How to reslove When I save webpixel id failed

I do not Know , what can I do to get the webPixel Id.
If lose the webPxiel Id, I cannot query , delete , update
and I use webPixelCreate get an error ‘pixel is create, please use update’ !
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I get a plan to reslove this problem is to uninstall app and then install app again,
Now I can use webPixelCeate to get a new webPxiel Id
So I realy want to know what can I use by graphql to get webPxiel Id to reslove the problem

blew is my code image