How to clear the keyword database?

How to clear the keyword database?

Hello,

After making a mess of my Keywords after ingesting my photo's.
I'm now stuck with thousends of keywords that make no sense on the photo's.

As a last effort to start over, i have deleted all my keywords via lightroom and saved all the metadata to xmp files.

After starting peakto again. I started a new deep sync. And hoping that everithing become clean again.

Now is my question how can i delete the key words in the peakto database? without a roundtrip through lightroom?