CN-1674

<div>
    <h4>Usage in models</h4>
    <div>course_event_positions, ec_event_positions</div>

    <h4>Structure</h4>
    <div class="tabs">
        <a onclick="selectTab(this);" class="tabs-active">JSON</a>
        <a onclick="selectTab(this);">Table</a>
                <div class="tabs-active"><div class='code'>{<div class='tab'><div class='comment'>// <strong><a name='CourseEventPositions.id.json'></a>Row ID</strong></div><div>id : ID,</div><div class='comment'>// <strong><a name='CourseEventPositions.event_id.json'></a>Event ID</strong></div><div>event_id : ID = <a href='#Event.id.json' class='field-link'>Event.id</a>,</div><div class='comment'>// <strong><a name='CourseEventPositions.position_id.json'></a>Position ID</strong></div><div>position_id : ID = <a href='#Position.id.json' class='field-link'>Position.id</a>,</div><div class='comment'>// <strong><a name='CourseEventPositions.cap.json'></a>Course position capacity</strong></div><div>cap : Integer|null,</div><div class='comment'>// <strong><a name='CourseEventPositions.candidates_count.json'></a>Candidates count on course position</strong></div><div>candidates_count : Integer|null,</div></div>}</div></div>
        <div><table border='1' style='border-collapse: collapse;'>
                <thead>
                <tr>
                    <th>Field</th>
                    <th>Format/hooks</th>
                    <th>Description</th>
                    <th>Other</th>
                </tr>
                </thead>
                <tbody>
                    <tr>
                <td><a name='CourseEventPositions.id.table'></a>id</td>
                <td>ID</td>
                <td>Row ID</td>
                <td></td>
            </tr><tr>
                <td><a name='CourseEventPositions.event_id.table'></a>event_id</td>
                <td>ID</td>
                <td>Event ID</td>
                <td><div>= <a href='#Event.id.table' class='field-link'>Event.id</a></div></td>
            </tr><tr>
                <td><a name='CourseEventPositions.position_id.table'></a>position_id</td>
                <td>ID</td>
                <td>Position ID</td>
                <td><div>= <a href='#Position.id.table' class='field-link'>Position.id</a></div></td>
            </tr><tr>
                <td><a name='CourseEventPositions.cap.table'></a>cap</td>
                <td>Integer|null</td>
                <td>Course position capacity</td>
                <td></td>
            </tr><tr>
                <td><a name='CourseEventPositions.candidates_count.table'></a>candidates_count</td>
                <td>Integer|null</td>
                <td>Candidates count on course position</td>
                <td></td>
            </tr>
                </tbody>
            </table></div>
    </div>

        <h4 class="hidden">Saver links tree</h4>
    <div style="display: none;">

                <h5>Create/update</h5>
        <div>
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