You need to reconfigure the database.
https://github.com/RMerl/asuswrt-merlin/wiki/Enhanced-Traffic-monitoring
I did. I manually moved the old files to a different directory on my usb drive and selected 'Create or reset IPTraffic data files' for both global and per IP Traffic monitoring.
The only one I don't get values for is Realtime -> Global -> Monthly. I get values for all other sections.
Edit: I tried switching to RAM for the storage location and same result. Monthly is blank.
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