A subscription pulled in from YouTube left an explored channel flagged as an exploration's, so its
later videos came in hidden from the Library with their watched marks waiting for good; a subscribe
landing while an exploration's videos came in left those flagged too. One step, settle_explored,
now holds the rule by who follows the channel now: the subscribe here, the subscription import, the
watched-channel videos and the explore page all end with it. Migration 0116 clears what the gap
left behind.
The list's "may still grow" count no longer counts a channel it already shows from a stub row, and
the comments on the cleanup's keep rule and on the in-memory daily shares say what they do.
- A channel someone follows: the videos its exploration brings in (the list's
dialog, the channel page's explore) come in as the catalog's own, not
flagged via_explore, which subscribing would never clear and which kept
their watched marks waiting for good.
- The explore cleanup keeps the row of a channel a Takeout history shows
watched (it still reclaims the videos), so a looked-at channel no longer
drops off the list.
- The Shorts job takes up only users whose list still has lengths to ask or
channels to name, by each user's own follows, blocks and dismissals; a
naming that failed is tried again, and the list says it is not complete.
- The length lookups have a daily share of their own: a large history no
longer leaves the export's Watch later file waiting a day.
- Only a channel of the user's own history can be put out of the list.
- The dialog's videos have a query root of their own: the list's
invalidations no longer re-ask (and re-explore) under an open dialog.
The import asks YouTube how long the watched videos of the candidate
channels are (five or more watched, none the user follows, blocked, put
out or owns), keeps the length on the Takeout row and names the channels
that make the list: five videos of five minutes or more. The shorts job
asks what an import could not. A channel's counted videos come in as an
exploration's when its list is opened, ready to play; a channel can be put
out of the list and back.
peter