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92 lines
4 KiB
Python
92 lines
4 KiB
Python
"""listings_snapshots writer — point-in-time observation per listing per day.
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Таблица listings_snapshots (016_listings_snapshots.sql):
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PRIMARY KEY (listing_id, snapshot_date) — максимум 1 snapshot в сутки.
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ON CONFLICT DO UPDATE — берём последний за день (перезаписываем при повторном run'е).
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Используется двумя путями:
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1. SERP scrape (save_listings в base.py) — записывает цену + позицию в выдаче
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каждый раз когда listing появляется в поиске.
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2. Detail backfill (save_detail_enrichment в cian_detail.py) — записывает цену
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из detail-страницы для listings которые раньше не имели snapshot'а.
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"""
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from __future__ import annotations
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import logging
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from datetime import date
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from sqlalchemy import text
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from sqlalchemy.orm import Session
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logger = logging.getLogger(__name__)
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def upsert_listing_snapshot(
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db: Session,
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*,
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listing_id: int,
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price_rub: int,
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price_per_m2: int | None = None,
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run_id: int | None = None,
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snapshot_date: date | None = None,
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position_in_serp: int | None = None,
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status: str | None = "active",
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) -> None:
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"""Записать / обновить snapshot для listing за текущий (или указанный) день.
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Идемпотентно: повторный вызов с теми же listing_id + snapshot_date перезаписывает
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строку (берём последние данные за день — ON CONFLICT DO UPDATE).
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Args:
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db: открытая SQLAlchemy session. Commit делает CALLER.
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listing_id: PK из таблицы listings.
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price_rub: текущая цена в рублях.
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price_per_m2: цена за кв.м (вычисляется в caller'е, None если нет).
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run_id: FK scrape_runs.id — с каким run'ом связан snapshot (None если backfill
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запускается вне run'а).
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snapshot_date: дата наблюдения; если None — используется CURRENT_DATE (по БД).
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position_in_serp: позиция в SERP (1..60+), только при SERP-scrape.
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status: 'active' / 'closed' / None. Default 'active' при обычном scrape.
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"""
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db.execute(
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text("""
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INSERT INTO listings_snapshots
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(listing_id, snapshot_date, run_id,
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price_rub, price_per_m2, position_in_serp, status, observed_at)
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VALUES (
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CAST(:lid AS bigint),
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COALESCE(CAST(:snap_date AS date), CURRENT_DATE),
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CAST(:run_id AS bigint),
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CAST(:price AS bigint),
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CAST(:ppm2 AS int),
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CAST(:pos AS int),
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:status,
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NOW()
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)
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ON CONFLICT (listing_id, snapshot_date) DO UPDATE SET
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run_id = COALESCE(EXCLUDED.run_id, listings_snapshots.run_id),
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price_rub = EXCLUDED.price_rub,
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price_per_m2 = COALESCE(EXCLUDED.price_per_m2, listings_snapshots.price_per_m2),
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position_in_serp = COALESCE(
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EXCLUDED.position_in_serp, listings_snapshots.position_in_serp
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),
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status = COALESCE(EXCLUDED.status, listings_snapshots.status),
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observed_at = EXCLUDED.observed_at
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"""),
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{
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"lid": listing_id,
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"snap_date": snapshot_date,
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"run_id": run_id,
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"price": price_rub,
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"ppm2": price_per_m2,
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"pos": position_in_serp,
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"status": status,
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},
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)
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logger.debug(
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"upsert_listing_snapshot: listing_id=%s date=%s price=%s run_id=%s",
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listing_id,
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snapshot_date or "CURRENT_DATE",
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price_rub,
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run_id,
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)
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