flew2bits

using Marten;
using Marten.Events.Projections;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

var builder = Host.CreateApplicationBuilder();
builder.Services.AddMarten(opt => {
    opt.Connection(builder.Configuration.GetConnectionString("Marten") ?? "Host=localhost; Port=5433; User Id=postgres; Password=pgsql");
    opt.Projections.Add<WorkByDayProjection>(ProjectionLifecycle.Inline);

flew2bits

public record MyCommand([property: Identity] Guid Id, string SomeValue);

[AttributeUsage(AttributeTargets.Method)]
public class MyAttribute: Attribute {
  public MyAttribute(string something) => Something = something;
  
  public string Something {get;}
}

public static class MyCommandHandler {