+------------+     +---------------+     +-----------+
   | user       |     | role_has_user |     | role      |
   +------------+     +---------------+     +-----------+
   |id          |o-+  |id             |  +->|id         |<-+
   |node_id     |  +->|user_id        |  |  |name       |  |
   |up_id       |     |role_id        |o-+  |description|  |
   +------------+	  +---------------+     +-----------+  |
		                                                   |
   +----------------+     +------------+                   |
   | workflow       |     | job        |                   |
   +----------------+     +------------+                   |
+->|id              |  +->|id          |                   |
|  |job_id          |o-+  |name        |                   |
+-o|up_id           |     |role_id     |o------------------+
   |                |     |description |
   +----------------+	  +------------+