feat: add timestamp interceptor and infrastructure service registration

src/FiscalOS.Infra/Data/TimestampInterceptor.cs

@@ -0,0 +1,42 @@
+using FiscalOS.Core.Data;
+
+namespace FiscalOS.Infra.Data;
+
+internal sealed class TimestampInterceptor : SaveChangesInterceptor
+{
+  public override InterceptionResult<int> SavingChanges(DbContextEventData eventData, InterceptionResult<int> result)
+  {
+    UpdateEntities(eventData.Context);
+    return base.SavingChanges(eventData, result);
+  }
+
+  public override ValueTask<InterceptionResult<int>> SavingChangesAsync(DbContextEventData eventData, InterceptionResult<int> result, CancellationToken cancellationToken = default)
+  {
+    UpdateEntities(eventData.Context);
+    return base.SavingChangesAsync(eventData, result, cancellationToken);
+  }
+
+  private static void UpdateEntities(DbContext? context)
+  {
+    if (context is null)
+    {
+      return;
+    }
+
+    var entries = context.ChangeTracker
+      .Entries<Entity>()
+      .Where(static e => e.State is EntityState.Added or EntityState.Modified);
+
+    var utcNow = DateTimeOffset.UtcNow;
+
+    foreach (var entry in entries)
+    {
+      if (entry.State == EntityState.Added)
+      {
+        entry.Entity.SetCreatedAt(utcNow);
+      }
+
+      entry.Entity.SetUpdatedAt(utcNow);
+    }
+  }
+}

src/FiscalOS.Infra/DependencyInjection/ServiceCollectionExtensions.cs

@@ -0,0 +1,13 @@
+namespace FiscalOS.Infra.DependencyInjection;
+
+public static class ServiceCollectionExtensions
+{
+  public static IServiceCollection AddInfrastructure(this IServiceCollection services)
+  {
+    services.AddSingleton<IPasswordHasher, PasswordHasher>(static (_) => PasswordHasher.New());
+    services.ConfigureOptions<AppDbContextOptionsSetup>();
+    services.AddDbContext<AppDbContext>();
+    services.AddHostedService<MigrationService>();
+    return services;
+  }
+}