Bound GET /posts/notifications/:addr to the viewer's activity in a
configurable block window (NOTIFICATION_BLOCK_WINDOW, default 25000):
read the viewer's posts from addrPostHeights, prefix-scan postLikes and
postChildren for those posts only, and read follows from the new
followeeHeights index. The global likes, postChildren, and follows stores
are no longer full-scanned, and pagination.total counts only in-window
notifications.
Add the indexer write of a followeeHeights entry on every follow and
unfollow, the DB followee-index backfill utility and CLI, the
followeeheight /level route, the notification window config, unit,
property, and acceptance coverage, and developer docs.
By coder.