Use Marten

_init

dotnet add package Marten

Configure.Marten.cs

using System.Collections.Generic;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using ServiceStack;
using Marten;

namespace MyApp
{
    public class ConfigureMarten : IConfigureServices
    {
        public static List<Action<StoreOptions>> Options { get; } = new List<Action<StoreOptions>>();

        IConfiguration Configuration { get; }
        public ConfigureDb(IConfiguration configuration) => Configuration = configuration;

        public void Configure(IServiceCollection services)
        {
            var store = DocumentStore.For(opts =>
            {
                opts.Connection(Configuration.GetConnectionString("Marten") 
                    ?? "host=localhost;username=test;password=test;database=marten");

                Options.ForEach(fn => fn(opts));
            });
            store.Advanced.Clean.CompletelyRemoveAll();
            services.AddSingleton<IDocumentStore>(store);
        }
    }    
}

@Lippur updated now, thx!

Another thing, line 23 throws an error because of the way the Options property is typed. The list on line 11 should probably be typed as List<Action<StoreOptions>> instead.

@Lippur Updated thx 👍