private function check_tables() {
		$tab = new AdminStoreTables();
		$tab::init($this);
		$force = $this->force_create_table;
		if ($tab::exists($force)) {
			if (!$force)
				$tab::upgrade();
			$tab::deinit();
			return;
		}
		$tab::install($this->expiration);
		$tab::deinit();
	}