feat: P0-02/P0-03/P0-05 数据库时间语义与约束

P0-02: MatchStats 增加 source/source_record_id/retrieved_at/available_at
        context_builder 过滤统计数据时检查 available_at <= cutoff
P0-03: Prediction 增加 match_kickoff_at/prediction_created_at/prediction_cutoff_at
        明确区分比赛时间/预测创建时间/数据截止时间
P0-05: Prediction 增加 status 字段(success/failed/degraded)
        数据库 CHECK 约束

Alembic: 0005_prediction_status_and_stats_provenance

P1-02: injuries as_of 不再截断为 date,保持 datetime 精度

src/api/routes/backtest.py

@@ -1,11 +1,15 @@
 """回测路由。"""
 from __future__ import annotations
 
+import logging
+
 from fastapi import APIRouter, HTTPException
 from pydantic import BaseModel, Field
 
 from src.llm.backtest import run_backtest
 
+logger = logging.getLogger(__name__)
+
 router = APIRouter(prefix="/api/v1", tags=["backtest"])
 
 
@@ -38,7 +42,8 @@ async def backtest(req: BacktestRequest):
             model=req.model,
         )
     except Exception as e:
-        raise HTTPException(500, f"backtest failed: {e}")
+        logger.exception("backtest failed")
+        raise HTTPException(500, "回测执行失败,请查看服务器日志")
 
     return {
         "summary": {
@@ -46,7 +51,7 @@ async def backtest(req: BacktestRequest):
             "scored": summary.scored,
             "accuracy_1x2": summary.accuracy_1x2,
             "avg_score_rmse": summary.avg_score_rmse,
-            "avg_subjective_confidence": summary.avg_confidence,
+            "avg_subjective_confidence": summary.avg_subjective_confidence,
             "calibration": summary.calibration,
         },
         "results": [