Beginning of the port to PostgreSQL.
Added database initialisation script.
Create and edit a feed: OK.
Added decorator to check if a user has access to a feed.
Management page near to be OK.
Sort articles by date.
Fixed /feeds template.
Fixed /feeds template (2).
Improved articles loading for the home page.
Mark all articles (or all articles from a feed) as read.
Fix.
Like/unlike articles.
Delete an article.
/articles page is working.
/unread and /like views are working.
Another view is fixed.
Update requirements.txt file.
Import/export of feeds with OPML is working.