public static void sendUnkwnNote(String to, String msg, String from) throws SQLException {
        Connection con = DatabaseConnection.getConnection();
        PreparedStatement ps = con.prepareStatement("INSERT INTO notes (`to`, `from`, `message`, `timestamp`) VALUES (?, ?, ?, ?)");
        ps.setString(1, to);
        ps.setString(2, from);
        ps.setString(3, msg);
        ps.setLong(4, System.currentTimeMillis());
        ps.executeUpdate();
        ps.close();
    }