fix: update initial trade logic

- Enable immediate trading attempt on startup
- Dynamic timeout calculation (remaining minutes - 10) for initial trade
- Added duplicate check for initial prediction saving to prevent DB errors

trading_log.json

@@ -18,5 +18,50 @@
     "probability": 0.0,
     "market": "Bitcoin Up or Down - February 11, 9AM ET",
     "market_slug": "bitcoin-up-or-down-february-11-9am-et"
+  },
+  {
+    "timestamp": "2026-02-11T23:18:40.579373",
+    "success": false,
+    "error": "该市场已存在成功交易记录",
+    "prediction": "UP",
+    "probability": 0.6666666666666666,
+    "market": "Bitcoin Up or Down - February 11, 10AM ET",
+    "market_slug": "bitcoin-up-or-down-february-11-10am-et"
+  },
+  {
+    "timestamp": "2026-02-11T23:18:59.059130",
+    "success": false,
+    "error": "该市场已存在成功交易记录",
+    "prediction": "UP",
+    "probability": 0.6666666666666666,
+    "market": "Bitcoin Up or Down - February 11, 10AM ET",
+    "market_slug": "bitcoin-up-or-down-february-11-10am-et"
+  },
+  {
+    "timestamp": "2026-02-11T23:19:50.797784",
+    "success": false,
+    "error": "该市场已存在成功交易记录",
+    "prediction": "UP",
+    "probability": 0.6666666666666666,
+    "market": "Bitcoin Up or Down - February 11, 10AM ET",
+    "market_slug": "bitcoin-up-or-down-february-11-10am-et"
+  },
+  {
+    "timestamp": "2026-02-11T23:31:03.776709",
+    "success": false,
+    "error": "该市场已存在成功交易记录",
+    "prediction": "UP",
+    "probability": 0.6666666666666666,
+    "market": "Bitcoin Up or Down - February 11, 10AM ET",
+    "market_slug": "bitcoin-up-or-down-february-11-10am-et"
+  },
+  {
+    "timestamp": "2026-02-11T23:35:39.565123",
+    "success": false,
+    "error": "该市场已存在成功交易记录",
+    "prediction": "UP",
+    "probability": 0.6666666666666666,
+    "market": "Bitcoin Up or Down - February 11, 10AM ET",
+    "market_slug": "bitcoin-up-or-down-february-11-10am-et"
   }
 ]