlayListId);

backend/Core/Musify.Application/PlayLists/GetPlayListById.cs

@@ -32,8 +32,8 @@ public class GetPlayListByIdQueryHandler(IDatabase database)
         if (entry == null)
             return Error.NotFound();
 
-        if (entry.PlayList.Visibility == PlaylistVisibility.Private
-            && entry.PlayList.UserId != request.RequestingUserId)
+        if (entry.PlayList.Visibility == PlayListVisibility.Private
+            && entry.PlayList.OwnerUserId != request.RequestingUserId)
         {
             return Error.NotFound();
         }

backend/Core/Musify.Application/PlayLists/GetPlayListCover.cs

@@ -24,7 +24,7 @@ public class GetPlayListCoverQueryHandler(
     {
         var owned = await database.PlayLists.AsNoTracking()
             .Where(e => e.Id == request.PlayListId && e.LifeCycleStatus == LifeCycleStatus.Active)
-            .Select(e => new { OwnerUserId = e.UserId, e.Pictures })
+            .Select(e => new { OwnerUserId = e.OwnerUserId, e.Pictures })
             .SingleOrDefaultAsync(cancellationToken);
 
         if (owned?.Pictures == null)

backend/Core/Musify.Application/PlayLists/GetPlayListTracks.cs

@@ -27,7 +27,7 @@ public class GetPlayListTracksQueryHandler(IDatabase database)
             .AnyAsync(
                 p => p.Id == request.PlayListId
                     && p.LifeCycleStatus == LifeCycleStatus.Active
-                    && (p.Visibility == PlaylistVisibility.Public || p.UserId == request.ViewerId),
+                    && (p.Visibility == PlayListVisibility.Public || p.OwnerUserId == request.ViewerId),
                 cancellationToken);
         if (!playListExists)
             return Error.NotFound();

backend/Core/Musify.Application/PlayLists/GetPlayListsByUserId.cs

@@ -25,9 +25,9 @@ public class GetPlayListsByUserIdQueryHandler(IDatabase database)
     {
         var playListsQuery = database.PlayLists
             .AsNoTracking()
-            .Where(p => p.UserId == request.UserId
+            .Where(p => p.OwnerUserId == request.UserId
                 && p.LifeCycleStatus == LifeCycleStatus.Active
-                && (p.Visibility == PlaylistVisibility.Public || p.UserId == request.ViewerId));
+                && (p.Visibility == PlayListVisibility.Public || p.OwnerUserId == request.ViewerId));
 
         if (!string.IsNullOrEmpty(request.Name))
         {

backend/Core/Musify.Application/PlayLists/RemoveTrackFromPlayList.cs

@@ -23,7 +23,7 @@ public class RemoveTrackFromPlayListCommandHandler(
         if (playList == null)
             return AppErrors.NotFound("PlayList", request.PlayListId);
 
-        if (playList.UserId != request.UserId)
+        if (playList.OwnerUserId != request.UserId)
             return AppErrors.Forbidden("PlayList", request.PlayListId);
 
         var playListTracks = await database.PlayListHasTracks

backend/Core/Musify.Application/PlayLists/Responses/PlayListApplicationResponse.cs

@@ -10,7 +10,7 @@ public record PlayListApplicationResponse(
     string? SmallImageKeyName,
     string? MediumImageKeyName,
     string? LargeImageKeyName,
-    PlaylistVisibility Visibility,
+    PlayListVisibility Visibility,
     DateTime CreatedAt,
     DateTime UpdatedAt,
     IReadOnlyList<Guid> CoverTrackIds)

backend/Core/Musify.Application/PlayLists/UpdatePlayList.cs

@@ -19,7 +19,7 @@ public record UpdatePlayListCommand(
     string? NewName,
     string? NewDescription,
     Guid? NewPictureIntentId,
-    PlaylistVisibility? NewVisibility = null)
+    PlayListVisibility? NewVisibility = null)
     : ICommand<ErrorOr<PlayListApplicationResponse>>;
 
 public class UpdatePlayListCommandHandler(
@@ -41,7 +41,7 @@ public class UpdatePlayListCommandHandler(
             return Error.NotFound();
         }
 
-        if (playListEntity.UserId != request.UserId)
+        if (playListEntity.OwnerUserId != request.UserId)
         {
             logger.LogWarning("User {UserId} is not the owner of playlist {PlayListId}", request.UserId, request.PlayListId);
             return AppErrors.Forbidden("PlayList", request.PlayListId);
@@ -72,7 +72,7 @@ public class UpdatePlayListCommandHandler(
                 return validation.Errors;
 
             var pictureIntent = validation.Value;
-            playListEntity.Pictures = PlayListPictures.Pending(pictureIntent.ObjectName);
+            playListEntity.Pictures = EntityPictures.Pending(pictureIntent.ObjectName);
             var finalPictureKey = playListConfiguration.Routes.BuildOriginalPicturePath(request.UserId, pictureIntent.ObjectName);
 
             var publishResult = await PublishUpdatePlayListPictureSourceEventAsync(