Trying to edit client side table - identifier issue

I have a simple table created in HTML with three columns, none of which are suitable to be used as a primary key. I gather from the technical note that I need to have a primary key column specified to be able to edit. How do I do this in a pure client side app where I am just working with a table in Javascript? Do I need to create a hidden column or something, and then somehow automatically populate it when loading and when adding new rows?

    editor = new $.fn.dataTable.Editor({
        table: "#example",
        fields: [{
            label: "Goal:",
            name: "goal"
        }, {
            label: "Action Step:",
            name: "action_step"
        }, {
            label: "Start date:",
            name: "start_date",
            type: "datetime"
        }]
    });

    $('#example').DataTable( {
        dom: "Bfti",
        "paging": false,
        "order": [[ 2, "asc" ]],
        columns: [
            { data: "goal" },
            { data: "action_step" },
            { data: "start_date" }
        ],
        select: true,
        buttons: [
            { extend: "create", editor: editor },
            { extend: "edit",   editor: editor },
            { extend: "remove", editor: editor }
        ]
    });

        <table id="example" class="table table-striped table-bordered display" cellspacing="0" width="100%">
                <thead>
                    <tr>
                        <th>Goal</th>
                        <th>Action Step</th>
                        <th>Start date</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>Success</td>
                        <td>Get success first</td>
                        <td>2010/04/25</td>
                    </tr>
                    <tr>
                        <td>Success</td>
                        <td>Get success</td>
                        <td>2011/04/25</td>
                    </tr>
                    <tr>
                        <td>Success</td>
                        <td>Get success at last</td>
                        <td>2012/04/25</td>
                    </tr>
                    <tr>
                        <td>Success</td>
                        <td>Get success</td>
                        <td>2011/04/25</td>
                    </tr>
                </tbody>
            </table>