Counts of the funnel events per time bucket and/or per quiz, quiz version, paywall,
paywall version and payment system, read straight from the event log.

Each row has, for every event, the number of events (<name>) and the number of unique users
(<name>_users):
paywall_view (CompleteRegistration / Quiz finished, the same definition as the cabinet
Overview), initiate_checkout (InitiateCheckout), add_payment_info (AddPaymentInfo) and
subscribe (Subscribe).

from/to accept a date (whole day in the project timezone) or a date-time with an exact time
(2026-10-01T16:00:00Z). Defaults to the last 24 hours; the range is limited to 93 days.
hour / day buckets are in UTC. payment_system is read from the payment_system property of
the event and is empty when the event does not carry it.
Without group_by a single total row is returned.