Auto-set CreatedAt/UpdatedAt via EF interceptor; standardize timestamp names across entities

Application/PlayLists/Handlers/GetPlayListsByUserIdQueryHandler.cs

@@ -27,7 +27,7 @@ namespace Musify.Application.PlayLists.Handlers
             var totalCount = await playListsQuery.CountAsync(cancellationToken);
 
             var pagedPlayLists = await playListsQuery
-                .OrderBy(p => p.CreatedDate)
+                .OrderBy(p => p.CreatedAt)
                 .Select(p => PlayListApplicationResponse.FromEntity(p))
                 .ToPagedListAsync(request.PageNumber, request.PageSize, totalCount, cancellationToken);
 

Application/PlayLists/Responses/PlayListApplicationResponse.cs

@@ -21,8 +21,8 @@ namespace Musify.Application.PlayLists.Responses
                 playList.SmallPictureName,
                 playList.MediumPictureName,
                 playList.LargePictureName,
-                playList.CreatedDate,
-                playList.UpdatedDate);
+                playList.CreatedAt,
+                playList.UpdatedAt);
         }
     }
 }

Application/Tracks/Handlers/GetTracksByUserIdQueryHandler.cs

@@ -31,7 +31,7 @@ namespace Musify.Application.Tracks.Handlers
             var totalCount = await tracksQuery.CountAsync(cancellationToken);
 
             var pagedTracks = await tracksQuery
-                .OrderBy(t => t.Track.CreatedDate)
+                .OrderBy(t => t.Track.CreatedAt)
                 .Select(t => TrackApplicationResponse.FromEntity(t.Track))
                 .ToPagedListAsync(pageNumber, pageSize, totalCount, cancellationToken);
 

Application/Tracks/Responses/TrackApplicationResponse.cs

@@ -5,16 +5,16 @@ namespace Musify.Application.Tracks.Responses
     public record TrackApplicationResponse(
         Guid Id,
         string Title,
-        DateTime CreatedDate,
-        DateTime UpdatedDate)
+        DateTime CreatedAt,
+        DateTime UpdatedAt)
     {
         public static TrackApplicationResponse FromEntity(Track track)
         {
             return new TrackApplicationResponse(
                 track.Id,
                 track.Title,
-                track.CreatedDate,
-                track.UpdatedDate);
+                track.CreatedAt,
+                track.UpdatedAt);
         }
     }
 }

Application/Users/Handlers/SyncUserCommandHandler.cs

@@ -63,7 +63,6 @@ namespace Musify.Application.Users.Handlers
 
             if (hasChanges)
             {
-                user.UpdatedAt = DateTime.UtcNow;
                 await database.SaveChangesAsync(cancellationToken);
                 logger.LogInformation("Synced profile for user {UserId}", request.Id);
             }