Fired when the moving is finished (the column is dropped at the target position), after the column is actually moved.
DayPilot.Kanban.onColumnMoved(args);
The source data object is accessible as args.column.data.
<div id="dp"></div>
<script type="text/javascript">
    var dp = new DayPilot.Kanban("dp");
    
    // ...
    dp.columnMoveHandling = "Update";
    dp.onColumnMoved = function(args) {
      dp.message("Column " + args.column.data.name + " was moved.");
    };
    dp.init();
</script>