Authenticate cookie against encrypted database

[lajh87]

• [x] Write mysql schema
• [ ] Write server code

[lajh87]

CREATE TABLE auth_tokens ( id integer(11) not null UNSIGNED AUTO_INCREMENT, selector char(12), hashedValidator char(64), userid integer(11) not null UNSIGNED, expires datetime, PRIMARY KEY (id) );

https://paragonie.com/blog/2015/04/secure-authentication-php-with-long-term-persistence