feat(alert): 异常浮窗数据源改为broadcast_messages的system_error类(24h,统一消息源)

server.py

@@ -239,6 +239,37 @@ def index():
     return resp
 
 
+def _get_recent_error_alerts(hours=24, limit=10):
+    """从 broadcast_messages 读取24小时内的 system_error 类消息作为异常浮窗数据源。
+    统一消息源：broadcast 是唯一消息源，异常浮窗=其中的 system_error 类展示。"""
+    import sqlite3 as _sq
+    from datetime import datetime, timedelta
+    try:
+        conn = _sq.connect("/home/hmo/MoFin/data/mofin.db", timeout=30)
+        conn.row_factory = _sq.Row
+        since = (datetime.now() - timedelta(hours=hours)).isoformat()
+        rows = conn.execute(
+            "SELECT ts, title, content, source, category FROM broadcast_messages "
+            "WHERE category='system_error' AND ts >= ? ORDER BY ts DESC LIMIT ?",
+            (since, limit)).fetchall()
+        conn.close()
+        result = []
+        for r in rows:
+            ts = r["ts"] or ""
+            result.append({
+                "ts": 0,
+                "ts_str": ts[:19].replace("T", " "),
+                "level": "error",
+                "source": r["source"] or "system",
+                "title": r["title"] or "",
+                "detail": r["content"] or "",
+                "code": "",
+            })
+        return result
+    except Exception:
+        return _load_json(DATA_DIR / "alerts.json", [])[:limit]
+
+
 @app.route("/api/watch")
 def get_watch():
     """盯盘：所有有效策略（持仓+自选），服务端排序"""
@@ -1063,7 +1094,8 @@ def api_overview():
                 "total_assets": total_assets, "stock_value": stock_value,
                 "cash": cash, "position_pct": position_pct, "total_pnl": total_pnl,
                 "top_movers": top_movers, "market": market,
-                "alerts": _load_json(DATA_DIR / "alerts.json", [])[:10],
+                # 异常浮窗数据源：broadcast_messages 的 system_error 类（24小时内）
+                "alerts": _get_recent_error_alerts(24),
                 # 2026-08-13 温区自适应：概览页横幅数据源
                 "regime_weights": _load_json(DATA_DIR / "strategy_weights.json", None),
                 "updated_at": summary.get("updated_at", ""),