Implement a database to store users

[christhomas]

There is a Database Authenticator. This should login a user against the user table and generate a token to use in future subrequests (for example php->metadata).

I need to create the following:

• a database table: users
• a token table: tokens
• a token service to write new tokens
• rename endpoint /auth -> /login

[christhomas]

I have the various database tables required to properly manage users

• repository types: so credentials can be targetting at particular repositories (a user could have the same login details for npm, php)
• package groups: so users can be given access to different groups of packages depending on their status: [public, sales, marketing, user@email.com] could all be valid groups
• users: the actual credentials for this user
• user package groups: associating a user with a package group gives them access to the packages inside that group
• tokens: when a user logs in, a token is returned which is used for checking validatity of a user login

I don't have the service to write the tokens, I'm going to split that into a separate task

I did rename the endpoint /auth -> /user/login