Make add a postmaster user and check for its existence on

DESIGN.md

@@ -25,16 +25,15 @@ We need:
 
 ## Database structure
 
-```
-config/
-  domain: "example.com"
-domains/
-  example.com/
-    accounts/
-      foo@example.com/
-        config/
-        emails/
-    config/
-      key: []byte(...)
-      cert: []byte(...)
-```
+I'm not sure what storm does under the hood. It seems clever. We have the
+following, though:
+
+* K-V store
+  * `config/domain`
+  * `domains/<domain>/config/cert`
+  * `domains/<domain>/config/key`
+* ORM
+  * `Account`
+    * `Username`
+    * `Admin`
+    * `PasswordHash`