fix(lotto): Phase 3 리뷰 반영 (run-forward 백그라운드·review 404·track_record distinct·테스트 보강)

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

lotto/app/backtest.py

@@ -207,6 +207,7 @@ def track_record() -> Dict[str, Any]:
     db = _db()
     rows = db.get_backtest_runs()
     agg: Dict[str, Dict[str, int]] = {}
+    draw_sets: Dict[str, set] = {}
     for r in rows:
         a = agg.setdefault(r["strategy"], {
             "n_tickets": 0, "1st": 0, "2nd": 0, "3rd": 0, "4th": 0, "5th": 0, "draws": 0})
@@ -214,7 +215,9 @@ def track_record() -> Dict[str, Any]:
         a["n_tickets"] += r["n_tickets"]
         for tier in ("1st", "2nd", "3rd", "4th", "5th"):
             a[tier] += p[tier]
-        a["draws"] += 1
+        draw_sets.setdefault(r["strategy"], set()).add(r["draw_no"])
+    for strat, s in draw_sets.items():
+        agg[strat]["draws"] = len(s)
     return {"by_strategy": agg}