CalDavSync already reads **Bis:** out of the body on push (and writes it on pull), but the in-app template used when the user clicks a calendar day to create an appointment didn't offer the field — forcing the user to type the marker from scratch for multi-day or ranged events. Drop it in next to **Zeit:** so the round-trip is symmetric. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>