Restrict admin to system management

frontend/src/types.ts

@@ -16,29 +16,6 @@ export type AdminUser = AuthUser & {
   updated_at: string;
 };
 
-export type AdminSession = {
-  id: string;
-  ticket_id: string;
-  user_id: string;
-  owner_username: string;
-  owner_display_name: string;
-  ticket_number: string;
-  organization_id: string | null;
-  organization_name: string | null;
-  customer_name: string;
-  activity: string;
-  work_type: WorkType;
-  started_at: string;
-  ended_at: string;
-  duration_seconds: number;
-  rounded_minutes: number;
-  billing_status: BillingStatus;
-  created_at: string;
-  recurring_billing_id: string | null;
-  recurring_billing_slot_id: string | null;
-  recurring_occurrence_date: string | null;
-};
-
 export type Organization = {
   id: string;
   zammad_id: string;