curl --request GET \
  --url http://localhost:8080/partners/stats

{
  "summary": {
    "total_referrers": 123,
    "total_referrals": 123,
    "paid_referrals": 123,
    "conversion_rate_percent": 123,
    "avg_earnings_per_referral_kopeks": 123
  },
  "payouts": {
    "all_time_kopeks": 123,
    "year_kopeks": 123,
    "month_kopeks": 123,
    "week_kopeks": 123,
    "today_kopeks": 123
  },
  "new_referrals": {
    "today": 123,
    "week": 123,
    "month": 123
  }
}