fix+perf: SQLite连接busy_timeout修复并发锁/静态版本号缓存/删除资产批量清理/安全检查最新记录子查询修正/AI余额与SSL探测并发化/密钥常量时间比较

app/services/asset_service.py

@@ -283,14 +283,19 @@ def delete_asset(session: Session, asset_id: int) -> None:
 
 
 def _cleanup_metrics_for_asset(asset_id: int) -> None:
-    """清理 metrics.db 中该资产的 MetricPoint/ServerInfo/SecurityCheck/EventLog"""
+    """清理 metrics.db 中该资产的 MetricPoint/ServerInfo/SecurityCheck/EventLog
+
+    使用批量 DELETE（而非逐行加载后删除）：监控时序数据可能上万行，
+    逐行删除会全部载入内存且产生数万次 ORM 操作。
+    """
+    from sqlmodel import delete
+
     from app.database import metrics_engine
     from app.models.monitor import EventLog, MetricPoint, SecurityCheck, ServerInfo
 
     with Session(metrics_engine) as ms:
         for model in (MetricPoint, ServerInfo, SecurityCheck, EventLog):
-            for row in ms.exec(select(model).where(model.asset_id == asset_id)).all():
-                ms.delete(row)
+            ms.exec(delete(model).where(model.asset_id == asset_id))
         ms.commit()