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If you don't care about the sums being inserted into that table, then you could just use a combination of find(1) and sha1sum(1) on the command line. But if you're primarily wanting to check for duplicates, then there's software like e.g. czkawka, which works on at least Linux, Win and macOS.
But if Nextcloud isn't using the data for anything, why do you think it will help to add the values? At what point does Nextcloud use that data to compare files, if it doesn't even populate the values in the first place? It just seems like there's an assumption that it's necessary for this value to be populated in every instance, instead of trusting that Nextcloud is working correctly, especially if you aren't actually experiencing any issues. I would recommend opening an issue on Github if you haven't already, and possibly get a better explanation from the developers: https://github.com/nextcloud/server/issues