修复 ROI 区域内人员离开十几分钟未触发告警的问题。

1. 仍在 confirm_sec 滑动窗口内（未完成确认）
2. threshold_sec 阈值设置过长（需检查数据库实际配置值）
3. 新算法未被正确调用

db/models.py

@@ -90,9 +90,9 @@ class ROI(Base):
     direction: Mapped[Optional[str]] = mapped_column(String(32))
     stay_time: Mapped[Optional[int]] = mapped_column(Integer)
     enabled: Mapped[bool] = mapped_column(Boolean, default=True)
-    threshold_sec: Mapped[int] = mapped_column(Integer, default=360)
-    confirm_sec: Mapped[int] = mapped_column(Integer, default=30)
-    return_sec: Mapped[int] = mapped_column(Integer, default=5)
+    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)
     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)