data model adapted to split between user and profile

doc/source/architecture/erdmodel.plantuml.txt

@@ -10,13 +10,23 @@ entity "user" as user {
   *id : number <<generated>>
   --
   *nickname : text(25)
+  *created: datetime
+  *updated: datetime
+}
+
+entity user_profile {
+  *id : number <<generated>>
+  *userid
+  --
   pronouns : text(25)
   fullname: text(100)
   volunteerwork: text(4000) 
   freetext: text(4000)
+  *profile_visible: bool
   *created: datetime
   *updated: datetime
 }
+user ||-o{ user_profile : user_has_profile
 
 entity user_address {
   *id : number <<generated>>