diff --git a/livesupport/modules/alib/var/alib.php b/livesupport/modules/alib/var/alib.php
index 0997e3d9e..b776f8086 100644
--- a/livesupport/modules/alib/var/alib.php
+++ b/livesupport/modules/alib/var/alib.php
@@ -23,7 +23,7 @@
  
  
     Author   : $Author: tomas $
-    Version  : $Revision: 1.5 $
+    Version  : $Revision: 1.6 $
     Location : $Source: /home/paul/cvs2svn-livesupport/newcvsrepo/livesupport/modules/alib/var/alib.php,v $
 
 ------------------------------------------------------------------------------*/
@@ -37,7 +37,7 @@ define('ALIBERR_NOTEXISTS', 31);
  *   authentication/authorization class
  *
  *  @author  $Author: tomas $
- *  @version $Revision: 1.5 $
+ *  @version $Revision: 1.6 $
  *  @see Subjects
  *  @see GreenBox
  */
@@ -487,8 +487,8 @@ class Alib extends Subjects{
     {
         parent::install();
         $this->dbc->query("CREATE TABLE {$this->permTable} (
-            permid int not null,
-            subj int,
+            permid int not null PRIMARY KEY,
+            subj int REFERENCES {$this->subjTable} ON DELETE CASCADE,
             action varchar(20),
             obj int,
             type char(1)
@@ -500,8 +500,8 @@ class Alib extends Subjects{
         $this->dbc->createSequence("{$this->permTable}_id_seq");
 
         $this->dbc->query("CREATE TABLE {$this->sessTable} (
-            sessid char(32) not null,
-            userid int,
+            sessid char(32) not null PRIMARY KEY,
+            userid int REFERENCES {$this->subjTable} ON DELETE CASCADE,
             login varchar(255),
             ts timestamp
         )");
diff --git a/livesupport/modules/alib/var/class.php b/livesupport/modules/alib/var/class.php
index d034a6e62..cf2ff4cc6 100644
--- a/livesupport/modules/alib/var/class.php
+++ b/livesupport/modules/alib/var/class.php
@@ -23,7 +23,7 @@
  
  
     Author   : $Author: tomas $
-    Version  : $Revision: 1.2 $
+    Version  : $Revision: 1.3 $
     Location : $Source: /home/paul/cvs2svn-livesupport/newcvsrepo/livesupport/modules/alib/var/class.php,v $
 
 ------------------------------------------------------------------------------*/
@@ -35,7 +35,7 @@ require_once "mtree.php";
  *  class for 'object classes' handling - i.e. groups of object in tree
  *
  *  @author  $Author: tomas $
- *  @version $Revision: 1.2 $
+ *  @version $Revision: 1.3 $
  *  @see Mtree
  *  @see Subj
  */
@@ -293,7 +293,7 @@ class ObjClasses extends Mtree{
     {
         parent::install();
         $this->dbc->query("CREATE TABLE {$this->classTable} (
-            id int not null,
+            id int not null PRIMARY KEY,
             cname varchar(20)
         )");
         $this->dbc->query("CREATE UNIQUE INDEX {$this->classTable}_id_idx
diff --git a/livesupport/modules/alib/var/mtree.php b/livesupport/modules/alib/var/mtree.php
index 71226eb46..112a185fa 100644
--- a/livesupport/modules/alib/var/mtree.php
+++ b/livesupport/modules/alib/var/mtree.php
@@ -23,7 +23,7 @@
  
  
     Author   : $Author: tomas $
-    Version  : $Revision: 1.2 $
+    Version  : $Revision: 1.3 $
     Location : $Source: /home/paul/cvs2svn-livesupport/newcvsrepo/livesupport/modules/alib/var/Attic/mtree.php,v $
 
 ------------------------------------------------------------------------------*/
@@ -50,7 +50,7 @@ define('ALIBERR_MTREE', 10);
  *    );
  *   </code></pre>
  *  @author  $Author: tomas $
- *  @version $Revision: 1.2 $
+ *  @version $Revision: 1.3 $
  *  @see ObjClasses
  */
 class Mtree{
@@ -572,7 +572,7 @@ class Mtree{
     function install()
     {
         $this->dbc->query("CREATE TABLE {$this->treeTable} (
-            id int not null,
+            id int not null PRIMARY KEY,
             name varchar(255) not null default'',
             parid int,
             lft int,
diff --git a/livesupport/modules/alib/var/subj.php b/livesupport/modules/alib/var/subj.php
index 8ae6ff18c..72d9e03f7 100644
--- a/livesupport/modules/alib/var/subj.php
+++ b/livesupport/modules/alib/var/subj.php
@@ -23,7 +23,7 @@
  
  
     Author   : $Author: tomas $
-    Version  : $Revision: 1.2 $
+    Version  : $Revision: 1.3 $
     Location : $Source: /home/paul/cvs2svn-livesupport/newcvsrepo/livesupport/modules/alib/var/subj.php,v $
 
 ------------------------------------------------------------------------------*/
@@ -39,7 +39,7 @@ define('ALIBERR_BADSMEMB', 21);
  *   (allow adding users to groups or groups to groups)
  *   
  *  @author  $Author: tomas $
- *  @version $Revision: 1.2 $
+ *  @version $Revision: 1.3 $
  *  @see ObjClasses
  *  @see Alib
  */
@@ -503,7 +503,7 @@ class Subjects extends ObjClasses{
     {
         parent::install();
         $this->dbc->query("CREATE TABLE {$this->subjTable} (
-            id int not null,
+            id int not null PRIMARY KEY,
             login varchar(255) not null default'',
             pass varchar(255) not null default'',
             type char(1) not null default 'U'
@@ -515,7 +515,7 @@ class Subjects extends ObjClasses{
         $this->dbc->createSequence("{$this->subjTable}_id_seq");
 
         $this->dbc->query("CREATE TABLE {$this->smembTable} (
-            id int not null,
+            id int not null PRIMARY KEY,
             uid int not null default 0,
             gid int not null default 0,
             level int not null default 0,