diff --git a/db_structure.xml b/db_structure.xml
index c24c2c669ac..ddb8c44d19d 100644
--- a/db_structure.xml
+++ b/db_structure.xml
@@ -310,6 +310,102 @@
+
+
+ *dbprefix*principalgroups
+
+
+
+
+ id
+ integer
+ 0
+ true
+ 1
+ true
+ 4
+
+
+
+ principal_id
+ integer
+
+ true
+ true
+ 4
+
+
+
+ member_id
+ integer
+
+ true
+ true
+ 4
+
+
+
+ principals_members_index
+ true
+
+ principal_id
+ ascending
+
+
+ member_id
+ ascending
+
+
+
+
+
+
+
+
+
+ *dbprefix*principals
+
+
+
+
+ id
+ integer
+ 0
+ true
+ 1
+ true
+ 4
+
+
+
+ uri
+ text
+
+ false
+ 255
+
+
+
+ displayname
+ text
+
+ false
+ 255
+
+
+
+ uri
+ true
+
+ uri
+ ascending
+
+
+
+
+
+
+