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Device.getOldConfigValue("key");

//Returns an Object of the following form: (Returns Null if no Config Value with matching Name was found.)
{
   "name":"testValue", //Name of the ConfigValue
   "value":"HELLO USER!", //Value set.
   "setValue":"2021-08-30T11:17:54.17557+02:00", //Timestamp when the Config Value was updated.
   "updatedAt":"2021-08-30T11:17:54.17557+02:00" //can be ignored. Timestamp when the ConfigValue was updated in the DB. 
}