facturation/upgrade.php

<?php

namespace Garradin;

$db = DB::getInstance();
$db->import(dirname(__FILE__) . "/data/schema.sql");

$r = (array) DB::getInstance()->get('SELECT * FROM plugin_facturation_factures');

foreach ($r as $e) {
    $e->contenu =json_encode(unserialize((string) $e->contenu));
    $db->update('plugin_facturation_factures', $e, $db->where('id', (int)$e->id));
}