fix(yandex-valuation): cap area_m2 sanity (drop >10000 or <=0)

Live observation: sweep on "Базовый переулок, 52" produced area_m2=2_025_106.7
(concatenated digits across DOM boundaries) -> psycopg.NumericValueOutOfRange on
INSERT, lost entire batch of 30 items from page=1.

Cap at 10_000 m2 (residential ceiling) and drop <=0. Keeps the rest of the
item (price, dates, status) so the row still persists with area_m2=NULL --
better than losing the whole batch.

tradein-mvp/backend/app/services/scrapers/yandex_valuation.py

@@ -281,7 +281,17 @@ class YandexValuationScraper(BaseScraper):
 
         # area + rooms
         area_m = RE_ITEM_AREA.search(text)
-        area_m2 = float(area_m.group(1).replace(",", ".")) if area_m else None
+        area_m2: float | None = float(area_m.group(1).replace(",", ".")) if area_m else None
+        # Sanity cap — Yandex page text sometimes concatenates digits across DOM
+        # boundaries (e.g. "2025\xa0106,7 м²" → 2_025_106.7). Flats over 10_000 m²
+        # are impossible; DB column is NUMERIC(8,2) which overflows at 10^6.
+        # Drop the value rather than block the whole save batch.
+        if area_m2 is not None and (area_m2 > 10_000 or area_m2 <= 0):
+            logger.warning(
+                "yandex_valuation: dropping nonsensical area_m2=%s from item chunk",
+                area_m2,
+            )
+            area_m2 = None
 
         rooms: int | None = None
         if RE_ITEM_STUDIO.search(text):

tradein-mvp/backend/tests/test_yandex_valuation.py

@@ -337,3 +337,50 @@ def test_validate_match_no_expected_returns_one():
 
     meta = ValuationHouseMeta(year_built=None, total_floors=None)
     assert meta.validate_match(None, None) == 1.0
+
+
+# ---------------------------------------------------------------------------
+# Sanity cap regression — area_m2 overflow (2026-05-24)
+# ---------------------------------------------------------------------------
+
+
+def test_parse_item_drops_overflow_area():
+    """Regression: area_m2 > 10_000 (e.g. concatenated digits) must be set None,
+    not blow up the save batch. Dates and exposure_days should survive.
+
+    The live bug: chunk-text fallback concatenated digits across a DOM boundary,
+    producing area_m2=2_025_106.7 → psycopg.NumericValueOutOfRange on INSERT.
+    The cap drops area_m2 to None so the row still saves with area NULL.
+    """
+    # Bare concatenated digits (no whitespace between groups) — reproduction of
+    # what the chunked-text path emitted in production.  Price is placed after
+    # the area token so the item stays valid (area_m2 dropped → start_price keeps it).
+    text = (
+        "3-комнатная 2025106,7 м²  25 этаж  "
+        "01.07.2024  5 500 000 ₽  В экспозиции 514 дней  26.11.2025"
+    )
+    item = YandexValuationScraper._parse_item_text(text)
+    assert item is not None
+    assert item.area_m2 is None, f"expected None for absurd area, got {item.area_m2}"
+    assert item.publish_date == date(2024, 7, 1)
+    assert item.removed_date == date(2025, 11, 26)
+
+
+def test_parse_item_keeps_normal_area():
+    """Normal residential area must pass through unchanged."""
+    text = (
+        "2-комнатная 58,2 м²  3 этаж  "
+        "10.05.2024  9 300 000 ₽  159 932 ₽ за м²  "
+        "9 300 000 ₽  159 932 ₽ за м²  "
+        "В экспозиции 30 дней  В продаже"
+    )
+    item = YandexValuationScraper._parse_item_text(text)
+    assert item is not None
+    assert item.area_m2 == 58.2
+
+
+def test_parse_item_drops_zero_area():
+    text = "1-комнатная 0 м²  3 этаж  10.05.2024  5 000 000 ₽  В продаже"
+    item = YandexValuationScraper._parse_item_text(text)
+    assert item is not None
+    assert item.area_m2 is None