Make weekly endpoint not dependent on cron?

[joereynolds]

Make weekly endpoint actually work with a db to track the last time it was ran and what raga it chose.

Currently it's on a cron but I think I'd prefer if it just "figured out" if it needed to ran again?

Pros:

• Less infrastructure

Cons:

• If nobody visits the site for a year for example. There will be no weeks populated for that length. A cron is reliable