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var table = $Database.Get({
    Parameters : {
        TargetSchema : 'HR',
        TargetTable : 'Groups'
    }
});

var list = table.ToDictionary('Name');

var myGroup = list.Ensure("MyGroup", {
    Name : 'MyGroup',
    Code : '123'
}, {
    Id : Script.NewId()
});

list.Save();