diff --git a/phpgwapi/inc/adodb/datadict/datadict-postgres.inc.php b/phpgwapi/inc/adodb/datadict/datadict-postgres.inc.php
index a2034f5645..8c1bd3544a 100644
--- a/phpgwapi/inc/adodb/datadict/datadict-postgres.inc.php
+++ b/phpgwapi/inc/adodb/datadict/datadict-postgres.inc.php
@@ -134,10 +134,11 @@ class ADODB2_postgres extends ADODB_DataDict {
 			if (($not_null = preg_match('/NOT NULL/i',$v))) {
 				$v = preg_replace('/NOT NULL/i','',$v);
 			}
-			if (preg_match('/^([^ ]+) .*(DEFAULT [^ ]+)/',$v,$matches)) {
+			if (preg_match('/^([^ ]+) .*DEFAULT ([^ ]+)/',$v,$matches)) {
 				list(,$colname,$default) = $matches;
-				$sql[] = $alter . str_replace($default,'',$v);
-				$sql[] = 'ALTER TABLE '.$tabname.' ALTER COLUMN '.$colname.' SET ' . $default;
+				$sql[] = $alter . str_replace('DEFAULT '.$default,'',$v);
+				$sql[] = 'UPDATE '.$tabname.' SET '.$colname.'='.$default;
+				$sql[] = 'ALTER TABLE '.$tabname.' ALTER COLUMN '.$colname.' SET DEFAULT ' . $default;
 			} else {				
 				$sql[] = $alter . $v;
 			}
diff --git a/phpgwapi/inc/class.schema_proc.inc.php b/phpgwapi/inc/class.schema_proc.inc.php
index 57007450d1..83291c26cf 100644
--- a/phpgwapi/inc/class.schema_proc.inc.php
+++ b/phpgwapi/inc/class.schema_proc.inc.php
@@ -223,29 +223,62 @@
 		 */
 		function RenameTable($sOldTableName, $sNewTableName)
 		{
-			if ($this->sType == 'pgsql') $this->_PostgresTestDropOldSequence($sTableName);
+			// if we have an old postgres sequence or index (the ones not linked to the table), 
+			// we create a new table, copy the content and drop the old one
+			if ($this->sType == 'pgsql')
+			{
+				$table_def = $this->GetTableDefinition($sOldTableName);
 
+				if ($this->_PostgresHasOldSequence($sOldTableName) || count($table_def['pk']) ||
+					count($table_def['ix']) || count($table_def['uc']))
+				{
+					if ($this->adodb->BeginTrans() &&
+						$this->CreateTable($sNewTableName,$table_def) &&
+						$this->m_odb->query("INSERT INTO $sNewTableName SELECT * FROM $sOldTableName",__LINE__,__FILE__) &&
+						$this->DropTable($sOldTableName))
+					{
+						$this->adodb->CommitTrans();
+						return 2;
+					}
+					$this->adodb->RollbackTrans();
+					return 0;
+				}
+			}
 			$aSql = $this->dict->RenameTableSQL($sOldTableName, $sNewTableName);
 
 			return $this->ExecuteSQLArray($aSql,2,'RenameTableSQL(%1,%2) sql=%3',False,$sOldTableName,$sNewTableName,$aSql);
 		}
 		
 		/**
-		 * Check if we have an old, not automaticaly droped sequence and drop it
+		 * Check if we have an old, not automaticaly droped sequence
 		 *
-		 * 
-		 * @param $sTableName
+		 * @param string $sTableName
+		 * @param boolean/string sequence-name or false
 		 */
-		function _PostgresTestDropOldSequence($sTableName)
+		function _PostgresHasOldSequence($sTableName)
 		{
-			if ($this->sType != 'pgsql') return;
+			if ($this->sType != 'pgsql') return false;
 
 			$seq = $this->adodb->GetOne("SELECT d.adsrc FROM pg_attribute a, pg_class c, pg_attrdef d WHERE c.relname='$sTableName' AND c.oid=d.adrelid AND d.adsrc LIKE '%seq_$sTableName%' AND a.attrelid=c.oid AND d.adnum=a.attnum");
 			
 			if ($seq && preg_match('/^nextval\(\'(.*)\'/',$seq,$matches))
 			{
 				
-				$this->query('DROP SEQUENCE '.$matches[1],__LINE__,__FILE__);
+				return $matches[1];
+			}
+			return false;
+		}
+
+		/**
+		 * Check if we have an old, not automaticaly droped sequence and drop it
+		 *
+		 * @param $sTableName
+		 */
+		function _PostgresTestDropOldSequence($sTableName)
+		{
+			if ($this->sType == 'pgsql' && ($seq = $this->_PostgresHasOldSequence($sTableName)))
+			{
+				$this->query('DROP SEQUENCE '.$seq,__LINE__,__FILE__);
 			}
 		}
 
@@ -355,7 +388,7 @@
 				}
 				else
 				{
-					foreach($this->dict->MetaIndexes($sTableName) as $idx => $idx_data)
+					foreach($indexes as $idx => $idx_data)
 					{
 						if (strtolower(implode(':',$idx_data['columns'])) == implode(':',$aColumnNames))
 						{
@@ -1014,6 +1047,12 @@
 						else
 						{
 							$definition['fd'][$name]['type'] = 'int';
+							// detect postgres type-spec and remove it
+							if ($this->sType == 'pgsql' && $column->has_default && preg_match('/\(([^)])\)::/',$column->default_value,$matches))
+							{
+								$definition['fd'][$name]['default'] = $matches[1];
+								$column->has_default = False;
+							}
 						}
 						break;
 				}
diff --git a/phpgwapi/setup/tables_update_0_9_14.inc.php b/phpgwapi/setup/tables_update_0_9_14.inc.php
index 48127963f6..d915aeb7e5 100644
--- a/phpgwapi/setup/tables_update_0_9_14.inc.php
+++ b/phpgwapi/setup/tables_update_0_9_14.inc.php
@@ -572,8 +572,17 @@
 	$test[] = '0.9.14.502';
 	function phpgwapi_upgrade0_9_14_502()
 	{
-		$GLOBALS['phpgw_setup']->oProc->RenameTable('phpgw_preferences','old_preferences');
-
+		// because of all the trouble with sequences and indexes in the global namespace, 
+		// we use an additional temp. table for postgres and not rename the existing one, but drop it.
+		if ($GLOBALS['phpgw_setup']->oProc->sType == 'pgsql')	
+		{
+			$GLOBALS['phpgw_setup']->oProc->query("SELEcT * INTO TEMPORARY TABLE old_preferences FROM phpgw_preferences",__LINE__,__FILE__);
+			$GLOBALS['phpgw_setup']->oProc->DropTable('phpgw_preferences');
+		}
+		else
+		{
+			$GLOBALS['phpgw_setup']->oProc->RenameTable('phpgw_preferences','old_preferences');
+		}
 		$GLOBALS['phpgw_setup']->oProc->CreateTable('phpgw_preferences',array(
 			'fd' => array(
 				'preference_owner' => array('type' => 'int','precision' => '4','nullable' => False),
@@ -616,12 +625,24 @@
 	$test[] = '0.9.14.503';
 	function phpgwapi_upgrade0_9_14_503()
 	{
-		$GLOBALS['phpgw_setup']->oProc->AddColumn('phpgw_addressbook','last_mod',array(
-			'type' => 'int',
-			'precision' => '4',
-			'nullable' => False
-		));
-
+		// we create the column for postgres nullable, set all its values to 0 and set it NOT NULL
+		if ($GLOBALS['phpgw_setup']->oProc->sType == 'pgsql')
+		{
+			$GLOBALS['phpgw_setup']->oProc->AddColumn('phpgw_addressbook','last_mod',array(
+				'type' => 'int',
+				'precision' => '4',
+			));
+			$GLOBALS['phpgw_setup']->oProc->query("UPDATE phpgw_addressbook SET last_mod=0",__LINE__,__FILE__);
+			$GLOBALS['phpgw_setup']->oProc->query("ALTER TABLE phpgw_addressbook ALTER COLUMN last_mod SET NOT NULL",__LINE__,__FILE__);
+		}
+		else
+		{
+			$GLOBALS['phpgw_setup']->oProc->AddColumn('phpgw_addressbook','last_mod',array(
+				'type' => 'int',
+				'precision' => '4',
+				'nullable' => false,
+			));
+		}
 		$GLOBALS['setup_info']['phpgwapi']['currentver'] = '0.9.14.504';
 		return $GLOBALS['setup_info']['phpgwapi']['currentver'];
 	}
@@ -629,12 +650,24 @@
 	$test[] = '0.9.14.504';
 	function phpgwapi_upgrade0_9_14_504()
 	{
-		$GLOBALS['phpgw_setup']->oProc->AddColumn('phpgw_categories','last_mod',array(
-			'type' => 'int',
-			'precision' => '4',
-			'nullable' => False
-		));
-
+		// we create the column for postgres nullable, set all its values to 0 and set it NOT NULL
+		if ($GLOBALS['phpgw_setup']->oProc->sType == 'pgsql')
+		{
+			$GLOBALS['phpgw_setup']->oProc->AddColumn('phpgw_categories','last_mod',array(
+				'type' => 'int',
+				'precision' => '4',
+			));
+			$GLOBALS['phpgw_setup']->oProc->query("UPDATE phpgw_categories SET last_mod=0",__LINE__,__FILE__);
+			$GLOBALS['phpgw_setup']->oProc->query("ALTER TABLE phpgw_categories ALTER COLUMN last_mod SET NOT NULL",__LINE__,__FILE__);
+		}
+		else
+		{
+			$GLOBALS['phpgw_setup']->oProc->AddColumn('phpgw_categories','last_mod',array(
+				'type' => 'int',
+				'precision' => '4',
+				'nullable' => false,
+			));
+		}
 		$GLOBALS['setup_info']['phpgwapi']['currentver'] = '0.9.14.505';
 		return $GLOBALS['setup_info']['phpgwapi']['currentver'];
 	}
@@ -642,6 +675,8 @@
 	$test[] = '0.9.14.505';
 	function phpgwapi_upgrade0_9_14_505()
 	{
+		// postgres cant convert a column containing empty strings to int, updating them to '0' first
+		$GLOBALS['phpgw_setup']->oProc->query("UPDATE phpgw_access_log SET lo='0' WHERE lo=''",__LINE__,__FILE__);
 		$GLOBALS['phpgw_setup']->oProc->AlterColumn('phpgw_access_log','lo',array(
 			'type' => 'int',
 			'precision' => '4',
@@ -1323,10 +1358,6 @@
 	$test[] = '0.9.99.020';
 	function phpgwapi_upgrade0_9_99_020()
 	{
-		// at least for postgres we need to change the colum-type, else we get an error in RefreshTable
-		$GLOBALS['phpgw_setup']->oProc->AlterColumn('phpgw_app_sessions','loginid',array(
-			'type' => 'int','precision' => '4','nullable' => False
-		));
 		$GLOBALS['phpgw_setup']->oProc->RefreshTable('phpgw_app_sessions',array(
 			'fd' => array(
 				'sessionid' => array('type' => 'varchar','precision' => '128','nullable' => False),