Add last_updated field to be able to track outdated information / lost items

static/form.html

@@ -43,6 +43,9 @@
 
       <label for="hidden">Hide by default</label>
       <input type="checkbox" id="hidden">
+
+      <label for="last_updated">Last updated</label>
+      <input id="last_updated" type="text" disabled>
     </form>
     
     <button id="delete" class="btn red" autocomplete="off">Delete</button>