16337
63a8d5a8f2
Part A: 数据层
- 新增 WechatCardState 模型（order_id ↔ alarm_id 映射 + response_code）
- 新建 models_iot.py（IoT 工单只读 ORM：ops_order + security_ext + clean_ext）
- config.py 新增 IOT_DATABASE_URL 配置
Part B: 企微解耦（alarm_id → order_id）
- wechat_service: response_code 存储迁移到 wechat_card_state，集中 helper
- 卡片发送/更新方法改用 order_id，按钮 key: confirm_{order_id}
- wechat_callback: 按钮解析改 order_id，反查 alarm_id（可空）
- wechat_notify_api: send-card/sync-status 以 orderId 为主键
- yudao_aiot_alarm: 卡片操作改用 order_id，删重复 helper
Part C: Agent 工具全面改为工单驱动
- 新建 order_query.py（查 IoT ops_order，支持安保+保洁工单）
- 新建 order_action.py（操作工单状态 + 提交处理结果）
- 更新 prompts.py 为工单助手
- 更新工具注册（__init__.py）
Part D: 日报改为工单驱动
- daily_report_service 从查 alarm_event 改为查 IoT ops_order + 扩展表
- 支持安保+保洁工单统计
606 lines
24 KiB
Python
606 lines
24 KiB
Python
"""
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数据模型定义
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"""
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import enum
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import os
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from datetime import datetime, timezone
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from app.utils.timezone import beijing_now
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from typing import Optional
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from sqlalchemy import (
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Column, String, Integer, SmallInteger, BigInteger, Boolean, Float, DateTime, Text, Enum, JSON,
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ForeignKey, create_engine, Index
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)
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from sqlalchemy.orm import declarative_base, sessionmaker, relationship
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from sqlalchemy.pool import StaticPool
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from app.config import settings
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Base = declarative_base()
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# ==================== 枚举定义 ====================
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class AlertStatus(str, enum.Enum):
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"""告警状态"""
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PENDING = "pending" # 待处理
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CONFIRMED = "confirmed" # 已确认
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IGNORED = "ignored" # 已忽略
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RESOLVED = "resolved" # 已解决
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DISPATCHED = "dispatched" # 已派单
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class AlertLevel(str, enum.Enum):
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"""告警级别"""
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LOW = "low"
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MEDIUM = "medium"
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HIGH = "high"
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CRITICAL = "critical"
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class WorkOrderStatus(str, enum.Enum):
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"""工单状态"""
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CREATED = "created" # 已创建
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ASSIGNED = "assigned" # 已派发
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PROCESSING = "processing" # 处理中
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COMPLETED = "completed" # 已完成
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CLOSED = "closed" # 已关闭
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class WorkOrderPriority(str, enum.Enum):
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"""工单优先级"""
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LOW = "low"
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MEDIUM = "medium"
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HIGH = "high"
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URGENT = "urgent"
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class DeviceStatus(str, enum.Enum):
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"""设备状态"""
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ONLINE = "online"
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OFFLINE = "offline"
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ERROR = "error"
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# ==================== 数据模型 ====================
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class Alert(Base):
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"""告警表"""
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__tablename__ = "alerts"
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id = Column(Integer, primary_key=True, autoincrement=True)
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alert_no = Column(String(32), unique=True, nullable=False, index=True)
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# 来源信息
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camera_id = Column(String(64), nullable=False, index=True)
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roi_id = Column(String(64), nullable=True)
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bind_id = Column(String(64), nullable=True)
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device_id = Column(String(64), nullable=True, index=True)
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# 告警内容
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alert_type = Column(String(64), nullable=False)
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algorithm = Column(String(128), nullable=True)
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confidence = Column(Integer, nullable=True)
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duration_minutes = Column(Integer, nullable=True)
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trigger_time = Column(DateTime, nullable=False)
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message = Column(Text, nullable=True)
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bbox = Column(JSON, nullable=True)
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# 截图
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snapshot_url = Column(String(512), nullable=True)
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snapshot_path = Column(String(512), nullable=True)
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# 处理状态
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status = Column(Enum(AlertStatus), default=AlertStatus.PENDING, index=True)
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level = Column(Enum(AlertLevel), default=AlertLevel.MEDIUM)
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handle_remark = Column(Text, nullable=True)
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handled_by = Column(String(64), nullable=True)
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handled_at = Column(DateTime, nullable=True)
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# AI分析
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ai_analysis = Column(JSON, nullable=True)
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# 关联工单
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work_order_id = Column(Integer, ForeignKey("work_orders.id"), nullable=True)
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# 时间戳
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created_at = Column(DateTime, default=lambda: beijing_now())
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updated_at = Column(DateTime, default=lambda: beijing_now(),
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onupdate=lambda: beijing_now())
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# 关系
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work_order = relationship("WorkOrder", back_populates="alerts", foreign_keys=[work_order_id])
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__table_args__ = (
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Index('idx_alert_trigger_time', 'trigger_time'),
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Index('idx_alert_camera_status', 'camera_id', 'status'),
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)
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def to_dict(self) -> dict:
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return {
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"id": self.id,
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"alert_no": self.alert_no,
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"camera_id": self.camera_id,
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"roi_id": self.roi_id,
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"bind_id": self.bind_id,
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"device_id": self.device_id,
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"alert_type": self.alert_type,
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"algorithm": self.algorithm,
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"confidence": self.confidence,
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"duration_minutes": self.duration_minutes,
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"trigger_time": self.trigger_time.isoformat() if self.trigger_time else None,
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"message": self.message,
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"bbox": self.bbox,
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"snapshot_url": self.snapshot_url,
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"status": self.status.value if self.status else None,
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"level": self.level.value if self.level else None,
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"handle_remark": self.handle_remark,
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"handled_by": self.handled_by,
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"handled_at": self.handled_at.isoformat() if self.handled_at else None,
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"ai_analysis": self.ai_analysis,
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"work_order_id": self.work_order_id,
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"created_at": self.created_at.isoformat() if self.created_at else None,
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"updated_at": self.updated_at.isoformat() if self.updated_at else None,
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}
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class WorkOrder(Base):
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"""工单表"""
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__tablename__ = "work_orders"
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id = Column(Integer, primary_key=True, autoincrement=True)
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order_no = Column(String(32), unique=True, nullable=False, index=True)
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# 关联告警
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alert_id = Column(Integer, nullable=True)
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alert_no = Column(String(32), nullable=True)
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# 工单内容
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title = Column(String(255), nullable=False)
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description = Column(Text, nullable=True)
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priority = Column(Enum(WorkOrderPriority), default=WorkOrderPriority.MEDIUM)
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# 派发信息
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assignee_id = Column(String(64), nullable=True, index=True)
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assignee_name = Column(String(64), nullable=True)
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department = Column(String(64), nullable=True)
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# 状态
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status = Column(Enum(WorkOrderStatus), default=WorkOrderStatus.CREATED, index=True)
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# 处理结果
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result = Column(Text, nullable=True)
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attachments = Column(JSON, nullable=True)
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# 时间
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deadline = Column(DateTime, nullable=True)
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assigned_at = Column(DateTime, nullable=True)
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started_at = Column(DateTime, nullable=True)
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completed_at = Column(DateTime, nullable=True)
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created_at = Column(DateTime, default=lambda: beijing_now())
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updated_at = Column(DateTime, default=lambda: beijing_now(),
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onupdate=lambda: beijing_now())
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# 关系
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alerts = relationship("Alert", back_populates="work_order", foreign_keys=[Alert.work_order_id])
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def to_dict(self) -> dict:
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return {
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"id": self.id,
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"order_no": self.order_no,
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"alert_id": self.alert_id,
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"alert_no": self.alert_no,
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"title": self.title,
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"description": self.description,
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"priority": self.priority.value if self.priority else None,
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"assignee_id": self.assignee_id,
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"assignee_name": self.assignee_name,
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"department": self.department,
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"status": self.status.value if self.status else None,
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"result": self.result,
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"attachments": self.attachments,
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"deadline": self.deadline.isoformat() if self.deadline else None,
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"assigned_at": self.assigned_at.isoformat() if self.assigned_at else None,
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"started_at": self.started_at.isoformat() if self.started_at else None,
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"completed_at": self.completed_at.isoformat() if self.completed_at else None,
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"created_at": self.created_at.isoformat() if self.created_at else None,
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"updated_at": self.updated_at.isoformat() if self.updated_at else None,
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}
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class EdgeDevice(Base):
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"""边缘设备表"""
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__tablename__ = "edge_devices"
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id = Column(Integer, primary_key=True, autoincrement=True)
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device_id = Column(String(64), unique=True, nullable=False, index=True)
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device_name = Column(String(128), nullable=True)
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# 状态
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status = Column(Enum(DeviceStatus), default=DeviceStatus.OFFLINE, index=True)
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last_heartbeat = Column(DateTime, nullable=True)
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# 运行信息
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uptime_seconds = Column(BigInteger, nullable=True)
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frames_processed = Column(BigInteger, nullable=True)
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alerts_generated = Column(BigInteger, nullable=True)
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# 配置
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ip_address = Column(String(45), nullable=True)
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stream_count = Column(Integer, nullable=True)
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config_version = Column(String(32), nullable=True)
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# 扩展
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extra_info = Column(JSON, nullable=True)
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created_at = Column(DateTime, default=lambda: beijing_now())
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updated_at = Column(DateTime, default=lambda: beijing_now(),
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onupdate=lambda: beijing_now())
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def to_dict(self) -> dict:
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return {
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"id": self.id,
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"device_id": self.device_id,
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"device_name": self.device_name,
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"status": self.status.value if self.status else None,
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"last_heartbeat": self.last_heartbeat.isoformat() if self.last_heartbeat else None,
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"uptime_seconds": self.uptime_seconds,
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"frames_processed": self.frames_processed,
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"alerts_generated": self.alerts_generated,
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"ip_address": self.ip_address,
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"stream_count": self.stream_count,
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"config_version": self.config_version,
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"extra_info": self.extra_info,
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"created_at": self.created_at.isoformat() if self.created_at else None,
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"updated_at": self.updated_at.isoformat() if self.updated_at else None,
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}
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# ==================== 新告警三表结构 ====================
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class AlarmEvent(Base):
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"""告警事件主表"""
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__tablename__ = "alarm_event"
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alarm_id = Column(String(64), primary_key=True, comment="分布式告警ID")
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alarm_type = Column(String(32), nullable=False, comment="告警类型")
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algorithm_code = Column(String(64), comment="算法编码")
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device_id = Column(String(64), nullable=False, comment="摄像头/设备ID")
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scene_id = Column(String(64), comment="场景/ROI ID")
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event_time = Column(DateTime, nullable=False, comment="事件发生时间")
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first_frame_time = Column(DateTime, comment="首帧时间")
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last_frame_time = Column(DateTime, comment="末帧时间")
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duration_ms = Column(Integer, comment="持续时长(毫秒)")
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alarm_level = Column(SmallInteger, comment="告警级别: 0紧急 1重要 2普通 3轻微")
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confidence_score = Column(Float, comment="置信度 0-1")
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alarm_status = Column(String(20), default="NEW", comment="告警状态: NEW/CONFIRMED/FALSE/CLOSED")
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handle_status = Column(String(20), default="UNHANDLED", comment="处理状态: UNHANDLED/HANDLING/DONE")
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snapshot_url = Column(String(512), comment="截图URL")
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video_url = Column(String(512), comment="视频URL")
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edge_node_id = Column(String(64), comment="边缘节点ID")
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area_id = Column(BigInteger, comment="所属区域ID")
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handler = Column(String(64), comment="处理人")
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handle_remark = Column(Text, comment="处理备注")
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handled_at = Column(DateTime, comment="处理时间")
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created_at = Column(DateTime, default=lambda: beijing_now())
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updated_at = Column(DateTime, default=lambda: beijing_now(),
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onupdate=lambda: beijing_now())
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__table_args__ = (
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Index('idx_alarm_event_time', 'event_time'),
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Index('idx_alarm_device_type', 'device_id', 'alarm_type'),
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)
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def to_dict(self) -> dict:
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return {
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"alarm_id": self.alarm_id,
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"alarm_type": self.alarm_type,
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"algorithm_code": self.algorithm_code,
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"device_id": self.device_id,
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"scene_id": self.scene_id,
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"event_time": self.event_time.strftime('%Y-%m-%d %H:%M:%S') if self.event_time else None,
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"first_frame_time": self.first_frame_time.strftime('%Y-%m-%d %H:%M:%S') if self.first_frame_time else None,
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"last_frame_time": self.last_frame_time.strftime('%Y-%m-%d %H:%M:%S') if self.last_frame_time else None,
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"duration_ms": self.duration_ms,
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"alarm_level": self.alarm_level,
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"confidence_score": self.confidence_score,
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"alarm_status": self.alarm_status,
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"handle_status": self.handle_status,
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"snapshot_url": self.snapshot_url,
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"video_url": self.video_url,
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"edge_node_id": self.edge_node_id,
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"area_id": self.area_id,
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"handler": self.handler,
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"handle_remark": self.handle_remark,
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"handled_at": self.handled_at.strftime('%Y-%m-%d %H:%M:%S') if self.handled_at else None,
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"created_at": self.created_at.strftime('%Y-%m-%d %H:%M:%S') if self.created_at else None,
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"updated_at": self.updated_at.strftime('%Y-%m-%d %H:%M:%S') if self.updated_at else None,
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}
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class AlarmEventExt(Base):
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"""告警事件扩展表（算法结果详情）"""
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__tablename__ = "alarm_event_ext"
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id = Column(Integer, primary_key=True, autoincrement=True)
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alarm_id = Column(String(64), nullable=False, index=True, comment="关联告警ID")
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ext_type = Column(String(32), comment="扩展类型: EDGE/POST/MANUAL")
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ext_data = Column(JSON, comment="扩展数据")
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roi_config = Column(JSON, comment="ROI配置快照")
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created_at = Column(DateTime, default=lambda: beijing_now())
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def to_dict(self) -> dict:
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return {
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"id": self.id,
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"alarm_id": self.alarm_id,
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"ext_type": self.ext_type,
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"ext_data": self.ext_data,
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"roi_config": self.roi_config,
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"created_at": self.created_at.isoformat() if self.created_at else None,
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}
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class AlarmLlmAnalysis(Base):
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"""告警大模型分析表"""
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__tablename__ = "alarm_llm_analysis"
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id = Column(Integer, primary_key=True, autoincrement=True)
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alarm_id = Column(String(64), nullable=False, index=True, comment="关联告警ID")
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llm_model = Column(String(32), comment="模型名称")
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analysis_type = Column(String(20), comment="分析类型: REVIEW/EXPLAIN/RISK")
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summary = Column(Text, comment="分析摘要")
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is_false_alarm = Column(Boolean, comment="是否误报")
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risk_score = Column(Integer, comment="风险评分 0-100")
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confidence_score = Column(Float, comment="分析置信度")
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suggestion = Column(Text, comment="处置建议")
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created_at = Column(DateTime, default=lambda: beijing_now())
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def to_dict(self) -> dict:
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return {
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"id": self.id,
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"alarm_id": self.alarm_id,
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"llm_model": self.llm_model,
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"analysis_type": self.analysis_type,
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"summary": self.summary,
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"is_false_alarm": self.is_false_alarm,
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"risk_score": self.risk_score,
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"confidence_score": self.confidence_score,
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"suggestion": self.suggestion,
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"created_at": self.created_at.isoformat() if self.created_at else None,
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}
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# ==================== 工单体系 ====================
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class SecurityUser(Base):
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"""安保人员表"""
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__tablename__ = "security_user"
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id = Column(Integer, primary_key=True, autoincrement=True)
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user_id = Column(String(64), unique=True, nullable=False, index=True, comment="人员唯一ID")
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name = Column(String(100), nullable=False, comment="姓名")
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phone = Column(String(20), nullable=True, comment="手机号")
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wechat_uid = Column(String(100), nullable=True, comment="企微userid")
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role = Column(String(50), default="guard", comment="角色: guard/supervisor/manager")
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team_id = Column(String(64), nullable=True, index=True, comment="班组ID")
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status = Column(String(20), default="active", comment="状态: active/inactive")
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created_at = Column(DateTime, default=lambda: beijing_now())
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updated_at = Column(DateTime, default=lambda: beijing_now(),
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onupdate=lambda: beijing_now())
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def to_dict(self) -> dict:
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fmt = '%Y-%m-%d %H:%M:%S'
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return {
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"id": self.id,
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"user_id": self.user_id,
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"name": self.name,
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"phone": self.phone,
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"wechat_uid": self.wechat_uid,
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"role": self.role,
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"team_id": self.team_id,
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"status": self.status,
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"created_at": self.created_at.strftime(fmt) if self.created_at else None,
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"updated_at": self.updated_at.strftime(fmt) if self.updated_at else None,
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}
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class SecurityWorkOrder(Base):
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"""安保工单表"""
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__tablename__ = "security_work_order"
|
||
|
||
order_id = Column(String(64), primary_key=True, comment="工单ID: WO + 时间戳 + uuid")
|
||
|
||
# 来源告警（告警工单必填，手动工单可空）
|
||
alarm_id = Column(String(64), nullable=True, unique=True, comment="关联 alarm_event.alarm_id")
|
||
|
||
# 工单内容
|
||
title = Column(String(200), nullable=False, comment="工单标题")
|
||
description = Column(Text, nullable=True, comment="工单描述")
|
||
priority = Column(SmallInteger, default=2, comment="优先级: 1低 2中 3高 4紧急")
|
||
|
||
# 设备/区域信息（冗余，方便查询和责任追溯）
|
||
camera_id = Column(String(64), nullable=True, comment="摄像头ID")
|
||
roi_id = Column(String(64), nullable=True, comment="ROI区域ID")
|
||
alarm_type = Column(String(50), nullable=True, comment="告警类型")
|
||
image_url = Column(String(512), nullable=True, comment="截图URL")
|
||
|
||
# 派发信息（写入时确定，不依赖实时查询，确保责任可追溯）
|
||
assigned_user_id = Column(String(64), nullable=True, index=True, comment="处理人user_id")
|
||
assigned_user_name = Column(String(100), nullable=True, comment="处理人姓名")
|
||
assigned_team_id = Column(String(64), nullable=True, comment="班组ID")
|
||
|
||
# 状态: PENDING / DISPATCHED / PROCESSING / DONE / CLOSED
|
||
status = Column(String(20), default="PENDING", nullable=False, index=True, comment="工单状态")
|
||
|
||
# 处理结果
|
||
result = Column(Text, nullable=True, comment="处理结果描述")
|
||
|
||
# 创建人
|
||
created_by = Column(String(64), nullable=True, comment="创建人")
|
||
|
||
# 时间
|
||
created_at = Column(DateTime, default=lambda: beijing_now())
|
||
updated_at = Column(DateTime, default=lambda: beijing_now(),
|
||
onupdate=lambda: beijing_now())
|
||
dispatch_time = Column(DateTime, nullable=True, comment="派单时间")
|
||
finish_time = Column(DateTime, nullable=True, comment="完成时间")
|
||
|
||
__table_args__ = (
|
||
Index('idx_swo_status', 'status'),
|
||
Index('idx_swo_assigned', 'assigned_user_id'),
|
||
Index('idx_swo_created_at', 'created_at'),
|
||
Index('idx_swo_camera_roi_type', 'camera_id', 'roi_id', 'alarm_type'),
|
||
)
|
||
|
||
def to_dict(self) -> dict:
|
||
fmt = '%Y-%m-%d %H:%M:%S'
|
||
return {
|
||
"order_id": self.order_id,
|
||
"alarm_id": self.alarm_id,
|
||
"title": self.title,
|
||
"description": self.description,
|
||
"priority": self.priority,
|
||
"camera_id": self.camera_id,
|
||
"roi_id": self.roi_id,
|
||
"alarm_type": self.alarm_type,
|
||
"image_url": self.image_url,
|
||
"assigned_user_id": self.assigned_user_id,
|
||
"assigned_user_name": self.assigned_user_name,
|
||
"assigned_team_id": self.assigned_team_id,
|
||
"status": self.status,
|
||
"result": self.result,
|
||
"created_by": self.created_by,
|
||
"created_at": self.created_at.strftime(fmt) if self.created_at else None,
|
||
"updated_at": self.updated_at.strftime(fmt) if self.updated_at else None,
|
||
"dispatch_time": self.dispatch_time.strftime(fmt) if self.dispatch_time else None,
|
||
"finish_time": self.finish_time.strftime(fmt) if self.finish_time else None,
|
||
}
|
||
|
||
|
||
class WorkOrderLog(Base):
|
||
"""工单操作记录表"""
|
||
__tablename__ = "work_order_log"
|
||
|
||
id = Column(Integer, primary_key=True, autoincrement=True)
|
||
order_id = Column(String(64), nullable=False, index=True, comment="关联工单ID")
|
||
action = Column(String(50), nullable=False,
|
||
comment="操作: CREATE/DISPATCH/ACCEPT/FINISH/CLOSE")
|
||
operator_id = Column(String(64), nullable=True, comment="操作人ID")
|
||
operator_name = Column(String(100), nullable=True, comment="操作人姓名")
|
||
remark = Column(Text, nullable=True, comment="备注")
|
||
created_at = Column(DateTime, default=lambda: beijing_now())
|
||
|
||
def to_dict(self) -> dict:
|
||
return {
|
||
"id": self.id,
|
||
"order_id": self.order_id,
|
||
"action": self.action,
|
||
"operator_id": self.operator_id,
|
||
"operator_name": self.operator_name,
|
||
"remark": self.remark,
|
||
"created_at": self.created_at.strftime('%Y-%m-%d %H:%M:%S') if self.created_at else None,
|
||
}
|
||
|
||
|
||
# ==================== 数据库管理 ====================
|
||
|
||
_engine = None
|
||
_SessionLocal = None
|
||
|
||
|
||
def get_engine():
|
||
global _engine
|
||
if _engine is None:
|
||
db_url = settings.database.url
|
||
connect_args = {}
|
||
if "sqlite" in db_url:
|
||
db_path = db_url.replace("sqlite:///", "")
|
||
os.makedirs(os.path.dirname(db_path) if os.path.dirname(db_path) else ".", exist_ok=True)
|
||
connect_args = {"check_same_thread": False}
|
||
_engine = create_engine(
|
||
db_url,
|
||
echo=settings.app.debug,
|
||
poolclass=StaticPool if "sqlite" in db_url else None,
|
||
connect_args=connect_args,
|
||
)
|
||
else:
|
||
_engine = create_engine(
|
||
db_url,
|
||
echo=settings.app.debug,
|
||
pool_recycle=1800,
|
||
pool_pre_ping=True,
|
||
)
|
||
return _engine
|
||
|
||
|
||
def get_session():
|
||
global _SessionLocal
|
||
if _SessionLocal is None:
|
||
_SessionLocal = sessionmaker(bind=get_engine(), autocommit=False, autoflush=False)
|
||
return _SessionLocal()
|
||
|
||
|
||
def init_db():
|
||
engine = get_engine()
|
||
Base.metadata.create_all(bind=engine)
|
||
|
||
|
||
class NotifyArea(Base):
|
||
"""通知区域"""
|
||
__tablename__ = "notify_area"
|
||
|
||
id = Column(Integer, primary_key=True, autoincrement=True)
|
||
area_id = Column(String(36), unique=True, nullable=False, index=True)
|
||
area_name = Column(String(100), nullable=False)
|
||
description = Column(String(200), nullable=True)
|
||
enabled = Column(SmallInteger, default=1)
|
||
created_at = Column(DateTime, default=beijing_now)
|
||
updated_at = Column(DateTime, default=beijing_now, onupdate=beijing_now)
|
||
|
||
|
||
class CameraAreaBinding(Base):
|
||
"""摄像头-区域映射"""
|
||
__tablename__ = "camera_area_binding"
|
||
|
||
id = Column(Integer, primary_key=True, autoincrement=True)
|
||
camera_id = Column(String(64), unique=True, nullable=False, index=True)
|
||
area_id = Column(String(36), nullable=False, index=True)
|
||
created_at = Column(DateTime, default=beijing_now)
|
||
|
||
|
||
class WechatCardState(Base):
|
||
"""企微卡片状态表（order_id ↔ alarm_id 映射 + response_code）"""
|
||
__tablename__ = "wechat_card_state"
|
||
|
||
order_id = Column(String(64), primary_key=True, comment="IoT工单ID(ops_order.id)")
|
||
response_code = Column(String(255), nullable=True, comment="企微卡片 response_code")
|
||
alarm_id = Column(String(64), nullable=True, comment="关联告警ID（可空）")
|
||
created_at = Column(DateTime, default=lambda: beijing_now())
|
||
updated_at = Column(DateTime, default=lambda: beijing_now(),
|
||
onupdate=lambda: beijing_now())
|
||
|
||
|
||
class AreaPersonBinding(Base):
|
||
"""区域-人员通知绑定"""
|
||
__tablename__ = "area_person_binding"
|
||
|
||
id = Column(Integer, primary_key=True, autoincrement=True)
|
||
area_id = Column(String(36), nullable=False, index=True)
|
||
person_name = Column(String(50), nullable=False)
|
||
wechat_uid = Column(String(100), nullable=False)
|
||
role = Column(String(20), default="SECURITY")
|
||
notify_level = Column(Integer, default=1)
|
||
enabled = Column(SmallInteger, default=1)
|
||
created_at = Column(DateTime, default=beijing_now)
|
||
updated_at = Column(DateTime, default=beijing_now, onupdate=beijing_now)
|
||
|
||
|
||
# ==================== 数据库管理 ====================
|
||
|
||
def close_db():
|
||
global _engine, _SessionLocal
|
||
if _engine:
|
||
_engine.dispose()
|
||
_engine = None
|
||
_SessionLocal = None
|