Database upgrade

[drusepth]

I created a Premium-2 Heroku database following the production Premium-0 database.

This is the script to run tonight to finalize the upgrade:

• [x] Turn on maintenance mode:

  heroku maintenance:on -a production-1

• [x] Unfollow the current production database

  heroku pg:unfollow HEROKU_POSTGRESQL_RED_URL -a production-1

• [x] Promote the new database to be the primary database used by production

  heroku pg:promote HEROKU_POSTGRESQL_RED -a production-1

• [x] Verify that the environment DATABASE_URL now points to HEROKU_POSTGRESQL_RED_URL

  heroku config -a production-1
  heroku pg:info -a production-1

• [x] Restart all dynos for changes to take effect

  heroku dynos:restart -a production-1

• [x] Disable maintenance mode

  heroku maintenance:off -a production-1

We should probably keep the old database around for a few days for safety, but also verify that it remains at zero connections and zero writes during that time.

[drusepth]

@heydonovan Sanity check this process? :)

[drusepth]

Done & live.