public static function get_all_models($enabled = false, $trained = false, $predictioncontext = false) {
        global $DB;

        $params = array();

        $sql = "SELECT am.* FROM {analytics_models} am";

        if ($enabled || $trained || $predictioncontext) {
            $conditions = [];
            if ($enabled) {
                $conditions[] = 'am.enabled = :enabled';
                $params['enabled'] = 1;
            }
            if ($trained) {
                $conditions[] = 'am.trained = :trained';
                $params['trained'] = 1;
            }
            if ($predictioncontext) {
                $conditions[] = "EXISTS (SELECT 'x'
                                           FROM {analytics_predictions} ap
                                          WHERE ap.modelid = am.id AND ap.contextid = :contextid)";
                $params['contextid'] = $predictioncontext->id;
            }
            $sql .= ' WHERE ' . implode(' AND ', $conditions);
        }
        $sql .= ' ORDER BY am.enabled DESC, am.timemodified DESC';

        $modelobjs = $DB->get_records_sql($sql, $params);

        $models = array();
        foreach ($modelobjs as $modelobj) {
            $model = new \core_analytics\model($modelobj);
            if ($model->is_available()) {
                $models[$modelobj->id] = $model;
            }
        }
        return $models;
    }