Show webmention checks in admin

slices/admin/templates/webmentions/index.html.slim

@@ -6,6 +6,7 @@ div class="mb-12 prose dark:prose-invert max-w-prose mx-auto text-gray-800 dark:
       td ID
       td Type
       td Author
+      td Checked at
       td Content
       td
       td
@@ -19,6 +20,8 @@ div class="mb-12 prose dark:prose-invert max-w-prose mx-auto text-gray-800 dark:
           = webmention.type
         td
           = webmention.author_name
+        td
+          = "#{webmention.last_checked_at.strftime("%c")} (#{webmention.retrieval_attempts})"
         td
           div class="w-full"
           / span class="px-2"