feat(Core/UI): 백테스트 전역 엔진 선택 버튼 추가 및 스캘핑 Rust 방어로직 포팅 1차 완료

scratch/explain_heavy.py

@@ -0,0 +1,38 @@
+import sys
+sys.path.insert(0, '/home/hoon/kis_bot')
+from database import TradeDB
+
+db = TradeDB()
+today = '20260813'
+
+queries = [
+    # 1. KIS vs Kiwoom 교집합 (heavy 쿼리 예상)
+    f"""
+    EXPLAIN SELECT
+      k.code,
+      k.n AS kis_n,
+      w.n AS kiwoom_n,
+      ROUND(w.n / NULLIF(k.n, 0), 3) AS ratio_kw_over_kis
+    FROM (
+      SELECT code, COUNT(*) n FROM ws_ticks
+      WHERE tick_time LIKE '{today}%' AND source='kis' GROUP BY code
+    ) k
+    INNER JOIN (
+      SELECT code, COUNT(*) n FROM ws_ticks
+      WHERE tick_time LIKE '{today}%' AND source='kiwoom' GROUP BY code
+    ) w ON k.code = w.code
+    """,
+    # 2. filter_eval 종목 교집합 등
+    f"EXPLAIN SELECT code, COUNT(*) n FROM ws_orderbook WHERE snap_time LIKE '{today}%' AND source='filter_eval' GROUP BY code"
+]
+
+for q in queries:
+    print(f"\n--- Query: {q} ---")
+    try:
+        rows = db.conn.execute(q).fetchall()
+        for r in rows:
+            print(dict(r))
+    except Exception as e:
+        print("Error:", e)
+
+db.close()