<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">
  <channel>
    <title>{{ site_name }} - {{ title }}</title>
    <description>{{ description|default(title ~ " requests from " ~ site_name) }}</description>
    <link>{{ main_link }}</link>
    {% for srp_request in requests %}
    <item>
      <title>{{ srp_request.pilot.name }}'s {{ srp_request.ship_type }} in {{ srp_request.system }} on {{ srp_request.kill_timestamp.strftime('%d %b %Y %H:%M') }}</title>
      <description>{{ srp_request.status }}</description>
      {% with request_url = url_for('requests.get_request_details', _external=True, request_id=srp_request.id) %}
      <link>{{ request_url }}</link>
      <guid isPermaLink="true">{{ request_url }}</guid>
      {% endwith %}
      <pubDate>{{ srp_request.timestamp.strftime('%a, %d %b %Y %H:%M:%S +0000') }}</pubDate>
      <category>{{ srp_request.division.name }}</category>
    </item>
    {% endfor %}
  </channel>
</rss>

<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">
  <channel>
    <title>{{ site_name }} - {{ title }}</title>
    <description>{{ description|default(title ~ " requests from " ~ site_name) }}</description>
    <link>{{ main_link }}</link>
    {% for srp_request in requests %}
    <item>
      <title>{{ srp_request.pilot.name }}'s {{ srp_request.ship_type }} in {{ srp_request.system }} on {{ srp_request.kill_timestamp.strftime('%d %b %Y %H:%M') }}</title>
      <description>{{ srp_request.status }}</description>
      <link>{{ url_for('requests.get_request_details', _external=True, request_id=srp_request.id) }}</link>
      {% if srp_request.actions|length == 0 %}
      <guid isPermaLink="false">{{ srp_request.id }}</guid>
      {% else %}
      <guid isPermaLink="false">{{ srp_request.id }}-{{ srp_request.actions|first|attr('id') }}</guid>
      {% endif %}
      <pubDate>{{ srp_request.timestamp.strftime('%a, %d %b %Y %H:%M:%S +0000') }}</pubDate>
      <category>{{ srp_request.division.name }}</category>
    </item>
    {% endfor %}
  </channel>
</rss>

Clean up RSS template so items get updated
Clean up RSS template so items get updated

The guid element is now the request id concatenated with the latest action id (which will be updated when a new action get added).