static async importSQLFile(filename) {
        // Sadly, multi sql statements is not supported by many sqlite libraries, I have to implement it myself
        await R.getCell("SELECT 1");

        let text = fs.readFileSync(filename).toString();

        // Remove all comments (--)
        let lines = text.split("\n");
        lines = lines.filter((line) => {
            return ! line.startsWith("--");
        });

        // Split statements by semicolon
        // Filter out empty line
        text = lines.join("\n");

        let statements = text.split(";")
            .map((statement) => {
                return statement.trim();
            })
            .filter((statement) => {
                return statement !== "";
            });

        for (let statement of statements) {
            await R.exec(statement);
        }
    }
Load an SQL file and execute it
@param {string} filename Filename of SQL file to import
@returns {Promise<void>}