--- a/app/views/layouts/mailer.html.erb
+++ b/app/views/layouts/mailer.html.erb
@@ -1,12 +1,68 @@
+<%
+  # Geändert von Jens Schulz (AGPLv3 Abschnitt 5a): Firmen-Layout seit 29.04.2026, zuletzt 02.11.2026 (Original-Zeile zu DocuSeal im Fuß).
+  # Logo und Visitenkarte als eingebettete Bilder (cid), damit sie auch ohne "externe Inhalte laden" erscheinen.
+  bild = lambda do |name, datei, extern|
+    attachments.inline[name] = File.binread(Rails.public_path.join('branding', datei)) unless attachments[name]
+    attachments[name].url
+  rescue StandardError
+    extern
+  end
+  logo_src = bild.call('logo.png', 'logo_mail.png', 'https://sign.elm-energy.de/branding/logo.png')
+  vk_src = bild.call('visitenkarte.jpg', 'visitenkarte_mail.jpg', 'https://sign.elm-energy.de/branding/visitenkarte.png')
+%>
 <!DOCTYPE html>
 <html>
   <head>
     <title></title>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
-    <style></style>
+    <style>
+      body { margin: 0; padding: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background-color: #f4f6f9; }
+      a { color: #0f63c6; text-decoration: none; }
+      .em-wrap { width: 100%; background-color: #f4f6f9; }
+      .em-card { max-width: 600px; margin: 0 auto; background: #ffffff; border-radius: 16px; box-shadow: 0 4px 24px rgba(0,0,0,0.08); overflow: hidden; }
+      .em-logo-cell { padding: 30px 35px 22px 35px; border-bottom: 1px solid #eef1f5; text-align: center; }
+      .em-logo-cell img { width: 90px; height: 90px; }
+      .em-firma { margin: 12px 0 0 0; color: #1a1a2e; font-size: 18px; font-weight: 700; line-height: 1.3; }
+      .em-firma-zusatz { margin: 2px 0 0 0; color: #4b5563; font-size: 14px; line-height: 1.4; }
+      .em-content { padding: 35px 35px 40px 35px; color: #1a1a2e; font-size: 15px; line-height: 1.7; }
+      .em-content p { margin: 0 0 14px 0; }
+      .em-content a { color: #0f63c6; }
+      .em-vk-cell { padding: 0 35px 35px 35px; border-top: 1px solid #eef1f5; padding-top: 25px; text-align: center; }
+      .em-vk-cell img { max-width: 380px; width: 100%; border-radius: 8px; }
+      .em-footer { color: #9ca3af; font-size: 12px; padding: 20px 20px 40px 20px; text-align: center; }
+    </style>
   </head>
   <body dir="<%= TextUtils.rtl?(yield) ? 'rtl' : 'auto' %>">
-    <%= yield %>
-    <%= render partial: 'shared/mailer_attribution' %>
+    <table class="em-wrap" width="100%" cellpadding="0" cellspacing="0">
+      <tr>
+        <td align="center" style="padding: 40px 20px 20px 20px;">
+          <table class="em-card" width="100%" cellpadding="0" cellspacing="0">
+            <tr>
+              <td class="em-logo-cell">
+                <img src="<%= logo_src %>" width="90" height="90" alt="Logo Jens Schulz"/>
+                <p class="em-firma">Jens Schulz</p>
+                <p class="em-firma-zusatz">Fachbetrieb f&uuml;r Informations- und Elektrotechnik</p>
+              </td>
+            </tr>
+            <tr>
+              <td class="em-content">
+                <%= yield %>
+              </td>
+            </tr>
+            <tr>
+              <td class="em-vk-cell">
+                <img src="<%= vk_src %>" width="380" alt="Visitenkarte Jens Schulz"/>
+              </td>
+            </tr>
+          </table>
+          <div class="em-footer">
+            Jens Schulz &middot; Fachbetrieb f&uuml;r Informations- und Elektrotechnik<br>
+            An der Plantage 12 &middot; 38170 Sch&ouml;ppenstedt &middot;
+            <a href="https://www.elm-energy.de">elm-energy.de</a><br>
+            <%= t('sent_using_product_name_open_source_software_html', product_url: "#{Docuseal::PRODUCT_EMAIL_URL}/open", product_name: Docuseal.product_name) %>
+          </div>
+        </td>
+      </tr>
+    </table>
   </body>
 </html>
--- a/lib/puma/plugin/redis_server.rb
+++ b/lib/puma/plugin/redis_server.rb
@@ -53,8 +53,16 @@
 
       Dir.chdir(ENV.fetch('WORKDIR', nil)) unless ENV['WORKDIR'].to_s.empty?
 
-      exec('redis-server', '--requirepass', Digest::SHA1.hexdigest("redis#{ENV.fetch('SECRET_KEY_BASE', '')}"),
-           '--bind', '127.0.0.1', '--port', '16379',
+      # Patched by elm-energy (2026-10-14, an 3.3.5 angepasst 2026-11-09): Original-Argumente von DocuSeal
+      # (--bind/--port, Port aus LOCAL_REDIS_URL) plus abgeschaltete RDB-/AOF-Persistenz.
+      # Sidekiq queue is transient -> no data loss.
+      redis_port = (URI.parse(ENV['LOCAL_REDIS_URL'].to_s).port rescue nil) || 16379
+      exec('redis-server',
+           '--requirepass', Digest::SHA1.hexdigest("redis#{ENV.fetch('SECRET_KEY_BASE', '')}"),
+           '--bind', '127.0.0.1', '--port', redis_port.to_s,
+           '--save', '',
+           '--stop-writes-on-bgsave-error', 'no',
+           '--appendonly', 'no',
            '--loglevel', 'warning')
     end
   end
--- a/app/views/shared/_attribution.html.erb
+++ b/app/views/shared/_attribution.html.erb
@@ -1 +1,9 @@
+<%# Geändert von Jens Schulz am 02.11.2026 (AGPLv3 Abschnitt 5a): eigene Fußzeile und Quelltext-Link ergänzt, Original-Angabe unverändert. %>
 <%= render 'shared/powered_by', with_counter: local_assigns[:with_counter], link_path: local_assigns[:link_path] %>
+<div class="text-center text-xs text-base-content/40 mt-2 mb-4">
+  <a href="https://www.elm-energy.de" class="hover:underline" target="_blank" rel="noopener">elm-energy.de</a>
+  &nbsp;·&nbsp;
+  Jens Schulz — Fachbetrieb für Informations- und Elektrotechnik
+  &nbsp;·&nbsp;
+  <a href="/branding/quelltext/index.html" class="hover:underline" target="_blank" rel="noopener">Quelltext dieser Fassung</a>
+</div>
--- a/app/views/layouts/form.html.erb
+++ b/app/views/layouts/form.html.erb
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <html data-theme="docuseal" lang="<%= I18n.locale %>">
   <head>
+    <%# Geändert von Jens Schulz am 29.04.2026, an DocuSeal 3.3.5 angepasst am 09.11.2026 (AGPLv3 Abschnitt 5a): Weiterleitung auf danke.html, wenn ein Formular schon abgeschlossen ist. %>
     <%= render 'layouts/head_tags' %>
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <%= csrf_meta_tags %>
@@ -11,6 +12,52 @@
       <%= javascript_pack_tag 'form', defer: true %>
     <% end %>
     <%= stylesheet_pack_tag 'form', media: 'all', data: { turbo_track: 'dynamic' } %>
+    <script>
+      // elm-energy: zwei Hijacks — fetch + alert — wenn Submission bereits abgeschlossen,
+      // redirecten wir auf die Danke-Seite, statt das DocuSeal-Pop-up zu zeigen.
+      (function() {
+        var DANKE_URL = 'https://sign.elm-energy.de/branding/danke.html?from=already_completed';
+        var COMPLETED_RE = /abgeschlossen|completed|completata|completado/i;
+
+        // 1) fetch-Hijack: 422 mit "completed"-Error -> Redirect (greift vor Vue-alert)
+        var origFetch = window.fetch;
+        window.fetch = function() {
+          var args = arguments;
+          return origFetch.apply(this, args).then(function(resp) {
+            try {
+              var url = String((args && args[0]) || '');
+              if (resp && resp.status === 422 && url.indexOf('/s/') === -1
+                  && (url.indexOf('/submit_form') !== -1 || url.indexOf('submitter') !== -1 || resp.url.indexOf('/s/') !== -1)) {
+                resp.clone().json().then(function(data) {
+                  var err = String((data && data.error) || '');
+                  if (COMPLETED_RE.test(err)) {
+                    window.location.href = DANKE_URL;
+                  }
+                }).catch(function(){});
+              } else if (resp && resp.status === 422) {
+                resp.clone().json().then(function(data) {
+                  var err = String((data && data.error) || '');
+                  if (COMPLETED_RE.test(err)) {
+                    window.location.href = DANKE_URL;
+                  }
+                }).catch(function(){});
+              }
+            } catch(e) {}
+            return resp;
+          });
+        };
+
+        // 2) alert-Hijack als Fallback
+        var origAlert = window.alert;
+        window.alert = function(msg) {
+          if (COMPLETED_RE.test(String(msg || ''))) {
+            window.location.href = DANKE_URL;
+            return;
+          }
+          return origAlert.call(window, msg);
+        };
+      })();
+    </script>
   </head>
   <body>
     <main>