urfatBro/app/common/defaults/db/Migrate.php

<?php

use Schema\Wrapper as Wrapper;
use App\Core\Sanity\MigratorController as Migrator;

function common_defaults_upgrade($pluginversion) {
    if ($pluginversion < "0.0.1") {
        $table = Wrapper::get_table("common_system_defaults");
        $table->addColumn("module", "string", Array("null" => true));
        $table->addColumn("table",  "string", Array("null" => true));
        $table->addColumn("key",    "string", Array("null" => false));
        $table->addColumn("value",  "string", Array("null" => false));        
        $table->create();

        $table = Wrapper::get_table("common_user_defaults");
        $table->addColumn("user_id", "integer", Array("null" => false));
        $table->addColumn("module",  "string",  Array("null" => true));
        $table->addColumn("table",   "string",  Array("null" => true));
        $table->addColumn("key",     "string",  Array("null" => false));
        $table->addColumn("value",   "string",  Array("null" => false));
        $table->addForeignKey('user_id',   Wrapper::get_table('core_auth_user'));

        Migrator::getInstance()->update_plugin_version("common_defaults", "1.0.0");
        return;
    }

    //if ($pluginversion < "0.0.2") {
        //$table = Wrapper::get_table("common_defaultss");
        //Migrator::getInstance()->update_plugin_version("common_defaults", "1.0.1");
        //return;
    //}
}

function common_defaults_rollback($pluginversion) {
    if($pluginversion > "0.0.1"){
        $table = Wrapper::get_table("common_defaultss");
        $table->drop();
        return;
    }
}