public static WebApplicationBuilder AddDatabaseConnections(this WebApplicationBuilder builder)
    {
        ArgumentNullException.ThrowIfNull(builder);
        
        var connectionString = builder.Configuration.GetConnectionString("mydb");
        Console.WriteLine(connectionString);
        ArgumentException.ThrowIfNullOrEmpty(connectionString);

        builder.Services.AddDbContext<MyDbContext>(opt =>
        {
            opt.UseNpgsql(connectionString);
        });

        return builder;
    }

    public static WebApplicationBuilder AddDatabaseConnections(this WebApplicationBuilder builder)
    {
        ArgumentNullException.ThrowIfNull(builder);
        
        var connectionString = builder.Configuration.GetConnectionString("mydb");
        Console.WriteLine(connectionString);
        ArgumentException.ThrowIfNullOrEmpty(connectionString);

        builder.Services.AddDbContext<MyDbContext>(opt =>
        {
            opt.UseNpgsql(connectionString);
        });

        return builder;
    }