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So despite a UPS and other measures I've taken to ensure my OPNsense box never loses power abruptly I still end up unplugging a wrong cord or a battery fails or whatever and the Unifi Controller mongodb seems to instantly corrupt. Maybe there is a way of fixing this but restoring from an automated backup has been the only method I have attempted. Anyway, here is the script I wrote that will fix the corrupted database quick.

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#!/usr/local/bin/bash
service unifi stop
pkg remove -y unifi6
mv /usr/local/share/java/unifi /usr/local/share/java/unifi.bad
pkg install -y unifi6 os-unifi-maxit
cp -pRv /usr/local/share/java/unifi.bad/data/backup /usr/local/share/java/unifi/data/backup
service unifi start
rm -rf /usr/local/share/java/unifi.bad
ipaddr=$(ifconfig em1 | grep 'inet' | awk '$1 == "inet" { print $2 }')         
echo "Now to go https://$ipaddr:8443 and restore your backup."
read -p "Press enter to continue" continue
service unifi start


I place this in a file called /root/unifi-fix.sh then make it executable "chmod +x unifi-fix.sh" and then execute it ./unifi-fix.sh

I'm unable to get OPNsense to check for updates because DNS is failing.

/etc/resolv.conf has an incorrect nameserver (10.13.13.1) that I cannot ping and also says it's generated by resolvconf

I can modify my DNS settings through System->Settings->General but when I reboot it reverts back to the incorrect configuration.

Also running, Unifi controller through 3rd party repo, wondering if this isn't the cause?