web: sessions#create: use User#create_or_update_bulk_from_json
app: update spec of Favorite
app: update spec of Retweet
collector: transaction is not needed to flush events
collector: defer flushing
collector: don't defer
web: use friends/ids to get follow relation
app: Account#friends: use Set instead of Array
web: tweets#*: use authorized_to_show? for favoriter icon
web: view: tweets/_tweet_stats: always show favoriter icon for current_user's tweets even if not following
web: tweets#filter: remove .reacted condition
web: remove tweets#user_discoveries and tweets#user_discovered_by and create tweets#user_favorites and tweets#user_favorited_by.
web: tweets#user_favorites: order by favorites_id, paginating with page number
api: deprecate api/tweets/user_discover*