Refactor
Guess the type of environment variables
Inline cache key
Fix bug where changes in series info don't purge the cache
Change DB column types from Text to String
Use MySQL instead of PostgreSQL

It seems bad to include deployment-specific packages in
requirements.txt, but Heroku needs them... What should I do?
Update the fetched time ASAP early to prevent duplicate requests
Fix bug where index view cache is not purged
Fix bug where new series have insufficient data
Increase request frequency at the peak hours
Remove unused import joinedload
Avoid redefining built-in 'object'
Avoid redefining name 'datetime'
Refactor by spliting a big function into small functions
Refactor
Unwrap not-too-long lines to improve readability
Allow NAVERWEBTOONFEEDS_SETTINGS to be optional
Improve comments and reorder config values by priority
Split resetdb into db_create_all and db_drop_all
Stop using Flask-Evolution

It doesn't support assuming migrated for a fresh database.