How do you implement that? I have a whitelisting transparent proxy for my kids (contrary to the popular meme around here that all kids are NSA grade hackers determined to defy your every attempt to protect them, it's uncontroversial in my house and works very well). I use squid for that and have a shonky web UI I made to access the logs and update the whitelist acl. I'd like to make it more capable (stuff like temporary unblock like you mention). AFAICT the only way to do such things is writing a squid "helper" that runs as a separate process (/processes). Is that what you're doing?
I use adblock on openwrt with a basic script to write to and revert the whitelist, and to restart dnsmasq. I use qutebrowser and made whitelisting a hints shortcut.
There's almost certainly a better system, but this works for me.
