You can easily tell the search engine to skip this web page (<meta name="robots" content="noindex" />) + a small change in robots.txt I think. Make it offline if you are the only one to see it, why would you expose your database to hackers? If you absolutely want it Online, I suggest you to hire a security guru if you don't know anything in security.
You can also try paper, it's the most secure way to store data
. Anyway, good luck sir.