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/routers/monitor.py

@@ -7,7 +7,7 @@ from sqlmodel import Session, select
 
 from app.core.security import require_api_key
 from app.database import get_metrics_session
-from app.models.monitor import MetricPoint, SecurityCheck, ServerInfo
+from app.models.monitor import MetricPoint, ServerInfo
 from app.services import cleanup_service, security_service
 
 router = APIRouter(prefix="/api/monitor", tags=["monitor"])
@@ -55,18 +55,7 @@ def info(asset_id: int, session: Session = Depends(get_metrics_session)) -> Opti
 
 @router.get("/{asset_id}/security", summary="安全检查项（每项最新一条）")
 def security(asset_id: int, session: Session = Depends(get_metrics_session)):
-    stmt = (
-        select(SecurityCheck)
-        .where(SecurityCheck.asset_id == asset_id)
-        .order_by(SecurityCheck.ts.desc())
-        .limit(50)
-    )
-    checks = session.exec(stmt).all()
-    latest_by_item = {}
-    for check in checks:
-        if check.check_item not in latest_by_item:
-            latest_by_item[check.check_item] = check
-    return list(latest_by_item.values())
+    return security_service.latest_checks(session, asset_id)
 
 
 @router.get("/{asset_id}/security-score", summary="单个服务器安全评分与加固建议")