Harwinder Sekhon
28b591d786
1. A backfill pass silently wiped teacher identity from live rows.
The provenance compare is `>=`, and backfill rows are llm-scored but
carry no teacher_model/teacher_prompt_sha1 (neither source DB recorded
one), so a bare assignment blanked what the live hook had stored.
Re-running the backfill — e.g. after importing the live server's
signals.db, which is the next planned step — would have erased it from
every live row. COALESCE now keeps a stored identity when the incoming
one is NULL, while a genuinely newer teacher still replaces it.
Timestamps clamp for the same reason: backfill stamps historical
values, so first_seen only moves earlier and last_seen only later.
2. A retried batch could be applied twice. executemany does not roll
itself back, so a batch that half-landed and then hit a lock was
re-applied whole by _with_lock_retry, double-counting seen_count on
the rows that already landed. Writes now run in an explicit BEGIN
IMMEDIATE with a rollback, which also takes the write lock up front so
contention fails before any row is applied.
3. The archive hook could break a news fetch. archive_headlines swallows
its own failures, but its ARGUMENTS are evaluated first, so a raising
get_llm_client() escaped that guard. Guarded at the call site too:
archiving is a side effect and must never cost us the headlines we
just fetched.
Both 1 and 2 were verified to reproduce against 301bf90 before fixing
(teacher_model -> None; seen_count 3 instead of 2 on the rows that
landed pre-failure) and are now regression tests.
Also fixed two weak tests of my own: the disabled-by-config test never
pointed NEWS_ARCHIVE_PATH at its temp dir, so its assertion passed
regardless of behaviour and the write went to the real archive; and the
neutral-headline test asserted the headline was archived without showing
it is dropped downstream, which is the entire reason the hook sits where
it does. Positional binding of the provenance rank is now asserted rather
than trusted, since a miscount would shift every parameter silently.
483 -> 486 tests.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bzv4ETVapFNauFDQht7QtA