text: uint64[] requested_ids           # The IDs of the tracks you are interested in getting the trajectories of. An empty array means all available tracks.
  duration max_age                 # The maximum age of a trajectory you want to get. A duration of 0 means "since the beginning of times."
  ---
  PersonTrajectory[] trajectories  # The trajectories of the tracks that have been asked for in requested_ids, in the same order.
  