From 9f897ea4a042bd42f8040065d4b822b7934a5621 Mon Sep 17 00:00:00 2001
From: gahusb <bgg8988@gmail.com>
Date: Sun, 31 May 2026 17:04:35 +0900
Subject: [PATCH] =?UTF-8?q?feat(lotto):=20point=5Fin=5Ftime=5Fdraws=20?=
 =?UTF-8?q?=ED=97=AC=ED=8D=BC?=
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 lotto/app/backtest.py        | 6 ++++++
 lotto/tests/test_backtest.py | 8 ++++++++
 2 files changed, 14 insertions(+)

diff --git a/lotto/app/backtest.py b/lotto/app/backtest.py
index 132ebe5..b0c838b 100644
--- a/lotto/app/backtest.py
+++ b/lotto/app/backtest.py
@@ -85,6 +85,12 @@ def random_null_tickets(k: int, seed: Optional[int] = None) -> List[List[int]]:
     return out
 
 
+def point_in_time_draws(draws: List[Tuple[int, List[int]]],
+                        target_draw_no: int) -> List[Tuple[int, List[int]]]:
+    """target 회차 추첨 '직전' 시점의 데이터 — target_draw_no 미만만."""
+    return [(d, nums) for d, nums in draws if d < target_draw_no]
+
+
 def coverage_tickets(k: int, seed: Optional[int] = None) -> List[List[int]]:
     """greedy 커버리지 — 아직 덜 쓰인 번호를 우선 배치해 번호를 넓게 분산.
     (휠링/보장설계는 향후. 현재는 distinct + 번호 사용 균등화)"""
diff --git a/lotto/tests/test_backtest.py b/lotto/tests/test_backtest.py
index 9eee498..0972492 100644
--- a/lotto/tests/test_backtest.py
+++ b/lotto/tests/test_backtest.py
@@ -60,6 +60,14 @@ def test_random_null_and_coverage_distinct():
     assert len(flat) >= 40   # 커버리지 전략은 번호를 넓게 퍼뜨림
 
 
+def test_point_in_time_excludes_target_draw():
+    draws = _toy_draws(50)   # drw_no 1..50
+    pit = bt.point_in_time_draws(draws, target_draw_no=30)
+    assert all(d < 30 for d, _ in pit)   # 30 이상 제외
+    assert max(d for d, _ in pit) == 29
+    assert len(pit) == 29
+
+
 def test_generate_pool_partial_fill(monkeypatch):
     """weighted_sample_6이 항상 같은 조합만 반환하도록 패치 → cap에 먼저 걸려 len < n — 예외 없이 반환."""
     import random as _r