diff --git a/backend/app/main.py b/backend/app/main.py
index 2bc1690..b07f1b8 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -132,3 +132,30 @@ def health_keys() -> dict[str, object]:
         "dart": dart_mod.ping(),
         # huggingface 는 모델 다운로드 시점에 확인 (별도 ping 호출 비용 회피)
     }
+
+
+@app.get("/health/models")
+def health_models() -> dict[str, object]:
+    """Chronos / LGBM 가용성 진단.
+
+    Chronos: lazy 로드 첫 호출이라 30초~수 분 걸릴 수 있음 (HuggingFace 다운로드).
+    LGBM: 체크포인트 디렉토리 스캔 — retrain 안 돈 cold start 에선 비어있음.
+    """
+    from pathlib import Path
+
+    from app.models import chronos as chronos_mod
+
+    lgbm_dir = Path(os.environ.get("LGBM_MODEL_DIR", "/app/data/models"))
+    lgbm_files: list[str] = []
+    if lgbm_dir.exists():
+        lgbm_files = sorted(p.name for p in lgbm_dir.glob("*.pkl"))
+
+    return {
+        "chronos": chronos_mod.ping(),
+        "lgbm": {
+            "model_dir": str(lgbm_dir),
+            "checkpoint_count": len(lgbm_files),
+            "samples": lgbm_files[:8],  # 너무 많으면 잘라서.
+            "status": "ok" if lgbm_files else "no_checkpoints (cold start, run retrain_weekly)",
+        },
+    }
diff --git a/backend/app/models/ensemble.py b/backend/app/models/ensemble.py
index b3a6b23..25f4e03 100644
--- a/backend/app/models/ensemble.py
+++ b/backend/app/models/ensemble.py
@@ -87,30 +87,41 @@ def predict(code: str, *, horizons: tuple[int, ...] = (1, 3, 5)) -> EnsemblePred
 
     sources_used: list[str] = []
     cf: ChronosForecast | None = None
+    chronos_err: str | None = None
     try:
         cf = chronos_forecast(closes, horizon=max_h, num_samples=30)
         sources_used.append("chronos")
     except Exception as exc:  # noqa: BLE001
-        logger.warning("chronos forecast failed for %s: %s", code, exc)
+        chronos_err = f"{type(exc).__name__}: {exc}"
+        logger.warning("chronos forecast failed for %s: %s", code, chronos_err)
 
     steps: list[EnsembleStep] = []
     lgbm_raw: dict[int, LgbmForecast] = {}
     for h in horizons:
         lf: LgbmForecast | None = None
+        lgbm_err: str | None = None
         try:
             lf = lgbm_predict(code, h)
             if lf is not None:
                 sources_used.append(f"lgbm_h{h}")
                 lgbm_raw[h] = lf
+            else:
+                # predict_one 이 None 반환 = 체크포인트 파일 없음 (cold start).
+                lgbm_err = "model checkpoint not found (run retrain_weekly)"
         except Exception as exc:  # noqa: BLE001
-            logger.warning("lgbm predict failed for %s h=%d: %s", code, h, exc)
+            lgbm_err = f"{type(exc).__name__}: {exc}"
+            logger.warning("lgbm predict failed for %s h=%d: %s", code, h, lgbm_err)
 
         # 가중치 (DB 없으면 default 0.6/0.4).
         w = load_weights(code, h)
         wc, wl = w.w_chronos, w.w_lgbm
         # 한쪽이 없으면 다른 쪽 전부.
         if cf is None and lf is None:
-            raise RuntimeError(f"both chronos & lgbm failed for {code} h={h}")
+            # 사용자가 브라우저에서 바로 원인을 보게 두 에러를 그대로 노출.
+            raise RuntimeError(
+                f"both chronos & lgbm failed for {code} h={h}; "
+                f"chronos={chronos_err or 'unknown'}; lgbm={lgbm_err or 'unknown'}"
+            )
         if cf is None:
             wc, wl = 0.0, 1.0
         if lf is None:
diff --git a/restart-ci.bat b/restart-ci.bat
new file mode 100644
index 0000000..f58aa95
--- /dev/null
+++ b/restart-ci.bat
@@ -0,0 +1,57 @@
+@echo off
+REM stock_chart_site - SSH/CI 친화 재시작 스크립트
+REM
+REM restart.bat 과의 차이: pause 가 없음. SSH 비대화형 (예: ssh user@host "restart-ci.bat")
+REM 에서 멈추지 않고 끝까지 실행. 에러는 종료 코드로만 알린다.
+REM
+REM 일반 사용 시엔 restart.bat 을 쓰는게 출력 검토에 편하다.
+
+setlocal enabledelayedexpansion
+cd /d "%~dp0"
+
+echo === stock_chart_site restart-ci ===
+
+where docker >nul 2>&1
+if errorlevel 1 (
+    echo [ERROR] docker not found
+    exit /b 1
+)
+docker info >nul 2>&1
+if errorlevel 1 (
+    echo [ERROR] Docker Desktop not running
+    exit /b 1
+)
+
+set USE_GPU=0
+where nvidia-smi >nul 2>&1
+if not errorlevel 1 (
+    nvidia-smi >nul 2>&1
+    if not errorlevel 1 set USE_GPU=1
+)
+
+if "%USE_GPU%"=="1" (
+    echo [GPU] using GPU profile
+    set COMPOSE_FILES=-f docker-compose.yml -f docker-compose.gpu.yml
+) else (
+    echo [CPU] using CPU profile
+    set COMPOSE_FILES=-f docker-compose.yml
+)
+
+for /f %%i in ('docker compose %COMPOSE_FILES% ps --status running --quiet backend web 2^>nul ^| find /v /c ""') do set RUN_COUNT=%%i
+if "%RUN_COUNT%"=="0" (
+    echo [ERROR] backend/web not running. run build.bat first.
+    exit /b 1
+)
+
+echo === docker compose up -d --force-recreate --no-deps backend web ===
+docker compose %COMPOSE_FILES% up -d --force-recreate --no-deps backend web
+if errorlevel 1 (
+    echo [ERROR] restart failed
+    exit /b 1
+)
+
+echo === status ===
+docker compose %COMPOSE_FILES% ps
+
+endlocal
+exit /b 0