add(:user_id, references(:users, type: :uuid, on_delete: :delete_all))
add(:activity_id, references(:activities, type: :uuid, on_delete: :delete_all))
timestamps()
end
add(:user_id, references(:users, type: :uuid, on_delete: :delete_all))
add(:activity_id, references(:activities, type: :uuid, on_delete: :delete_all))
timestamps()
end