feat(realestate): 매물 DB 4테이블(listings/market_deals/matches/criteria)+헬퍼

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EqCYBhvTcdeCTUDX3RhWx9

realestate-lab/tests/test_listing_db.py

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+def test_listing_criteria_seed_and_update():
+    from app import db
+    c = db.get_listing_criteria()
+    assert c["id"] == 1 and "신대방동" in c["dongs"] and c["max_deposit"] == 32000
+    db.update_listing_criteria({"max_deposit": 30000, "equity": 15000})
+    assert db.get_listing_criteria()["max_deposit"] == 30000
+    assert db.get_listing_criteria()["equity"] == 15000
+
+def test_upsert_listing_idempotent_and_is_new():
+    from app import db
+    row = {"article_no": "A1", "source": "naver", "deal_type": "전세", "deposit": 29000,
+           "area_exclusive": 42.0, "complex_name": "OO", "dong": "신대방동", "dong_code": "11590"}
+    _, is_new = db.upsert_listing(row)
+    assert is_new is True
+    _, is_new2 = db.upsert_listing({**row, "deposit": 28000})
+    assert is_new2 is False
+    ls = db.get_listings()
+    assert len(ls) == 1 and ls[0]["deposit"] == 28000
+
+def test_market_deals_dedup_and_query():
+    from app import db
+    base = {"house_type": "아파트", "dong_code": "11590", "dong": "신대방동",
+            "complex_name": "OO", "area": 42.0, "deal_type": "전세",
+            "deposit": 43000, "sale_amount": None, "deal_ym": "202605", "floor": "5", "source": "molit"}
+    db.upsert_market_deal(base)
+    db.upsert_market_deal(base)  # 동일 → dedup
+    deals = db.get_market_deals_for("11590", "OO", 42.0, "전세", months=120)
+    assert len(deals) == 1
+
+def test_unnotified_listing_match_and_mark():
+    from app import db
+    lid, _ = db.upsert_listing({"article_no": "A2", "source": "naver", "deal_type": "전세",
+                                "deposit": 29000, "area_exclusive": 42.0, "dong": "신대방동"})
+    db.upsert_listing_match({"listing_id": lid[0] if isinstance(lid, tuple) else lid["id"],
+                             "category": "임차", "passed": 1, "match_score": 90,
+                             "safety_tier": "안전", "sample_size": 7, "reasons": ["ok"], "is_new": 1})
+    un = db.get_unnotified_listing_matches()
+    assert len(un) == 1
+    db.mark_listings_notified([un[0]["id"]])
+    assert db.get_unnotified_listing_matches() == []