Audit Interceptor

public sealed class AuditInterceptor : SaveChangesInterceptor
{
    private readonly IAuditUserContext _userContext;

    public AuditInterceptor(IAuditUserContext userContext) => _userContext = userContext;
    // ...
}

public override ValueTask<InterceptionResult<int>> SavingChangesAsync(
    DbContextEventData eventData, InterceptionResult<int> result,
    CancellationToken cancellationToken = default)
{
    if (eventData.Context is not null)
        ApplyAuditFields(eventData.Context);

    return base.SavingChangesAsync(eventData, result, cancellationToken);
}

private void ApplyAuditFields(DbContext context)
{
    var now    = DateTime.UtcNow;
    var userId = _userContext.UserId;

    foreach (var entry in context.ChangeTracker.Entries<EntityBase>())
    {
        switch (entry.State)
        {
            case EntityState.Added:
                entry.Property(nameof(IAuditableEntity.CreatedAt)).CurrentValue = now;
                entry.Property(nameof(IAuditableEntity.CreatedBy)).CurrentValue = userId;
                break;

            case EntityState.Modified:
                entry.Property(nameof(IAuditableEntity.UpdatedAt)).CurrentValue = now;
                entry.Property(nameof(IAuditableEntity.UpdatedBy)).CurrentValue = userId;
                break;

            case EntityState.Deleted:
                // Fiziksel silme yerine soft-delete
                entry.State = EntityState.Modified;
                entry.Property(nameof(ISoftDeletable.DeletedAt)).CurrentValue = now;
                entry.Property(nameof(ISoftDeletable.DeletedBy)).CurrentValue = userId;
                break;
        }
    }
}

public interface IAuditUserContext
{
    Guid UserId { get; }
}

class NoAuditUserContext : IAuditUserContext
{
    public Guid UserId => SystemActor.Id;
}

// DependencyInjection.cs
services.AddScoped<AuditInterceptor>();   // scoped — her request'te taze IAuditUserContext

services.AddDbContext<DiyanetCleanArchitectureDbContext>((sp, options) =>
{
    options.UseNpgsql(...).UseSnakeCaseNamingConvention();
    // AuditInterceptor scoped olduğu için buraya EKLENMIYOR.
});

// DiyanetCleanArchitectureDbContext.cs
public DiyanetCleanArchitectureDbContext(
    DbContextOptions<DiyanetCleanArchitectureDbContext> options,
    IMediator mediator, IEventBus eventBus, AuditInterceptor auditInterceptor) : base(options)
{
    _auditInterceptor = auditInterceptor ?? throw new ArgumentNullException(nameof(auditInterceptor));
    // ...
}

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
    if (_auditInterceptor != null)
        optionsBuilder.AddInterceptors(_auditInterceptor);

    base.OnConfiguring(optionsBuilder);
}