Program.cs

using Microsoft.EntityFrameworkCore;
using TodoApi.Data;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllers();

builder.Services.AddDbContext<TodoDbContext>(opt =>
    opt.UseNpgsql(builder.Configuration.GetConnectionString("TodoDbConnection")));
builder.Services.AddDbContext<TodoDbReadContext>(opt =>
    opt.UseNpgsql(builder.Configuration.GetConnectionString("TodoDbConnectionRead")));

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseAuthorization();
app.MapControllers();

if (app.Environment.IsDevelopment())
{
    app.Run("http://localhost:5001");
}
else
{
    app.UseHttpsRedirection();
    app.Run();
}