Different category per site for embedded comments

You can add this data- attribute to the <div class="talkyard-comments">:

<div class="talkyard-comments" data-category="extid:per_domain_category" data-discussion-id="..."></div>

That'll place the comments in the category with external id per_domain_category. This is an id of your choosing — and you specify it in the Edit Category dialog, at the bottom (looks like this by default: "External ID (optional): None").

Comments from the site "mydomain.de" should create a category "mydomain.de" with the first comment which is created and put all comments from this site into this category

Hmm this probably won't be supported the nearest time.

Currently, you'll need to create categories manually, and add your own external ids. (I think you can just use the domain name.) There's an API for upserting categories, so theoretically, an external software thing could do this. Although I suspect you don't have that many domains? (So not worth the time to create such a software thing?)

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B.t.w. it's a good question :- )   this really should be in the docs. I'm adding sub categories to Ty currently, so that there can be a "How To" docs sub category, with things like this.

visiting the overview of the Talkyard server itself is a bit a mess without the ability to filter easily by the site the comment comes from

Once sub categories is in place, you could have a Comments base category, with a sub category per blog domain.
And there could be other base categories, if your whole "network of sites" share some common things .... categories? to talk about.

B.t.w. when you create a blog comments site via Ty .io, the blog comments list is by default visible to mods & admins only.