Hello!

I think your structure is not good enough. You may use
cookie-based database selection instead and doesn't
store user information into your "Master DB". 

The algorithm is like to:
Username -> user_id -> check password by user_id database

As example:
User enter USERNAME and PASSWORD and we check
PASSWORD in database file md5(USERNAME).db

You may block brutforces in your application. For valid users
performance is usually fine by this schema.

P.S. For javascript auto-complete of user names is possible
to build list of usernames periodically.

Best regards, Alexey Pechnikov.
http://pechnikov.tel/
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