curl --request POST \
  --url https://api.production.hyperoru.com/api/signals/definitions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "signal_name": "<string>",
  "trigger_condition": "<unknown>",
  "description": "<string>",
  "enabled": true,
  "exchange": "<string>"
}
'

{
  "exchange": "<string>",
  "id": 123,
  "signal_name": "<string>",
  "trigger_condition": "<unknown>",
  "created_at": "<string>",
  "description": "<string>",
  "enabled": true,
  "updated_at": "<string>"
}