@type t() :: %EveESI.Model.GetSovereigntyCampaigns200Ok{
  attackers_score: float() | nil,
  campaign_id: integer(),
  constellation_id: integer(),
  defender_id: integer() | nil,
  defender_score: float() | nil,
  event_type: String.t(),
  participants: [EveESI.Model.GetSovereigntyCampaignsParticipant.t()] | nil,
  solar_system_id: integer(),
  start_time: DateTime.t(),
  structure_id: integer()
}