minor additions

backend.yml

@@ -175,7 +175,8 @@ components:
       - id
       - name
       - element_count
-      - tracklist
+      - itemlist
+      - type
       type: object
       properties:
         id:
@@ -185,7 +186,9 @@ components:
           type: string
         element_count:
           type: integer
-        tracklist:
+        type:
+          type: string
+        itemlist:
           type: array
           items:
             $ref: '#/components/schemas/Track'
@@ -193,10 +196,6 @@ components:
       required:
       - id
       - title
-      - artist
-      - album
-      - spotify_id
-      - cover_url
       type: object
       properties:
         id: