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/models/alert_event.py

@@ -0,0 +1,34 @@
+import enum
+from datetime import datetime
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, BigInteger, Enum
+from .device import Base
+
+
+class AlertTypeEnum(str, enum.Enum):
+    offline = "offline"           # 设备离线
+    recovered = "recovered"       # 设备恢复
+    system = "system"             # 系统告警（如上游断网检测）
+
+
+class AlertEvent(Base):
+    """告警事件表"""
+    __tablename__ = "alert_events"
+
+    id = Column(BigInteger, primary_key=True, autoincrement=True)
+    device_id = Column(Integer, nullable=False, index=True, comment="关联设备 ID")
+    alert_type = Column(Enum(AlertTypeEnum), nullable=False, comment="告警类型")
+    message = Column(String(1024), default="", comment="告警消息摘要")
+
+    # 离线起止
+    start_at = Column(DateTime, nullable=False, comment="离线开始时间")
+    end_at = Column(DateTime, nullable=True, comment="恢复时间")
+    duration_minutes = Column(Integer, nullable=True, comment="离线时长（分钟）")
+
+    is_resolved = Column(Boolean, default=False, comment="是否已恢复")
+    notification_sent = Column(Boolean, default=False, comment="是否已发送通知")
+    acknowledged_at = Column(DateTime, nullable=True, comment="用户确认时间")
+
+    created_at = Column(DateTime, default=datetime.now, comment="创建时间")
+
+    def __repr__(self):
+        return f"<AlertEvent(id={self.id}, device={self.device_id}, type={self.alert_type})>"