PingWatch 网络设备离线监控系统

- FastAPI 后端 + Vue 3 前端
- Docker Compose 一键部署
- Casdoor OAuth 认证集成
- LogHive 集中式日志
- 设备批量 CSV 导入/导出
- WebSocket 实时状态推送
- 企业微信告警通知
- fping 高性能并发 Ping 检测

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/app/schemas/stats.py

@@ -0,0 +1,40 @@
+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel
+
+
+class DeviceStatusSummary(BaseModel):
+    total: int
+    online: int
+    offline: int
+    checking: int
+    unknown: int
+    online_rate: float
+
+
+class DeviceStatsItem(BaseModel):
+    device_id: int
+    device_name: str
+    device_ip: str
+    device_type: str
+    location: str
+    project_name: str
+    total_pings: int
+    alive_pings: int
+    packet_loss_rate: float
+    avg_response_time: Optional[float] = None
+    offline_count: int
+    total_offline_duration: int  # 分钟
+    max_offline_duration: int
+
+
+class TimeSeriesPoint(BaseModel):
+    time: datetime
+    value: float
+
+
+class DashboardStats(BaseModel):
+    summary: DeviceStatusSummary
+    recent_offline: list  # list[AlertEventOut]
+    offline_trend: list[TimeSeriesPoint]
+    packet_loss_top: list[DeviceStatsItem]