Fixed
- The daemon fetches the senders that cached messages name but the cache lacks, so
sender:namefinds their messages andtg messagesshows their names. Caches synced before
0.9.0 have many (about 3% of the messages of a 1.16M-message cache), and a live message still
leaves one now and then. Once a day the daemon asks Telegram for one message of each such
sender by ID, up to 100 per request, only when it has no other sync work: on a made-up cache of
that shape, 349 requests for 2,960 senders. A sender Telegram doesn't return is asked again
30 days later.tg statusshows how many senders are still missing (#143).