Notes became "Untagged", can they be set back through History

My DT database has about 11k notes. At some point a few months ago, I did something that somehow “untagged” my notes. I’ve tried searching for solutions and haven’t been able to find a resolution. Can the action that I triggered but “undone” using the History function?

I know when the unfortunate incident occurred. I’ve created additional notes since then, but I imagine that I could export those notes, reset the database to the state before the untagging, then reimport the newer notes back into the database. Any suggestions would be appreciated.

Sorry but no, there is no History function. There is a so-naked global smart group that just lists the documents in the open databases.

Were you using group tags, i.e., disabling File > Database Properties > Exclude Groups From Tagging?