[BetterRed]

They're in the add-filter-rules.json file in the calibre configuration directory, you'll need to add a rule to create the file and get a 'template', which will look something like this

{
  "template": [
    {
      "query": "template", 
      "action": "ignore", 
      "match_type": "startswith"
    }
  ]
}

There's a button in Preferences->Miscellaneous to open the calibre configuration directory. And take a copy of the directory and close calibre before you edit any files in there.

BR