Govor/Govor.Data/Configurations/GroupMembershipConfiguration.cs

using Govor.Core.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace Govor.Data.Configurations;

public class GroupMembershipConfiguration : IEntityTypeConfiguration<GroupMembership>
{
    public void Configure(EntityTypeBuilder<GroupMembership> builder)
    {
        builder.HasKey(m => new { m.GroupId, m.UserId });
    }
}