fix(lotto): 학습 게이트 정직화 (engine-best vs random-best 6trial·명시적 gated·정체성 일관)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lotto/tests/test_backtest_db.py

@@ -182,6 +182,7 @@ def test_track_record_and_review_payload(monkeypatch):
 
     tr = bt.track_record()
     assert "random_null" in tr["by_strategy"]
+    # 이제 random_null은 N_NULL_TRIALS=6 행이므로 6*20=120장
     assert tr["by_strategy"]["random_null"]["n_tickets"] >= 20
 
     payload = bt.build_review_payload(40)
@@ -191,3 +192,129 @@ def test_track_record_and_review_payload(monkeypatch):
     assert "calibration_trend" in payload
     assert payload["winner_analysis"] is not None
     assert "score_total" in payload["winner_analysis"]
+
+
+def test_run_forward_purchase_random_null_count(monkeypatch):
+    """run_forward_purchase는 random_null을 N_NULL_TRIALS=6개 저장해야 한다."""
+    db = _fresh_db(monkeypatch)
+    _seed_draws(db, 40)
+    from app import backtest as bt
+    res = bt.run_forward_purchase(draw_no=40, k=20, pool_n=500, sample_seed=7)
+    assert res["ok"] is True
+    rows = db.get_backtest_runs(draw_no=40)
+    null_rows = [r for r in rows if r["strategy"] == "random_null"]
+    assert len(null_rows) == bt.N_NULL_TRIALS  # 6개
+    null_labels = {r["weight_label"] for r in null_rows}
+    assert null_labels == {f"r{i}" for i in range(bt.N_NULL_TRIALS)}
+    for r in null_rows:
+        assert r["n_tickets"] == 20
+
+
+def test_evaluate_weekly_gated_keeps_base_unchanged(monkeypatch):
+    """Fix 5 통합 테스트 (end-to-end gated path).
+
+    접근: DB에 draws, weight_trials, auto_picks, backtest_runs, base_history를 직접 심어
+    evaluate_weekly()의 gated 분기가 base를 바꾸지 않음을 검증한다.
+
+    gated 조건: engine_w 최고 prize_score − random_best < LIFT_EPSILON(10.0).
+    engine_best=5, random_best=20 → lift=-15 → gated.
+
+    evaluate_weekly 내부 흐름:
+      - get_weekly_trials(week_start) : _today_kst() 기준 week_start 사용
+      - get_latest_draw()             : draws 테이블에서 max(drw_no) 반환
+    두 참조가 같은 날짜 기준이어야 하므로 _today_kst를 monkeypatch로 고정하고
+    draws의 최신 회차 날짜(drw_date)를 해당 주의 날짜로 맞춘다.
+    """
+    import json as _json
+    from datetime import date, timedelta, datetime as _dt, timezone as _tz, timedelta as _td
+
+    db = _fresh_db(monkeypatch)
+
+    # KST 오늘 날짜 — evaluate_weekly가 이 날짜를 기준으로 week_start 계산
+    KST = _tz(_td(hours=9))
+    today_kst = _dt.now(KST).date()
+    from app import weight_evolver as we
+    week_start = we.get_week_start(today_kst)
+
+    # 1) draws 심기 — 최신 회차의 drw_date를 week_start 주 안의 날짜로 맞춤
+    import random as _r; _r.seed(99)
+    rows = []
+    for i in range(1, 41):
+        s = sorted(_r.sample(range(1, 46), 6))
+        # 마지막 회차(40)는 오늘 날짜 사용 (week_start 주 내)
+        if i == 40:
+            drw_date = today_kst.isoformat()
+        else:
+            drw_date = f"2020-01-{(i % 28) + 1:02d}"
+        rows.append({
+            "drw_no": i, "drw_date": drw_date,
+            "n1": s[0], "n2": s[1], "n3": s[2],
+            "n4": s[3], "n5": s[4], "n6": s[5],
+            "bonus": (s[5] % 45) + 1,
+        })
+    db.upsert_many_draws(rows)
+    latest = db.get_latest_draw()
+    assert latest is not None
+    assert latest["drw_date"] == today_kst.isoformat()
+
+    # 2) weight trial 1개 심기 (day_of_week=0, week_start=오늘 주)
+    trial_w = [0.2, 0.2, 0.2, 0.2, 0.2]
+    db.save_weight_trial(week_start, 0, trial_w, "perturb")
+    trial_rows = db.get_weekly_trials(week_start)
+    assert len(trial_rows) == 1
+    trial_id = trial_rows[0]["id"]
+
+    # 3) auto_picks 1개 심기 (winning 번호와 2개 일치 → max_correct=2)
+    winning6 = [latest["n1"], latest["n2"], latest["n3"],
+                latest["n4"], latest["n5"], latest["n6"]]
+    pick = winning6[:2] + [40, 41, 42, 43]
+    db.save_auto_pick(trial_id, 1, pick, meta_score=0.5)
+
+    # 4) backtest_runs: engine_w prize_score=5, random_null 6개 prize_score=20 (gated 확실)
+    LOW_HIST = {"m3": 5, "m4": 0, "m5": 0, "m6": 0, "bonus_hits": 0}   # prize=5
+    HIGH_HIST = {"m3": 20, "m4": 0, "m5": 0, "m6": 0, "bonus_hits": 0}  # prize=20
+    draw_no = latest["drw_no"]
+    db.save_backtest_run(
+        draw_no=draw_no, strategy="engine_w", weight_label="w0",
+        weight_json=_json.dumps(trial_w), trial_id=trial_id, n_tickets=20,
+        hist=LOW_HIST, best_match=2, avg_meta_score=0.5,
+    )
+    from app import backtest as bt
+    for i in range(bt.N_NULL_TRIALS):
+        db.save_backtest_run(
+            draw_no=draw_no, strategy="random_null", weight_label=f"r{i}",
+            weight_json=None, trial_id=None, n_tickets=20,
+            hist=HIGH_HIST, best_match=3, avg_meta_score=0.5,
+        )
+
+    # 5) current base 저장 (이전 주 월요일 effective_from)
+    base_w = [0.2, 0.2, 0.2, 0.2, 0.2]
+    prev_monday = (today_kst - timedelta(weeks=1, days=today_kst.weekday())).isoformat()
+    db.save_base_history(
+        effective_from=prev_monday,
+        weight=base_w,
+        source_trial_id=None,
+        update_reason="cold_start",
+        winner_score=None,
+        winner_max_correct=None,
+    )
+    assert db.get_current_base() == base_w
+
+    # 6) evaluate_weekly 호출 — _today_kst()를 monkeypatch로 오늘 날짜 고정
+    monkeypatch.setattr(we, "_today_kst", lambda: today_kst)
+
+    result = we.evaluate_weekly()
+
+    assert result.get("ok") is True, f"evaluate_weekly 실패: {result}"
+
+    # gated path 검증
+    update_reason = result.get("update_reason", "")
+    assert update_reason in ("unchanged_gated", "idempotent_skip"), (
+        f"gated여야 하는데 reason='{update_reason}' — 게이팅 로직 깨짐"
+    )
+
+    # base가 바뀌지 않았는지 검증
+    new_base = result.get("new_base")
+    assert new_base == base_w, (
+        f"gated인데 base가 변경됨: {new_base} != {base_w}"
+    )