päivystänyt
Päivystänyt is the past active participle of the Finnish verb "päivystää." The verb "päivystää" means to be on duty, to be on call, or to stand by, often in a medical or emergency services context. Therefore, "päivystänyt" describes a person or entity that has performed this action. It translates most directly to "having been on duty" or "who was on call."
The word is used in Finnish to indicate that someone has completed the act of being on