🚨(backend) run make api-update

src/backend/core/api/openapi.json

@@ -4065,8 +4065,8 @@
                     },
                     "subject": {
                         "type": "string",
-                        "minLength": 1,
-                        "description": "Subject of the message"
+                        "nullable": true,
+                        "description": "Subject of the message (optional; empty or null allowed)"
                     },
                     "draftBody": {
                         "type": "string",
@@ -4109,8 +4109,7 @@
                     }
                 },
                 "required": [
-                    "senderId",
-                    "subject"
+                    "senderId"
                 ]
             },
             "FlagEnum": {

src/frontend/src/features/api/gen/models/draft_message_request_request.ts

@@ -21,10 +21,10 @@ export interface DraftMessageRequestRequest {
   /** Mailbox ID to use as sender */
   senderId: string;
   /**
-   * Subject of the message
-   * @minLength 1
+   * Subject of the message (optional; empty or null allowed)
+   * @nullable
    */
-  subject: string;
+  subject?: string | null;
   /** Content of the draft message as arbitrary text (usually JSON) */
   draftBody?: string;
   /** List of recipient email addresses */