backend/Core/Musify.Infrastructure/Persistence/AuditableEntityInterceptor.cs

@@ -37,7 +37,7 @@ namespace Musify.Infrastructure.Persistence
                 }
                 else if (entry.State == EntityState.Modified)
                 {
-                    entry.Entity.UpdatedAt = now;
+                    entry.Property(nameof(IAuditable.UpdatedAt)).CurrentValue = now;
                 }
             }
         }

backend/Core/Musify.Infrastructure/Persistence/Database.cs

@@ -13,9 +13,13 @@ namespace Musify.Infrastructure.Persistence
     public class Database(DatabaseConfiguration configuration)
         : DbContext, AppIDatabase
     {
+        private static readonly AuditableEntityInterceptor AuditInterceptor = new();
+
         protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
         {
-            optionsBuilder.UseNpgsql(configuration.ConnectionString, o => o.MapEnum<Genre>("genre"));
+            optionsBuilder
+                .UseNpgsql(configuration.ConnectionString, o => o.MapEnum<Genre>("genre"))
+                .AddInterceptors(AuditInterceptor);
         }
 
         protected override void OnModelCreating(ModelBuilder modelBuilder)

backend/Core/Musify.Infrastructure/Persistence/DatabaseDependencyInjection.cs

@@ -18,10 +18,7 @@ namespace Musify.Infrastructure.Persistence
             serviceDescriptors.AddSingleton(serviceProvider =>
                 serviceProvider.GetRequiredService<IOptions<DatabaseConfiguration>>().Value);
 
-            serviceDescriptors.AddSingleton<AuditableEntityInterceptor>();
+            serviceDescriptors.AddDbContext<Database>();
-
-            serviceDescriptors.AddDbContext<Database>((serviceProvider, options) =>
-                options.AddInterceptors(serviceProvider.GetRequiredService<AuditableEntityInterceptor>()));
 
             serviceDescriptors.AddScoped<IDatabase>(serviceProvider => serviceProvider.GetRequiredService<Database>());
 

backend/Tests/Musify.Infrastructure.Tests/Persistence/AuditableEntityInterceptorTests.cs

@@ -1,3 +1,4 @@
+using Microsoft.EntityFrameworkCore;
 using Musify.Domain.Entities;
 using Musify.Infrastructure.Tests.TestSupport;
 using Xunit;
@@ -43,6 +44,11 @@ namespace Musify.Infrastructure.Tests.Persistence
             Assert.Equal(originalCreatedAt, user.CreatedAt);
             Assert.True(user.UpdatedAt > originalCreatedAt,
                 $"original-created-at={originalCreatedAt:O}, final-updated-at={user.UpdatedAt:O}");
+
+            await using var reader = fixture.CreateDatabase();
+            var stored = await reader.Users.SingleAsync(u => u.Id == user.Id, TestContext.Current.CancellationToken);
+            Assert.True(stored.UpdatedAt > stored.CreatedAt,
+                $"stored-created-at={stored.CreatedAt:O}, stored-updated-at={stored.UpdatedAt:O}");
         }
     }
 }