TODO user-images-extract-to-table:
User profile images and banner images => extract to table.  Add `is_downloaded` column.  Add test for double-downloading a user, shouldn't change the write-times on these files

TODO update-all:
For each user in userslist.txt:
- update user
- download new images if necessary
- fetch tweets since last update

TODO implement-search

TODO fetch-older-tweets:
get tweets older than 3200 ago


TODO https://twitter.com/michaelmalice/status/1461031030278742020 => "account no longer exists" tombstone

TODO cleanup-main: The `cmd/twitter/main.go` file is becoming a disaster, it needs a cleanup badly.  lots of copy-pastes that should be functions, code that should be moved to the scraper / persistence modules, etc

TODO broadcast-cards
panic: Unknown card type: 3691233323:periscope_broadcast
panic: Unknown card type: 745291183405076480:broadcast

TODO consecutive-tombstones
Conversation threads with two or more consecutive tombstones don't get scraped correctly

Video size reduction:
- add "bitrate" and "available bitrates" fields
- option to upgrade or downgrade video quality

TODO tombstone updating:
- "Tweet is unavailable" tombstones are not always accurate.  In user feed, they show as "not available" but the real reason is "deleted" etc; should update the tombstone type when fetching the conversation view
- tweet-to-stub: If a tweet is deleted after getting a non-stub version, should still show a tombstone (or a modified one at least)
- stub-to-tweet: If a user un-privates after getting a stub-version (or tweet becomes available for other reasons), stub versions should write the real content and "stub" status should be removed

TODO: Problem tweets
- https://twitter.com/HazardHarringto/status/1481808740445741062: replies not loading
- https://twitter.com/TyCardon/status/1480640777281839106: "Media has been disabled in response to report by copyright owner"
- https://twitter.com/CovfefeAnon/status/1427693931047837702: parent thread not loading (possible GUI problem)
- "account no longer exists" tombstone not being collected

TODO: videos-view-count
- videos don't parse properly in APIv2

TODO: APIv2-pinned-tweets
- feed with pinned tweet