diff --git a/source/repositories/calendar.ts b/source/repositories/calendar.ts
index 68f0d74..341dc47 100644
--- a/source/repositories/calendar.ts
+++ b/source/repositories/calendar.ts
@@ -366,6 +366,7 @@ namespace _zeitbild.repository.calendar
 	
 	
 	/**
+	 * @todo remove events from resource?
 	 */
 	export async function delete_(
 		calendar_id : _zeitbild.type_calendar_id
@@ -377,7 +378,7 @@ namespace _zeitbild.repository.calendar
 		{
 			const hits : Array<Record<string, any>> = await access_attributed_chest.search(
 				{
-					"expression": "(calendar_id = {{calendar_id}})",
+					"expression": "(calendar_id = $calendar_id)",
 					"arguments": {
 						"calendar_id": calendar_id,
 					}