feat(aiot): 告警三表结构升级 + 腾讯云COS对象存储集成

1. 新增三表结构: alarm_event(主表), alarm_event_ext(算法扩展), alarm_llm_analysis(大模型分析)
2. 新增 AlarmEventService 服务，支持 MQTT/HTTP 双路创建告警
3. MQTT handler 双写新旧表，平滑过渡
4. 重写 yudao_aiot_alarm 路由，对接新告警服务
5. 集成腾讯云 COS 对象存储：上传、预签名URL、STS临时凭证
6. 新增 storage 路由：upload/presign/upload-url/sts 四个接口
7. COS 未启用时自动降级本地 uploads/ 目录存储
8. 新增数据迁移脚本 migrate_to_alarm_event.py
9. 删除根目录 main.py（非项目入口）

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/models.py

@@ -6,7 +6,7 @@ import os
 from datetime import datetime, timezone
 from typing import Optional
 from sqlalchemy import (
-    Column, String, Integer, BigInteger, DateTime, Text, Enum, JSON,
+    Column, String, Integer, SmallInteger, BigInteger, Boolean, Float, DateTime, Text, Enum, JSON,
     ForeignKey, create_engine, Index
 )
 from sqlalchemy.orm import declarative_base, sessionmaker, relationship
@@ -254,6 +254,118 @@ class EdgeDevice(Base):
         }
 
 
+# ==================== 新告警三表结构 ====================
+
+class AlarmEvent(Base):
+    """告警事件主表"""
+    __tablename__ = "alarm_event"
+
+    alarm_id = Column(String(64), primary_key=True, comment="分布式告警ID")
+    alarm_type = Column(String(32), nullable=False, comment="告警类型")
+    algorithm_code = Column(String(64), comment="算法编码")
+    device_id = Column(String(64), nullable=False, comment="摄像头/设备ID")
+    scene_id = Column(String(64), comment="场景/ROI ID")
+    event_time = Column(DateTime, nullable=False, comment="事件发生时间")
+    first_frame_time = Column(DateTime, comment="首帧时间")
+    last_frame_time = Column(DateTime, comment="末帧时间")
+    duration_ms = Column(Integer, comment="持续时长(毫秒)")
+    alarm_level = Column(SmallInteger, comment="告警级别: 1提醒 2一般 3严重 4紧急")
+    confidence_score = Column(Float, comment="置信度 0-1")
+    alarm_status = Column(String(20), default="NEW", comment="告警状态: NEW/CONFIRMED/FALSE/CLOSED")
+    handle_status = Column(String(20), default="UNHANDLED", comment="处理状态: UNHANDLED/HANDLING/DONE")
+    snapshot_url = Column(String(512), comment="截图URL")
+    video_url = Column(String(512), comment="视频URL")
+    edge_node_id = Column(String(64), comment="边缘节点ID")
+    handler = Column(String(64), comment="处理人")
+    handle_remark = Column(Text, comment="处理备注")
+    handled_at = Column(DateTime, comment="处理时间")
+    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))
+
+    __table_args__ = (
+        Index('idx_alarm_event_time', 'event_time'),
+        Index('idx_alarm_device_type', 'device_id', 'alarm_type'),
+    )
+
+    def to_dict(self) -> dict:
+        return {
+            "alarm_id": self.alarm_id,
+            "alarm_type": self.alarm_type,
+            "algorithm_code": self.algorithm_code,
+            "device_id": self.device_id,
+            "scene_id": self.scene_id,
+            "event_time": self.event_time.isoformat() if self.event_time else None,
+            "first_frame_time": self.first_frame_time.isoformat() if self.first_frame_time else None,
+            "last_frame_time": self.last_frame_time.isoformat() if self.last_frame_time else None,
+            "duration_ms": self.duration_ms,
+            "alarm_level": self.alarm_level,
+            "confidence_score": self.confidence_score,
+            "alarm_status": self.alarm_status,
+            "handle_status": self.handle_status,
+            "snapshot_url": self.snapshot_url,
+            "video_url": self.video_url,
+            "edge_node_id": self.edge_node_id,
+            "handler": self.handler,
+            "handle_remark": self.handle_remark,
+            "handled_at": self.handled_at.isoformat() if self.handled_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 AlarmEventExt(Base):
+    """告警事件扩展表（算法结果详情）"""
+    __tablename__ = "alarm_event_ext"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    alarm_id = Column(String(64), nullable=False, index=True, comment="关联告警ID")
+    ext_type = Column(String(32), comment="扩展类型: EDGE/POST/MANUAL")
+    ext_data = Column(JSON, comment="扩展数据")
+    roi_config = Column(JSON, comment="ROI配置快照")
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+
+    def to_dict(self) -> dict:
+        return {
+            "id": self.id,
+            "alarm_id": self.alarm_id,
+            "ext_type": self.ext_type,
+            "ext_data": self.ext_data,
+            "roi_config": self.roi_config,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+        }
+
+
+class AlarmLlmAnalysis(Base):
+    """告警大模型分析表"""
+    __tablename__ = "alarm_llm_analysis"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    alarm_id = Column(String(64), nullable=False, index=True, comment="关联告警ID")
+    llm_model = Column(String(32), comment="模型名称")
+    analysis_type = Column(String(20), comment="分析类型: REVIEW/EXPLAIN/RISK")
+    summary = Column(Text, comment="分析摘要")
+    is_false_alarm = Column(Boolean, comment="是否误报")
+    risk_score = Column(Integer, comment="风险评分 0-100")
+    confidence_score = Column(Float, comment="分析置信度")
+    suggestion = Column(Text, comment="处置建议")
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+
+    def to_dict(self) -> dict:
+        return {
+            "id": self.id,
+            "alarm_id": self.alarm_id,
+            "llm_model": self.llm_model,
+            "analysis_type": self.analysis_type,
+            "summary": self.summary,
+            "is_false_alarm": self.is_false_alarm,
+            "risk_score": self.risk_score,
+            "confidence_score": self.confidence_score,
+            "suggestion": self.suggestion,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+        }
+
+
 # ==================== 数据库管理 ====================
 
 _engine = None