fix(tradein/estimator): scope year_built NULL cohort-bypass away from avito (#2013) #2474

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bot-backend commented

2026-07-12 12:22:56 +00:00

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Bug: the cohort/era WHERE clause in the analog-selection SQL carried an OR year_built IS NULL escape, originally added because avito frequently has no parsed year_built. In practice this let ANY-era avito listing bypass the cohort filter entirely once cohort_year_min/cohort_year_max were set for the target — a khrushchevka target could pull in a modern-era avito comp with no year parsed (and vice versa), polluting the comp pool with wrong-era analogs.

Fix: narrow the NULL escape so it no longer applies to source = 'avito':

-- before
OR year_built IS NULL
-- after
OR (year_built IS NULL AND source <> 'avito')

Applied identically in both places that must stay in sync (per existing code comments):

_COMMON_WHERE (Tier S / Tier H, app/services/estimator.py ~line 4210-4226)
Tier W inline SQL copy (app/services/estimator.py ~line 4636-4648)

CAST/param structure left untouched — only the AND source <> 'avito' guard was added to the existing OR year_built IS NULL disjunct. Confirmed source is unqualified-in-scope in both queries (both FROM listings directly, no alias/JOIN). Non-avito NULL-year rows (cian/domklik/etc without a parsed year) still pass through untouched, as before.

Test: tests/test_estimator_avito_cohort_null_2013.py — SQL-source assertions that both cohort blocks contain the new guard, stay in sync (exactly 2 occurrences of the guard string across the file), and that the old unscoped OR year_built IS NULL predicate form is fully gone (catches a partial fix touching only one copy). A full DB-backed integration test asserting an avito NULL-year row is excluded while a cian NULL-year row still passes was impractical here — this suite's estimator tests run against a dummy DATABASE_URL with no live DB (same pattern as tests/test_estimator_cohort.py / tests/test_estimator_pure_units.py).

Test results: regression gate + full estimator suite green — 473 passed (test_backtest_regression_gate.py, test_backtest_fixture_roundtrip.py, all test_estimator*.py). The regression gate replays a frozen 277-DKP fixture pool and did not move, as expected (it does not touch the live DB path this change affects).

Not expected to be byte-identical on the live DB analog-selection path (this changes which avito rows qualify as comps) — that is the intended fix.

**Bug**: the cohort/era WHERE clause in the analog-selection SQL carried an `OR year_built IS NULL` escape, originally added because avito frequently has no parsed `year_built`. In practice this let ANY-era avito listing bypass the cohort filter entirely once `cohort_year_min`/`cohort_year_max` were set for the target — a khrushchevka target could pull in a modern-era avito comp with no year parsed (and vice versa), polluting the comp pool with wrong-era analogs. **Fix**: narrow the NULL escape so it no longer applies to `source = 'avito'`: ```sql -- before OR year_built IS NULL -- after OR (year_built IS NULL AND source <> 'avito') ``` Applied identically in both places that must stay in sync (per existing code comments): - `_COMMON_WHERE` (Tier S / Tier H, `app/services/estimator.py` ~line 4210-4226) - Tier W inline SQL copy (`app/services/estimator.py` ~line 4636-4648) CAST/param structure left untouched — only the `AND source <> 'avito'` guard was added to the existing `OR year_built IS NULL` disjunct. Confirmed `source` is unqualified-in-scope in both queries (both `FROM listings` directly, no alias/JOIN). Non-avito NULL-year rows (cian/domklik/etc without a parsed year) still pass through untouched, as before. **Test**: `tests/test_estimator_avito_cohort_null_2013.py` — SQL-source assertions that both cohort blocks contain the new guard, stay in sync (exactly 2 occurrences of the guard string across the file), and that the old unscoped `OR year_built IS NULL` predicate form is fully gone (catches a partial fix touching only one copy). A full DB-backed integration test asserting an avito NULL-year row is excluded while a cian NULL-year row still passes was impractical here — this suite's estimator tests run against a dummy `DATABASE_URL` with no live DB (same pattern as `tests/test_estimator_cohort.py` / `tests/test_estimator_pure_units.py`). **Test results**: regression gate + full estimator suite green — `473 passed` (`test_backtest_regression_gate.py`, `test_backtest_fixture_roundtrip.py`, all `test_estimator*.py`). The regression gate replays a frozen 277-DKP fixture pool and did not move, as expected (it does not touch the live DB path this change affects). Not expected to be byte-identical on the live DB analog-selection path (this changes which avito rows qualify as comps) — that is the intended fix.

bot-backend added 1 commit 2026-07-12 12:22:57 +00:00

fix(tradein/estimator): scope year_built NULL cohort-bypass away from avito (#2013 )

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e042e9bbfd

Cohort/era WHERE clause carried `OR year_built IS NULL`, meant to let avito's
frequently-missing year_built field through the filter. In practice this let
ANY-era avito listing bypass the cohort filter entirely once cohort_year_min/
max were set — pollution bug: khrushchevka target could pull in a modern avito
comp with no year parsed, and vice versa.

Narrow the escape to `OR (year_built IS NULL AND source <> 'avito')` in both
places that must stay in sync:
- _COMMON_WHERE (Tier S/H, ~estimator.py:4210)
- Tier W inline SQL copy (~estimator.py:4640)

Non-avito NULL-year rows (cian/domklik/etc without a parsed year) still pass
through untouched; avito NULL-year rows now must satisfy the same
year_built BETWEEN cohort_year_min AND cohort_year_max test as everything
else.

Added tests/test_estimator_avito_cohort_null_2013.py: SQL-source assertions
that both cohort blocks carry the new guard, stay in sync (exactly 2
occurrences), and that the old unscoped escape is gone. A full DB-backed
integration test was impractical — this suite's estimator tests run against
a dummy DATABASE_URL with no live DB.

bot-backend commented

2026-07-12 13:07:47 +00:00

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Закрываю в пользу feat/2013-domrf-year-backfill. Причина: этот подход (исключение avito из cohort через source <> 'avito') конфликтует с намеренным guard-тестом test_estimator_fetch_analogs_includes_avito (avito — крупнейший источник, 43k, должен оставаться в пуле аналогов) и снимает ~все avito из cohort-gated пулов. Настоящий фикс #2013 — бэкфилл реальных годов: houses.year_built ← COALESCE(ДОМ.РФ commission_year, zhkh_year уже 70%), затем houses.year_built → listings.year_built по house_id_fk. Тогда cohort-фильтр работает на реальных годах без исключения источника.

Закрываю в пользу feat/2013-domrf-year-backfill. Причина: этот подход (исключение avito из cohort через `source <> 'avito'`) конфликтует с намеренным guard-тестом test_estimator_fetch_analogs_includes_avito (avito — крупнейший источник, 43k, должен оставаться в пуле аналогов) и снимает ~все avito из cohort-gated пулов. Настоящий фикс #2013 — бэкфилл реальных годов: houses.year_built ← COALESCE(ДОМ.РФ commission_year, zhkh_year уже 70%), затем houses.year_built → listings.year_built по house_id_fk. Тогда cohort-фильтр работает на реальных годах без исключения источника.