diff --git a/app/models.py b/app/models.py
index 7cf8442..191eea7 100644
--- a/app/models.py
+++ b/app/models.py
@@ -1,8 +1,15 @@
+"""
+数据模型定义
+"""
 import enum
+import os
 from datetime import datetime, timezone
 from typing import Optional
-from sqlalchemy import Column, String, Integer, DateTime, Text, Enum, JSON, create_engine
-from sqlalchemy.orm import declarative_base, sessionmaker
+from sqlalchemy import (
+    Column, String, Integer, BigInteger, DateTime, Text, Enum, JSON,
+    ForeignKey, create_engine, Index
+)
+from sqlalchemy.orm import declarative_base, sessionmaker, relationship
 from sqlalchemy.pool import StaticPool
 
 from app.config import settings
@@ -10,47 +17,102 @@ from app.config import settings
 Base = declarative_base()
 
 
+# ==================== 枚举定义 ====================
+
 class AlertStatus(str, enum.Enum):
-    PENDING = "pending"
-    CONFIRMED = "confirmed"
-    IGNORED = "ignored"
-    RESOLVED = "resolved"
+    """告警状态"""
+    PENDING = "pending"          # 待处理
+    CONFIRMED = "confirmed"      # 已确认
+    IGNORED = "ignored"          # 已忽略
+    RESOLVED = "resolved"        # 已解决
+    DISPATCHED = "dispatched"    # 已派单
 
 
 class AlertLevel(str, enum.Enum):
+    """告警级别"""
     LOW = "low"
     MEDIUM = "medium"
     HIGH = "high"
     CRITICAL = "critical"
 
 
+class WorkOrderStatus(str, enum.Enum):
+    """工单状态"""
+    CREATED = "created"          # 已创建
+    ASSIGNED = "assigned"        # 已派发
+    PROCESSING = "processing"    # 处理中
+    COMPLETED = "completed"      # 已完成
+    CLOSED = "closed"            # 已关闭
+
+
+class WorkOrderPriority(str, enum.Enum):
+    """工单优先级"""
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+    URGENT = "urgent"
+
+
+class DeviceStatus(str, enum.Enum):
+    """设备状态"""
+    ONLINE = "online"
+    OFFLINE = "offline"
+    ERROR = "error"
+
+
+# ==================== 数据模型 ====================
+
 class Alert(Base):
+    """告警表"""
     __tablename__ = "alerts"
 
     id = Column(Integer, primary_key=True, autoincrement=True)
     alert_no = Column(String(32), unique=True, nullable=False, index=True)
 
+    # 来源信息
     camera_id = Column(String(64), nullable=False, index=True)
     roi_id = Column(String(64), nullable=True)
+    bind_id = Column(String(64), nullable=True)
+    device_id = Column(String(64), nullable=True, index=True)
+
+    # 告警内容
     alert_type = Column(String(64), nullable=False)
     algorithm = Column(String(128), nullable=True)
     confidence = Column(Integer, nullable=True)
     duration_minutes = Column(Integer, nullable=True)
     trigger_time = Column(DateTime, nullable=False)
     message = Column(Text, nullable=True)
+    bbox = Column(JSON, nullable=True)
 
+    # 截图
     snapshot_url = Column(String(512), nullable=True)
     snapshot_path = Column(String(512), nullable=True)
 
-    status = Column(Enum(AlertStatus), default=AlertStatus.PENDING)
+    # 处理状态
+    status = Column(Enum(AlertStatus), default=AlertStatus.PENDING, index=True)
+    level = Column(Enum(AlertLevel), default=AlertLevel.MEDIUM)
     handle_remark = Column(Text, nullable=True)
     handled_by = Column(String(64), nullable=True)
     handled_at = Column(DateTime, nullable=True)
 
+    # AI分析
     ai_analysis = Column(JSON, nullable=True)
 
+    # 关联工单
+    work_order_id = Column(Integer, ForeignKey("work_orders.id"), nullable=True)
+
+    # 时间戳
     created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
-    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
+    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc),
+                        onupdate=lambda: datetime.now(timezone.utc))
+
+    # 关系
+    work_order = relationship("WorkOrder", back_populates="alerts", foreign_keys=[work_order_id])
+
+    __table_args__ = (
+        Index('idx_alert_trigger_time', 'trigger_time'),
+        Index('idx_alert_camera_status', 'camera_id', 'status'),
+    )
 
     def to_dict(self) -> dict:
         return {
@@ -58,23 +120,142 @@ class Alert(Base):
             "alert_no": self.alert_no,
             "camera_id": self.camera_id,
             "roi_id": self.roi_id,
+            "bind_id": self.bind_id,
+            "device_id": self.device_id,
             "alert_type": self.alert_type,
             "algorithm": self.algorithm,
             "confidence": self.confidence,
             "duration_minutes": self.duration_minutes,
             "trigger_time": self.trigger_time.isoformat() if self.trigger_time else None,
             "message": self.message,
+            "bbox": self.bbox,
             "snapshot_url": self.snapshot_url,
             "status": self.status.value if self.status else None,
+            "level": self.level.value if self.level else None,
             "handle_remark": self.handle_remark,
             "handled_by": self.handled_by,
             "handled_at": self.handled_at.isoformat() if self.handled_at else None,
             "ai_analysis": self.ai_analysis,
+            "work_order_id": self.work_order_id,
             "created_at": self.created_at.isoformat() if self.created_at else None,
             "updated_at": self.updated_at.isoformat() if self.updated_at else None,
         }
 
 
+class WorkOrder(Base):
+    """工单表"""
+    __tablename__ = "work_orders"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    order_no = Column(String(32), unique=True, nullable=False, index=True)
+
+    # 关联告警
+    alert_id = Column(Integer, nullable=True)
+    alert_no = Column(String(32), nullable=True)
+
+    # 工单内容
+    title = Column(String(255), nullable=False)
+    description = Column(Text, nullable=True)
+    priority = Column(Enum(WorkOrderPriority), default=WorkOrderPriority.MEDIUM)
+
+    # 派发信息
+    assignee_id = Column(String(64), nullable=True, index=True)
+    assignee_name = Column(String(64), nullable=True)
+    department = Column(String(64), nullable=True)
+
+    # 状态
+    status = Column(Enum(WorkOrderStatus), default=WorkOrderStatus.CREATED, index=True)
+
+    # 处理结果
+    result = Column(Text, nullable=True)
+    attachments = Column(JSON, nullable=True)
+
+    # 时间
+    deadline = Column(DateTime, nullable=True)
+    assigned_at = Column(DateTime, nullable=True)
+    started_at = Column(DateTime, nullable=True)
+    completed_at = Column(DateTime, nullable=True)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc),
+                        onupdate=lambda: datetime.now(timezone.utc))
+
+    # 关系
+    alerts = relationship("Alert", back_populates="work_order", foreign_keys=[Alert.work_order_id])
+
+    def to_dict(self) -> dict:
+        return {
+            "id": self.id,
+            "order_no": self.order_no,
+            "alert_id": self.alert_id,
+            "alert_no": self.alert_no,
+            "title": self.title,
+            "description": self.description,
+            "priority": self.priority.value if self.priority else None,
+            "assignee_id": self.assignee_id,
+            "assignee_name": self.assignee_name,
+            "department": self.department,
+            "status": self.status.value if self.status else None,
+            "result": self.result,
+            "attachments": self.attachments,
+            "deadline": self.deadline.isoformat() if self.deadline else None,
+            "assigned_at": self.assigned_at.isoformat() if self.assigned_at else None,
+            "started_at": self.started_at.isoformat() if self.started_at else None,
+            "completed_at": self.completed_at.isoformat() if self.completed_at else None,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
+        }
+
+
+class EdgeDevice(Base):
+    """边缘设备表"""
+    __tablename__ = "edge_devices"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    device_id = Column(String(64), unique=True, nullable=False, index=True)
+    device_name = Column(String(128), nullable=True)
+
+    # 状态
+    status = Column(Enum(DeviceStatus), default=DeviceStatus.OFFLINE, index=True)
+    last_heartbeat = Column(DateTime, nullable=True)
+
+    # 运行信息
+    uptime_seconds = Column(BigInteger, nullable=True)
+    frames_processed = Column(BigInteger, nullable=True)
+    alerts_generated = Column(BigInteger, nullable=True)
+
+    # 配置
+    ip_address = Column(String(45), nullable=True)
+    stream_count = Column(Integer, nullable=True)
+    config_version = Column(String(32), nullable=True)
+
+    # 扩展
+    extra_info = Column(JSON, nullable=True)
+
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc),
+                        onupdate=lambda: datetime.now(timezone.utc))
+
+    def to_dict(self) -> dict:
+        return {
+            "id": self.id,
+            "device_id": self.device_id,
+            "device_name": self.device_name,
+            "status": self.status.value if self.status else None,
+            "last_heartbeat": self.last_heartbeat.isoformat() if self.last_heartbeat else None,
+            "uptime_seconds": self.uptime_seconds,
+            "frames_processed": self.frames_processed,
+            "alerts_generated": self.alerts_generated,
+            "ip_address": self.ip_address,
+            "stream_count": self.stream_count,
+            "config_version": self.config_version,
+            "extra_info": self.extra_info,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
+        }
+
+
+# ==================== 数据库管理 ====================
+
 _engine = None
 _SessionLocal = None