async initDBAfterStarted() {
        const connection = mysql.createConnection({
            socketPath: this.socketPath,
            user: this.username,
        });

        let result = await connection.execute("CREATE DATABASE IF NOT EXISTS `kuma`");
        log.debug("mariadb", "CREATE DATABASE: " + JSON.stringify(result));

        log.info("mariadb", "Embedded MariaDB is ready for connections");
        this.started = true;
    }
Initialise the "kuma" database in mariadb if it does not exist
@returns {Promise<void>}