fix: add /api/signals/history endpoint

backend/main.py

@@ -211,6 +211,22 @@ async def get_kline(symbol: str = "BTC", interval: str = "5m", limit: int = 500)
     return {"symbol": symbol, "interval": interval, "count": len(data), "data": data}
 
 
+@app.get("/api/signals/history")
+async def get_signals_history(limit: int = 100):
+    """查询信号推送历史"""
+    try:
+        conn = sqlite3.connect(DB_PATH)
+        conn.row_factory = sqlite3.Row
+        rows = conn.execute(
+            "SELECT id, symbol, rate, annualized, sent_at, message FROM signal_logs ORDER BY sent_at DESC LIMIT ?",
+            (limit,)
+        ).fetchall()
+        conn.close()
+        return {"items": [dict(r) for r in rows]}
+    except Exception as e:
+        return {"items": [], "error": str(e)}
+
+
 @app.get("/api/history")
 async def get_history():
     cached = get_cache("history", 60)