实现区域阈值告警任务

internal/infra/models/alarm.go

@@ -34,6 +34,17 @@ const (
 	// (可在此处预留或添加)
 )
 
+type Operator string
+
+const (
+	OperatorLessThan             Operator = "<"
+	OperatorLessThanOrEqualTo    Operator = "<="
+	OperatorGreaterThan          Operator = ">"
+	OperatorGreaterThanOrEqualTo Operator = ">="
+	OperatorEqualTo              Operator = "="
+	OperatorNotEqualTo           Operator = "!="
+)
+
 // ActiveAlarm 活跃告警
 // 活跃告警会被更新（如忽略状态），因此保留 gorm.Model 以包含所有标准字段。
 type ActiveAlarm struct {