Events with a URL were saved with source "external", so Contao linked lists straight to the external site and redirected the detail page. The URL is now kept in the url field and only shown as a button on the detail page. - frontend form saves source "default" for every event - backend: source option "external" removed, url field relabelled "Externer Link", obsolete target field dropped from the palette - migration switches existing source="external" events to "default" Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>