* Add specs for single article functionality
* Add single article functionality
* Use article_id instead of single_article_id
* Add published: true when querying for one article
* Use article_id in specs oops
* Add basic tests for Analytics service
* User/Organization are always required
* Add some data to the test
* Use queries and date times
* Fix AnalyticsService interface in the controller
* s/HTTP_API_KEY/api-key
* Defend against nils and support datetime objects
* Update app/services/analytics_service.rb
Co-Authored-By: rhymes <rhymesete@gmail.com>
* Use SQL sum, not Rails sum
* Group average_read_time
* Use SQL, not Rails
* Use ISO date
* Fix specs
