service/forum.md

@@ -162,6 +162,13 @@ To disable it:
 The documentation for this feature is found at
 https://meta.discourse.org/t/partial-read-only-mode/210401/18
 
+## Access database
+
+After entering the container, this command can be used to open a `psql` shell to
+the discourse PostgreSQL database:
+
+    sudo -u postgres psql discourse
+
 ## Pager playbook
 
 ### Email issues