class YourDbContext
{
    private readonly string _connectionString;
    
    internal virtual DbSet<UrDbClass> YourTableClass{ get; set; } //cool, no plublic table access
    
    public YourDbContext(string connectionString) : base()
    {
        _connectionString = connectionString;
    }
        
    public YourDbContext(DbContextOptions<ProductDesignContext> options) //needed for Ef Core reverse .. an so one
        : base(options)
    {
            
    }
    
    //and now.. we pass the connection string in the OnConfigure proc
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        if (!optionsBuilder.IsConfigured)
        {
            //#warning To protect potentially sensitive information in your connection string, you should move it out of source code. You can avoid scaffolding the connection string by using the Name= syntax to read it from configuration - see https://go.microsoft.com/fwlink/?linkid=2131148. For more guidance on storing connection strings, see http://go.microsoft.com/fwlink/?LinkId=723263.
            //optionsBuilder.UseNpgsql("ConnectionString needed for Ef Core.. and plese dont use hard coded string ;)");
            optionsBuilder.UseNpgsql( _connectionString );
        }
    }
}