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

{
  "user_id": 123,
  "summary": {
    "total_referrals": 123,
    "paid_referrals": 123,
    "active_referrals": 123,
    "conversion_to_paid_percent": 123,
    "conversion_to_active_percent": 123,
    "avg_earnings_per_referral_kopeks": 123
  },
  "earnings": {
    "all_time_kopeks": 123,
    "year_kopeks": 123,
    "month_kopeks": 123,
    "week_kopeks": 123,
    "today_kopeks": 123
  },
  "referrals_count": {
    "all_time": 123,
    "year": 123,
    "month": 123,
    "week": 123,
    "today": 123
  }
}