diff --git a/src/backtester.py b/src/backtester.py
index 6860d75..a7e30ca 100644
--- a/src/backtester.py
+++ b/src/backtester.py
@@ -6,14 +6,20 @@
 from __future__ import annotations
 
 import json
+import warnings
 from dataclasses import dataclass, field, asdict
 from datetime import datetime
 from pathlib import Path
 
+import joblib
+import lightgbm as lgb
 import numpy as np
 import pandas as pd
 from loguru import logger
 
+# 크립토 24/7 시장: 15분봉 × 96봉/일 × 365일 = 35,040
+_ANNUALIZE_FACTOR = 35_040
+
 
 def _calc_trade_stats(trades: list[dict], initial_balance: float) -> dict:
     """거래 리스트에서 통계 요약을 계산한다. Backtester와 WalkForward 공통 사용."""
@@ -43,7 +49,7 @@ def _calc_trade_stats(trades: list[dict], initial_balance: float) -> dict:
 
     if len(pnls) > 1:
         pnl_arr = np.array(pnls)
-        sharpe = float(np.mean(pnl_arr) / np.std(pnl_arr) * np.sqrt(24192)) if np.std(pnl_arr) > 0 else 0.0
+        sharpe = float(np.mean(pnl_arr) / np.std(pnl_arr) * np.sqrt(_ANNUALIZE_FACTOR)) if np.std(pnl_arr) > 0 else 0.0
     else:
         sharpe = 0.0
 
@@ -81,11 +87,6 @@ def _calc_trade_stats(trades: list[dict], initial_balance: float) -> dict:
         "close_reasons": reasons,
     }
 
-import warnings
-
-import joblib
-import lightgbm as lgb
-
 from src.dataset_builder import (
     _calc_indicators, _calc_signals, _calc_features_vectorized,
     generate_dataset_vectorized, stratified_undersample,
diff --git a/src/bot.py b/src/bot.py
index e0668b0..bb7b020 100644
--- a/src/bot.py
+++ b/src/bot.py
@@ -530,6 +530,7 @@ class TradingBot:
                         self.current_trade_side = None
                         self._entry_price = None
                         self._entry_quantity = None
+                        self._close_event.set()
                         self._close_handled_by_sync = False
                         continue
                 except Exception as e:
diff --git a/src/ml_features.py b/src/ml_features.py
index 4fbeae0..fde2f36 100644
--- a/src/ml_features.py
+++ b/src/ml_features.py
@@ -320,7 +320,16 @@ def build_features_aligned(
     else:
         base["oi_change_ma5"] = np.nan
 
-    base["oi_price_spread"] = float(oi_price_spread) if oi_price_spread is not None else np.nan
+    # oi_price_spread = oi_z - ret_1_z (학습과 동일하게 z-score 적용된 값의 차이)
+    if oi_history and len(oi_history) >= 2 and oi_price_spread is not None:
+        oi_z = base.get("oi_change", np.nan)
+        ret_1_z = base.get("ret_1", 0.0)
+        if not np.isnan(oi_z):
+            base["oi_price_spread"] = oi_z - ret_1_z
+        else:
+            base["oi_price_spread"] = np.nan
+    else:
+        base["oi_price_spread"] = np.nan
     base["adx"] = adx_z
 
     return pd.Series(base)
diff --git a/src/notifier.py b/src/notifier.py
index 7a147c3..ce39ab5 100644
--- a/src/notifier.py
+++ b/src/notifier.py
@@ -17,7 +17,10 @@ class DiscordNotifier:
             return
         try:
             loop = asyncio.get_running_loop()
-            loop.run_in_executor(None, self._send_sync, content)
+            fut = loop.run_in_executor(None, self._send_sync, content)
+            fut.add_done_callback(
+                lambda f: f.exception() and logger.warning(f"Discord 전송 실패: {f.exception()}")
+            )
         except RuntimeError:
             self._send_sync(content)