As far as log files are concerned, I'm not sure whether this would be technically feasible.
pihole-FTL/dnsmasq logs requests as they are received, i.e. before it would decide whether a request should be blocked or forwarded.
This results in log lines stating the domain and client:
query[A] discourse.pi-hole.net from 192.168.1.100
query[A] flurry.com from 192.168.1.100
To get rid of lines already written to the logs while new requests keep arriving would be quite messy.
Changing the code to delay logging until after the decision has been made could work, but likely would mean a change to upstream dnsmasq, which Pi-hole tries to keep to a minimum (that said, the Pi-hole team has provided numerous patches for upstream dnsmasq in the past, but it would depend on dnsmasq maintainers whether a patch would be accepted).
As far as the database is concerned, it should be possible to implement, as the database code is Pi-hole's exclusively, but I cannot comment on involved efforts, of course.
Let's see what the development team thinks about it.