거래 빠르게 안티에서 병신만든거 커서로

feat: Implement backtest source management and enhance candle data handling

Changes:
- Introduced a new function `_apply_backtest_source_env_from_request` to manage the environment variables for candle, tick, and order book sources based on incoming requests.
- Added a teardown function `_teardown_backtest_source_env` to ensure that environment variables do not persist between requests, enhancing the stability of the backtesting environment.
- Refactored existing code to utilize the new source management functions, improving code readability and maintainability.
- Added new utility functions in `bt_candle_source.py` for fetching and managing candle data, ensuring consistency with live trading data sources.

Impact:
- These changes improve the flexibility and reliability of the backtesting framework, allowing for better management of data sources and reducing the risk of cross-request contamination.

kis_trader/utils/today_trades_cache.py

@@ -0,0 +1,64 @@
+"""당일 trade_history — 프로세스 공유 RAM + TTL.
+
+check_buy·포트가드가 같은 표를 나눠 씀. SELECT 연타·공유 DB 락 대기 완화.
+TTL 만료 또는 invalidate 시에만 DB 재조회 (DB 쓰기 아님).
+"""
+from __future__ import annotations
+
+import threading
+import time
+from typing import Any, Dict, List, Optional, Tuple
+
+_LOCK = threading.Lock()
+_DAY: str = ""
+_ROWS: List[Dict] = []
+_TS: float = 0.0
+
+
+def _ttl_sec() -> float:
+    try:
+        from .env import get_env_float
+        return float(get_env_float("TODAY_TRADES_CACHE_TTL_SEC", 1.0) or 1.0)
+    except Exception:
+        return 1.0
+
+
+def invalidate_today_trades_cache() -> None:
+    """매수 체결 직후 등 — 다음 get 이 DB 재조회."""
+    global _DAY, _ROWS, _TS
+    with _LOCK:
+        _DAY = ""
+        _ROWS = []
+        _TS = 0.0
+
+
+def get_today_trades_cached(
+    db: Any,
+    today: Optional[str] = None,
+) -> Tuple[List[Dict], bool, float]:
+    """Returns: (rows, from_cache, db_ms).
+
+    from_cache=True 이면 DB 미호출.
+    """
+    global _DAY, _ROWS, _TS
+    from datetime import datetime as dt
+
+    day = str(today or dt.now().strftime("%Y%m%d"))
+    ttl = _ttl_sec()
+    now = time.time()
+    with _LOCK:
+        if _DAY == day and (ttl <= 0 or (now - _TS) < ttl):
+            return list(_ROWS), True, 0.0
+
+    t0 = time.perf_counter()
+    try:
+        rows = list(db.get_trades_by_date(day) or [])
+    except Exception:
+        rows = []
+    db_ms = (time.perf_counter() - t0) * 1000.0
+
+    with _LOCK:
+        _DAY = day
+        _ROWS = rows
+        _TS = time.time()
+        return list(rows), False, db_ms