One to one and one to many

model Event {
  active_meeting_id  String?
  active_meeting     Meeting @relation(name: "active_meeting", fields: [active_meeting_id], references: [id])

  old_meetings      Meeting[]     @relation(name: "old_meetings")
}

model Meeting {
  event_id          String?
  event             Event?         @relation(name: "active_meeting")
  old_event         Event?         @relation(name: "old_meetings", fields: [event_id], references: [id])
}