Reported from the group: the same "Najczęściej piszesz między 12:00 a
13:00" line came back for Ala and for Jan Nowak, which is too much
of a coincidence to be a statistic.
It was the backfill. The 342 messages carried over from the pre-0.1.0
counter have no timestamps, so the seeded rows got a placeholder hour of
12 -- and favourite_hour was the one query that never excluded the
backfilled day. For every person those synthetic noons outnumbered every
real message they had sent since, so all seven got the same answer. The
genuine hours are 19-21: this group talks in the evening.
The comment above that placeholder said "the day is marked anyway, so
nothing that cares about hours will read these", which is exactly the
kind of reasoning that stops being true the moment somebody adds a
query. So the fix is not another `exclude` argument to remember: the
absent hour is now -1, which no real hour can be, and hour queries
filter `local_hour >= 0`. Forgetting the exclusion can no longer invent
an answer, and night_owl gets the same guard even though its 0..2 window
happened to miss the old placeholder.
Live database migrated with the service stopped and a backup taken: 342
rows moved from noon to unknown. Verified afterwards on the real data --
Ala 19:00, Jan Nowak 19:00, kuhy 20:00, and the two people whose
only messages are backfilled correctly get no hour line at all.
Not released. Sitting at 0.1.1 until kuhy says otherwise.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015d48t4qsQLBJnDwDeo2Nom
Krzysztof kuhy Rudnicki
40538b89a1