diff --git a/ansible/inventory/host_vars/portia.incus.yml b/ansible/inventory/host_vars/portia.incus.yml
index f763022..b4d8399 100644
--- a/ansible/inventory/host_vars/portia.incus.yml
+++ b/ansible/inventory/host_vars/portia.incus.yml
@@ -50,6 +50,9 @@ periplus_db_password: "{{ vault_periplus_db_password }}"
 daedalus_db_name: daedalus
 daedalus_db_user: daedalus
 daedalus_db_password: "{{ vault_daedalus_db_password }}"
+mnemosyne_db_name: mnemosyne
+mnemosyne_db_user: mnemosyne
+mnemosyne_db_password: "{{ vault_mnemosyne_db_password }}"
 
 # PostgreSQL admin password
 postgres_password: "{{ vault_postgres_password }}"
diff --git a/ansible/postgresql/deploy.yml b/ansible/postgresql/deploy.yml
index 1e9bfcb..c3b41ac 100644
--- a/ansible/postgresql/deploy.yml
+++ b/ansible/postgresql/deploy.yml
@@ -203,6 +203,7 @@
       - { user: "{{ nike_db_user }}", password: "{{ nike_db_password }}" }
       - { user: "{{ periplus_db_user }}", password: "{{ periplus_db_password }}" }
       - { user: "{{ daedalus_db_user }}", password: "{{ daedalus_db_password }}" }
+      - { user: "{{ mnemosyne_db_user }}", password: "{{ mnemosyne_db_password }}" }
     no_log: true
 
   - name: Create application databases with owners
@@ -226,6 +227,7 @@
       - { name: "{{ nike_db_name }}", owner: "{{ nike_db_user }}" }
       - { name: "{{ periplus_db_name }}", owner: "{{ periplus_db_user }}" }
       - { name: "{{ daedalus_db_name }}", owner: "{{ daedalus_db_user }}" }
+      - { name: "{{ mnemosyne_db_name }}", owner: "{{ mnemosyne_db_user }}" }
 
   - name: Enable postgis and pg_trgm extensions in periplus database
     community.postgresql.postgresql_ext:
diff --git a/docs/ouranos.md b/docs/ouranos.md
index dca67c9..2372cb3 100644
--- a/docs/ouranos.md
+++ b/docs/ouranos.md
@@ -72,7 +72,7 @@ King of the Fairies orchestrating containers and managing MCP infrastructure.
 Intelligent and resourceful — the reliability of relational databases.
 
 - PostgreSQL 17 (port 5432)
-- Databases: `arke`, `anythingllm`, `gitea`, `hass`, `lobechat`, `mcp_switchboard`, `nextcloud`, `openwebui`, `periplus`, `spelunker`
+- Databases: `arke`, `anythingllm`, `gitea`, `hass`, `lobechat`, `mcp_switchboard`, `mnemosyne`, `nextcloud`, `openwebui`, `periplus`, `spelunker`
 
 ### ariel — Graph Database
 
@@ -297,6 +297,35 @@ ansible-playbook site.yml
 ansible-playbook sandbox_down.yml
 ```
 
+### Python Virtual Environment Setup
+
+The Ansible automation requires a Python virtual environment with the `ansible` package installed. Create and activate the environment from the `~` directory:
+
+```bash
+# Create virtual environment
+cd ~
+python3 -m venv env/ouranos
+
+# Activate environment
+source ~/env/ouranos/bin/activate
+
+# Install Ansible
+pip install ansible
+pip install ansible-core
+pip install ansible-community.postgresql
+```
+
+### Ansible Playbook Syntax Check
+
+Before running playbooks, use the `apsc.sh` utility (in PATH) to quickly validate YAML syntax:
+
+```bash
+# From the ansible directory
+apsc.sh
+
+# This will check all YAML files in the current directory for syntax errors
+```
+
 ### Terraform Workflow
 
 1. **Define** — Containers, networks, and resources in `*.tf` files