Knack is a Rapid Application Tool used for collecting and storing data, with some neat functionality to create workflow based on filters/views of the data. Having integration to N8N would at least soften some of the shortcomings of the API as you can not share data in between projects, which many people utilize the same data set or require certain segments to be up to date due to each Knack application performing a specific function.
I would be overjoyed if this could be put into place to allow to perform crud operation on one or all records, or even pull information from custom views.
As the integration received only 3 votes in the last 2 years is it currently sadly not a priority. If you are interested in it, you would probably have to create it yourself or find somebody to do it for you. Sorry
We use Knack extensively and have had a Knack node developed as we have quite a few integrations with other technologies. We will be making this available to the community.