fix:修复因数据库缺少 working_hours 列导致 ROI 配置失败的问题。

- 手动执行 SQL：ALTER TABLE rois ADD COLUMN working_hours TEXT
- 确保现有 SQLite 数据库（security_monitor.db）结构与模型定义一致
- 避免因字段缺失引发 API 或算法读取异常

db/models.py

@@ -93,6 +93,7 @@ class ROI(Base):
     threshold_sec: Mapped[int] = mapped_column(Integer, default=300)
     confirm_sec: Mapped[int] = mapped_column(Integer, default=10)
     return_sec: Mapped[int] = mapped_column(Integer, default=30)
+    working_hours: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
     pending_sync: Mapped[bool] = mapped_column(Boolean, default=False)
     sync_version: Mapped[int] = mapped_column(Integer, default=0)
     created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)