Making long running operations asynchronous

app/templates/admin/_job_progress.html

@@ -0,0 +1,7 @@
+<div id="{{ container_id }}"
+     hx-get="{{ poll_url }}"
+     hx-trigger="load delay:1s"
+     hx-swap="outerHTML"
+     class="{{ extra_class or '' }}">
+  <p class="muted">⏳ {{ job.message }}</p>
+</div>