diff --git a/backend/main.py b/backend/main.py
index 30012e7..35dffe2 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -432,7 +432,14 @@ async def get_signal_latest(user: dict = Depends(get_current_user)):
             sym
         )
         if row:
-            result[sym.replace("USDT", "")] = row
+            data = dict(row)
+            # factors可能是JSON string（psycopg2写入），需要解析
+            if isinstance(data.get("factors"), str):
+                try:
+                    data["factors"] = json.loads(data["factors"])
+                except Exception:
+                    pass
+            result[sym.replace("USDT", "")] = data
     return result
 
 
diff --git a/signal-engine.log b/signal-engine.log
index 22bf754..772430d 100644
--- a/signal-engine.log
+++ b/signal-engine.log
@@ -124,3 +124,18 @@
 2026-03-02 00:25:21,780 [INFO] signal-engine: [SOLUSDT] 🚨 信号[v51_baseline]: LONG score=92 price=83.8
 2026-03-02 00:25:21,780 [INFO] signal-engine: [SOLUSDT] 🚨 信号[v52_8signals]: LONG score=87 price=83.8
 2026-03-02 00:25:53,073 [INFO] signal-engine: 冷启动保护期结束，模拟盘开仓已启用
+2026-03-02 00:34:24,612 [INFO] signal-engine: 已加载策略配置: v51_baseline, v52_8signals
+2026-03-02 00:34:27,756 [INFO] signal-engine: [BTCUSDT] 冷启动完成: 加载459,517条历史数据 (窗口=4h)
+2026-03-02 00:34:30,633 [INFO] signal-engine: [ETHUSDT] 冷启动完成: 加载438,434条历史数据 (窗口=4h)
+2026-03-02 00:34:31,056 [INFO] signal-engine: [XRPUSDT] 冷启动完成: 加载64,941条历史数据 (窗口=4h)
+2026-03-02 00:34:31,510 [INFO] signal-engine: [SOLUSDT] 冷启动完成: 加载66,780条历史数据 (窗口=4h)
+2026-03-02 00:34:31,511 [INFO] signal-engine: === Signal Engine (PG) 启动完成 ===
+2026-03-02 00:34:31,763 [INFO] signal-engine: [BTCUSDT] 🚨 信号[v51_baseline]: LONG score=90 price=65953.9
+2026-03-02 00:34:31,763 [INFO] signal-engine: [BTCUSDT] 🚨 信号[v52_8signals]: LONG score=83 price=65953.9
+2026-03-02 00:34:32,046 [INFO] signal-engine: [ETHUSDT] 🚨 信号[v51_baseline]: LONG score=95 price=1945.0
+2026-03-02 00:34:32,046 [INFO] signal-engine: [ETHUSDT] 🚨 信号[v52_8signals]: LONG score=87 price=1945.0
+2026-03-02 00:34:32,138 [INFO] signal-engine: [XRPUSDT] 🚨 信号[v51_baseline]: LONG score=87 price=1.4
+2026-03-02 00:34:32,235 [INFO] signal-engine: [SOLUSDT] 🚨 信号[v51_baseline]: LONG score=92 price=83.8
+2026-03-02 00:34:32,236 [INFO] signal-engine: [SOLUSDT] 🚨 信号[v52_8signals]: LONG score=84 price=83.8
+2026-03-02 00:35:03,725 [INFO] signal-engine: 冷启动保护期结束，模拟盘开仓已启用
+2026-03-02 00:38:28,367 [INFO] signal-engine: [XRPUSDT] 🚨 信号[v52_8signals]: LONG score=75 price=1.4