curl --request GET \
  --url http://localhost:8080/partners/referrers/{user_id}/stats/compare

{
  "current_period": {
    "days": 123,
    "start": "<string>",
    "end": "<string>",
    "referrals_count": 123,
    "earnings_kopeks": 123
  },
  "previous_period": {
    "days": 123,
    "start": "<string>",
    "end": "<string>",
    "referrals_count": 123,
    "earnings_kopeks": 123
  },
  "change": {
    "referrals": {
      "absolute": 123,
      "percent": 123,
      "trend": "<string>"
    },
    "earnings": {
      "absolute": 123,
      "percent": 123,
      "trend": "<string>"
    }
  },
  "user_id": 123
}