Changing watch date to "unknown" in bulk

Just saw that you can now add shows and movies with an unknown watch date. What’s the easiest way to bulk change a lot of older plays to this (around 8000)? In the past I put most of my unknown plays on a view specific dates, so finding them in the history shouldn’t be a problem.
Through some digging around in other forum posts and a bit of trial and error, I found out, that you can export a list of plays through the history with the “CSV-Export”-Button and import them back in with the date changed to „1970-01-01T00:00:00Z“ to get trakt recognize it as „unknown date“. But the import only works when you don’t already have plays on the episodes/movies and I don’t want to manually delete all those existing ones.

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If your prior history is on specific days, you can use the delete data tool in your advanced settings to delete data entered on a specific date/time period. Other than that, there isn’t a way to bulk delete history items. We always recommend having a backup before deleting data, just in case, but it seems like you’ve already got that figured out.