diff --git a/docs/ouranos.html b/docs/ouranos.html
index 5ba34b7..d2028bf 100644
--- a/docs/ouranos.html
+++ b/docs/ouranos.html
@@ -58,7 +58,7 @@
                 <div class="col-lg-8">
                     <h1 class="display-4 fw-bold"><i class="bi bi-diagram-3-fill"></i> Ouranos Lab</h1>
                     <p class="lead">Red Panda Approved™ Infrastructure as Code</p>
-                    <p class="mb-0">10 Incus containers named after moons of Uranus, provisioned with Terraform and configured with Ansible. Accessible at <a href="https://ouranos.helu.ca" class="text-white fw-bold">ouranos.helu.ca</a></p>
+                    <p class="mb-0">11 Incus containers named after moons of Uranus, provisioned with Terraform and configured with Ansible. Accessible at <a href="https://ouranos.helu.ca" class="text-white fw-bold">ouranos.helu.ca</a></p>
                 </div>
                 <div class="col-lg-4 text-center mt-3 mt-lg-0">
                     <div class="badge bg-success fs-6 p-3">
@@ -87,7 +87,7 @@
                     <div class="card-body">
                         <p class="card-text">Provisions the Uranian host containers with:</p>
                         <ul class="mb-0">
-                            <li>10 specialised Incus containers (LXC)</li>
+                            <li>11 specialised Incus containers (LXC)</li>
                             <li>DNS-resolved networking (<code>.incus</code> domain)</li>
                             <li>Security policies and nested Docker support</li>
                             <li>Port proxy devices and resource dependencies</li>
@@ -106,7 +106,7 @@
                         <p class="card-text">Deploys and configures all services:</p>
                         <ul class="mb-0">
                             <li>Docker engine on nested-capable hosts</li>
-                            <li>Databases: PostgreSQL (Portia), Neo4j (Ariel)</li>
+                            <li>Databases: PostgreSQL (Portia), Neo4j (Ariel — shared; Umbriel — dedicated Mnemosyne instance)</li>
                             <li>Observability: Prometheus, Loki, Grafana (Prospero)</li>
                             <li>Application runtimes and LLM proxies</li>
                             <li>HAProxy TLS termination and Casdoor SSO (Titania)</li>
@@ -198,6 +198,12 @@
                                 <td>HAProxy, Casdoor SSO, certbot</td>
                                 <td class="text-center"><i class="bi bi-check-circle-fill text-success"></i></td>
                             </tr>
+                            <tr>
+                                <td><strong>umbriel</strong></td>
+                                <td><span class="badge bg-warning text-dark">graph_database</span></td>
+                                <td>Neo4j 5.26.0 (dedicated Mnemosyne instance)</td>
+                                <td class="text-center"><i class="bi bi-check-circle-fill text-success"></i></td>
+                            </tr>
                         </tbody>
                     </table>
                 </div>
@@ -250,8 +256,26 @@
                         <p class="text-muted fst-italic small">Air spirit — ethereal, interconnected nature mirroring graph relationships.</p>
                         <ul class="mb-0">
                             <li>Neo4j 5.26.0 (Docker)</li>
-                            <li>HTTP API: port 25554</li>
-                            <li>Bolt: port 7687</li>
+                            <li>HTTP Browser: port 25554</li>
+                            <li>Bolt: port 7687 (reached as <code>ariel.incus:7687</code>)</li>
+                            <li>Shared graph work — Neo4j MCP, exploration</li>
+                        </ul>
+                    </div>
+                </div>
+            </div>
+
+            <div class="col-lg-6">
+                <div class="card h-100 border-warning">
+                    <div class="card-header bg-warning text-dark">
+                        <h5 class="mb-0"><i class="bi bi-diagram-2 me-2"></i>umbriel — Graph Database (Mnemosyne)</h5>
+                    </div>
+                    <div class="card-body">
+                        <p class="text-muted fst-italic small">Dusky melancholy sprite from Pope's <em>Rape of the Lock</em> — keeper of the Cave of Spleen, naturally paired with Mnemosyne the Titan of memory.</p>
+                        <ul class="mb-0">
+                            <li>Neo4j 5.26.0 (Docker)</li>
+                            <li>HTTP Browser: port 25555</li>
+                            <li>Bolt: port 7687 (reached as <code>umbriel.incus:7687</code>)</li>
+                            <li>Dedicated to <strong>Mnemosyne</strong> — owns <code>Library</code>/<code>Collection</code>/<code>Item</code>/<code>Chunk</code>/<code>Concept</code> labels, vector index, and schema migrations</li>
                         </ul>
                     </div>
                 </div>
@@ -563,7 +587,7 @@ ansible-vault encrypt new_secrets.yml</code></pre>
                                     <tr><td><code>pplg/deploy.yml</code></td><td>Prospero</td><td>Full observability stack + internal HAProxy + OAuth2-Proxy</td></tr>
                                     <tr><td><code>postgresql/deploy.yml</code></td><td>Portia</td><td>PostgreSQL with all databases</td></tr>
                                     <tr><td><code>postgresql_ssl/deploy.yml</code></td><td>Titania</td><td>Dedicated PostgreSQL for Casdoor</td></tr>
-                                    <tr><td><code>neo4j/deploy.yml</code></td><td>Ariel</td><td>Neo4j graph database</td></tr>
+                                    <tr><td><code>neo4j/deploy.yml</code></td><td>Ariel, Umbriel</td><td>Neo4j graph database (Umbriel is the dedicated Mnemosyne instance)</td></tr>
                                     <tr><td><code>searxng/deploy.yml</code></td><td>Oberon</td><td>SearXNG privacy search</td></tr>
                                     <tr><td><code>haproxy/deploy.yml</code></td><td>Titania</td><td>HAProxy TLS termination and routing</td></tr>
                                     <tr><td><code>casdoor/deploy.yml</code></td><td>Titania</td><td>Casdoor SSO</td></tr>
@@ -713,6 +737,7 @@ flowchart LR
                             <tr><td>All LLM apps</td><td>Arke (Sycorax)</td><td><code>http://sycorax.incus:25540</code></td></tr>
                             <tr><td>Open WebUI, Arke, Gitea, Nextcloud, LobeChat</td><td>PostgreSQL (Portia)</td><td><code>portia.incus:5432</code></td></tr>
                             <tr><td>Neo4j MCP</td><td>Neo4j (Ariel)</td><td><code>ariel.incus:7687</code> (Bolt)</td></tr>
+                            <tr><td>Mnemosyne</td><td>Neo4j (Umbriel)</td><td><code>umbriel.incus:7687</code> (Bolt) — dedicated tenant</td></tr>
                             <tr><td>MCP Switchboard</td><td>Docker API (Miranda)</td><td><code>tcp://miranda.incus:2375</code></td></tr>
                             <tr><td>MCP Switchboard, Kairos, Spelunker</td><td>RabbitMQ (Oberon)</td><td><code>oberon.incus:5672</code></td></tr>
                             <tr><td>All apps (SMTP)</td><td>smtp4dev (Oberon)</td><td><code>oberon.incus:22025</code></td></tr>