diff --git a/Core/API/SettingsAPI.class.php b/Core/API/SettingsAPI.class.php
index 26e4928..34b6b57 100644
--- a/Core/API/SettingsAPI.class.php
+++ b/Core/API/SettingsAPI.class.php
@@ -63,7 +63,6 @@ namespace Core\API\Settings {
     public function _execute(): bool {
        $key = $this->getParam("key");
        $sql = $this->context->getSQL();
-       $siteSettings = $this->context->getSettings();
 
        $settings = Settings::getAll($sql, $key, $this->isExternalCall());
        if ($settings !== null) {
diff --git a/Core/Configuration/CreateDatabase.class.php b/Core/Configuration/CreateDatabase.class.php
index fdd0f33..f173c7a 100644
--- a/Core/Configuration/CreateDatabase.class.php
+++ b/Core/Configuration/CreateDatabase.class.php
@@ -3,12 +3,24 @@
 namespace Core\Configuration;
 
 use Core\API\Request;
+use Core\Driver\Logger\Logger;
+use Core\Driver\SQL\Query\CreateTable;
 use Core\Driver\SQL\SQL;
 use Core\Objects\DatabaseEntity\Controller\DatabaseEntity;
 use PHPUnit\Util\Exception;
 
 class CreateDatabase {
 
+  private static ?Logger $logger = null;
+
+  public static function getLogger(SQL $sql): Logger {
+    if (self::$logger === null) {
+      self::$logger = new Logger("CreateDatabase", $sql);
+    }
+
+    return self::$logger;
+  }
+
   public static function createQueries(SQL $sql): array {
     $queries = array();
 
@@ -51,35 +63,54 @@ class CreateDatabase {
     }
   }
 
-  private static function loadEntities(SQL $sql, array &$queries): void {
-    $persistables = [];
-    $baseDirs = ["Core", "Site"];
-    foreach ($baseDirs as $baseDir) {
-      $entityDirectory = "./$baseDir/Objects/DatabaseEntity/";
-      if (file_exists($entityDirectory) && is_dir($entityDirectory)) {
-        $scan_arr = scandir($entityDirectory);
-        $files_arr = array_diff($scan_arr, array('.', '..'));
-        foreach ($files_arr as $file) {
-          $suffix = ".class.php";
-          if (endsWith($file, $suffix)) {
-            $className = substr($file, 0, strlen($file) - strlen($suffix));
-            $className = "\\$baseDir\\Objects\\DatabaseEntity\\$className";
-            $reflectionClass = new \ReflectionClass($className);
-            if ($reflectionClass->isSubclassOf(DatabaseEntity::class)) {
-              $method = "$className::getHandler";
-              $handler = call_user_func($method, $sql, null, true);
-              $persistables[$handler->getTableName()] = $handler;
-              foreach ($handler->getNMRelations() as $nmTableName => $nmRelation) {
-                $persistables[$nmTableName] = $nmRelation;
-              }
-            }
+  private static function getCreatedTables(SQL $sql, array $queries): ?array {
+    $createdTables = $sql->listTables();
+
+    if ($createdTables !== null) {
+      foreach ($queries as $query) {
+        if ($query instanceof CreateTable) {
+          $tableName = $query->getTableName();
+          if (!in_array($tableName, $createdTables)) {
+            $createdTables[] = $tableName;
           }
         }
       }
+    } else {
+      self::getLogger($sql)->warning("Error querying existing tables: " . $sql->getLastError());
     }
 
+    return $createdTables;
+  }
+
+  public static function createEntityQueries(SQL $sql, array $entityClasses, array &$queries, bool $skipExisting = false): void {
+
+    if (empty($entityClasses)) {
+      return;
+    }
+
+    // first, check what tables are already created
+    $createdTables = self::getCreatedTables($sql, $queries);
+    if ($createdTables === null) {
+      throw new \Exception("Error querying existing tables");
+    }
+
+    // then collect all persistable entities (tables, relations, etc.)
+    $persistables = [];
+    foreach ($entityClasses as $className) {
+      $reflectionClass = new \ReflectionClass($className);
+      if ($reflectionClass->isSubclassOf(DatabaseEntity::class)) {
+        $handler = ("$className::getHandler")($sql, null, true);
+        $persistables[$handler->getTableName()] = $handler;
+        foreach ($handler->getNMRelations() as $nmTableName => $nmRelation) {
+          $persistables[$nmTableName] = $nmRelation;
+        }
+      } else {
+        throw new \Exception("Class '$className' is not a subclass of DatabaseEntity");
+      }
+    }
+
+    // now order the persistable entities so all dependencies are met.
     $tableCount = count($persistables);
-    $createdTables = [];
     while (!empty($persistables)) {
       $prevCount = $tableCount;
       $unmetDependenciesTotal = [];
@@ -88,7 +119,7 @@ class CreateDatabase {
         $dependsOn = $persistable->dependsOn();
         $unmetDependencies = array_diff($dependsOn, $createdTables);
         if (empty($unmetDependencies)) {
-          $queries = array_merge($queries, $persistable->getCreateQueries($sql));
+          $queries = array_merge($queries, $persistable->getCreateQueries($sql, $skipExisting));
           $createdTables[] = $tableName;
           unset($persistables[$tableName]);
         } else {
@@ -104,6 +135,32 @@ class CreateDatabase {
     }
   }
 
+  private static function loadEntities(SQL $sql, array &$queries): void {
+
+    $classes = [];
+    $baseDirs = ["Core", "Site"];
+    foreach ($baseDirs as $baseDir) {
+      $entityDirectory = "./$baseDir/Objects/DatabaseEntity/";
+      if (file_exists($entityDirectory) && is_dir($entityDirectory)) {
+        $scan_arr = scandir($entityDirectory);
+        $files_arr = array_diff($scan_arr, [".", ".."]);
+        foreach ($files_arr as $file) {
+          $suffix = ".class.php";
+          if (endsWith($file, $suffix)) {
+            $className = substr($file, 0, strlen($file) - strlen($suffix));
+            $className = "\\$baseDir\\Objects\\DatabaseEntity\\$className";
+            $reflectionClass = new \ReflectionClass($className);
+            if ($reflectionClass->isSubclassOf(DatabaseEntity::class)) {
+              $classes[] = $className;
+            }
+          }
+        }
+      }
+    }
+
+    self::createEntityQueries($sql, $classes, $queries);
+  }
+
   public static function loadDefaultACL(SQL $sql, array &$queries): void {
     $query = $sql->insert("ApiPermission", ["method", "groups", "description", "is_core"]);
 
diff --git a/Core/Configuration/Settings.class.php b/Core/Configuration/Settings.class.php
index 4b8de70..71b7c6a 100644
--- a/Core/Configuration/Settings.class.php
+++ b/Core/Configuration/Settings.class.php
@@ -62,7 +62,14 @@ class Settings {
   }
 
   public static function getAll(?SQL $sql, ?string $pattern = null, bool $external = false): ?array {
-    $query = $sql->select("name", "value")->from("Settings");
+
+    // We do not have a Settings table yet, we might still be in installation phase
+    if (!$sql->tableExists("Settings")) {
+      return null;
+    }
+
+    $query = $sql->select("name", "value")
+      ->from("Settings");
 
     if ($pattern) {
       $query->where(new CondRegex(new Column("name"), $pattern));
diff --git a/Core/Documents/Install.class.php b/Core/Documents/Install.class.php
index 5c7e8f5..bcc5a51 100644
--- a/Core/Documents/Install.class.php
+++ b/Core/Documents/Install.class.php
@@ -19,7 +19,6 @@ namespace Documents\Install {
 
   use Core\Configuration\Configuration;
   use Core\Configuration\CreateDatabase;
-  use Core\Driver\SQL\Expression\Count;
   use Core\Driver\SQL\SQL;
   use Core\Elements\Body;
   use Core\Elements\Head;
@@ -187,7 +186,7 @@ namespace Documents\Install {
       }
 
       $sql = $context->getSQL();
-      if (!$sql || !$sql->isConnected()) {
+      if (!$sql || !$sql->isConnected() || !$sql->tableExists(User::getHandler($sql)->getTableName())) {
         return self::DATABASE_CONFIGURATION;
       }
 
@@ -439,9 +438,12 @@ namespace Documents\Install {
       $context = $this->getDocument()->getContext();
       if ($this->getParameter("prev") === "true") {
         // TODO: drop the previous database here?
+        /*
         $success = $context->getConfig()->delete("\\Site\\Configuration\\Database");
         $msg = $success ? "" : error_get_last();
         return ["success" => $success, "msg" => $msg];
+        */
+        return ["success" => false, "msg" => "Cannot revert this installation step."];
       }
 
       $username = $this->getParameter("username");
@@ -755,7 +757,7 @@ namespace Documents\Install {
             ["title" => "Password", "name" => "password", "type" => "password", "required" => true],
             ["title" => "Confirm Password", "name" => "confirmPassword", "type" => "password", "required" => true],
           ],
-          "previousButton" => true
+          "previousButton" => false,
         ],
         self::ADD_MAIL_SERVICE => [
           "title" => "Optional: Add Mail Service",
diff --git a/Core/Driver/SQL/Expression/DateAdd.class.php b/Core/Driver/SQL/Expression/DateAdd.class.php
index 430c2ec..7a7a678 100644
--- a/Core/Driver/SQL/Expression/DateAdd.class.php
+++ b/Core/Driver/SQL/Expression/DateAdd.class.php
@@ -6,7 +6,7 @@ use Core\Driver\SQL\Column\Column;
 use Core\Driver\SQL\MySQL;
 use Core\Driver\SQL\PostgreSQL;
 use Core\Driver\SQL\SQL;
-use Core\External\PHPMailer\Exception;
+use Exception;
 
 class DateAdd extends Expression {
 
diff --git a/Core/Driver/SQL/Expression/DateSub.class.php b/Core/Driver/SQL/Expression/DateSub.class.php
index d953234..1235c99 100644
--- a/Core/Driver/SQL/Expression/DateSub.class.php
+++ b/Core/Driver/SQL/Expression/DateSub.class.php
@@ -6,7 +6,7 @@ use Core\Driver\SQL\Column\Column;
 use Core\Driver\SQL\MySQL;
 use Core\Driver\SQL\PostgreSQL;
 use Core\Driver\SQL\SQL;
-use Core\External\PHPMailer\Exception;
+use Exception;
 
 class DateSub extends Expression {
 
diff --git a/Core/Driver/SQL/MySQL.class.php b/Core/Driver/SQL/MySQL.class.php
index adf5f8b..0300a6b 100644
--- a/Core/Driver/SQL/MySQL.class.php
+++ b/Core/Driver/SQL/MySQL.class.php
@@ -375,7 +375,10 @@ class MySQL extends SQL {
         list ($name, $alias) = $parts;
         return "`$name` $alias";
       } else {
-        return "`$table`";
+        $parts = explode(".", $table);
+        return implode(".", array_map(function ($n) {
+          return "`$n`";
+        }, $parts));
       }
     }
   }
@@ -484,6 +487,27 @@ class MySQL extends SQL {
 
     return $res && $res[0]["count"] > 0;
   }
+
+  public function listTables(): ?array {
+    $tableSchema = $this->connectionData->getProperty("database");
+    $res = $this->select("TABLE_NAME")
+      ->from("information_schema.TABLES")
+      ->where(new Compare("TABLE_SCHEMA", $tableSchema, "=", true))
+      ->where(new CondLike(new Column("TABLE_TYPE"), "BASE TABLE"))
+      ->execute();
+
+    if ($res !== false) {
+      $tableNames = [];
+
+      foreach ($res as $row) {
+        $tableNames[] = $row["TABLE_NAME"];
+      }
+
+      return $tableNames;
+    }
+
+    return null;
+  }
 }
 
 class RowIteratorMySQL extends RowIterator {
diff --git a/Core/Driver/SQL/PostgreSQL.class.php b/Core/Driver/SQL/PostgreSQL.class.php
index fe2527c..832adac 100644
--- a/Core/Driver/SQL/PostgreSQL.class.php
+++ b/Core/Driver/SQL/PostgreSQL.class.php
@@ -334,7 +334,10 @@ class PostgreSQL extends SQL {
         list ($name, $alias) = $parts;
         return "\"$name\" $alias";
       } else {
-        return "\"$table\"";
+        $parts = explode(".", $table);
+        return implode(".", array_map(function ($n) {
+          return "\"$n\"";
+        }, $parts));
       }
     }
   }
@@ -463,6 +466,28 @@ class PostgreSQL extends SQL {
 
     return $res && $res[0]["count"] > 0;
   }
+
+
+
+  public function listTables(): ?array {
+    $tableSchema = $this->connectionData->getProperty("database");
+    $res = $this->select("tablename")
+      ->from("pg_tables")
+      ->where(new Compare("schemaname", $tableSchema))
+      ->execute();
+
+    if ($res !== false) {
+      $tableNames = [];
+
+      foreach ($res as $row) {
+        $tableNames[] = $row["tablename"];
+      }
+
+      return $tableNames;
+    }
+
+    return null;
+  }
 }
 
 class RowIteratorPostgreSQL extends RowIterator {
diff --git a/Core/Driver/SQL/Query/CreateTrigger.class.php b/Core/Driver/SQL/Query/CreateTrigger.class.php
index dbb1289..1e2c5e1 100644
--- a/Core/Driver/SQL/Query/CreateTrigger.class.php
+++ b/Core/Driver/SQL/Query/CreateTrigger.class.php
@@ -2,7 +2,10 @@
 
 namespace Core\Driver\SQL\Query;
 
+use Core\Driver\SQL\MySQL;
+use Core\Driver\SQL\PostgreSQL;
 use Core\Driver\SQL\SQL;
+use Exception;
 
 class CreateTrigger extends Query {
 
@@ -11,6 +14,9 @@ class CreateTrigger extends Query {
   private string $event;
   private string $tableName;
   private array $parameters;
+
+  private bool $ifNotExist;
+
   private ?CreateProcedure $procedure;
 
   public function __construct(SQL $sql, string $triggerName) {
@@ -21,6 +27,7 @@ class CreateTrigger extends Query {
     $this->event = "";
     $this->parameters = [];
     $this->procedure = null;
+    $this->ifNotExist = false;
   }
 
   public function before(): CreateTrigger {
@@ -28,6 +35,11 @@ class CreateTrigger extends Query {
     return $this;
   }
 
+  public function onlyIfNotExist(): CreateTrigger {
+    $this->ifNotExist = true;
+    return $this;
+  }
+
   public function after(): CreateTrigger {
     $this->time = "AFTER";
     return $this;
@@ -70,7 +82,20 @@ class CreateTrigger extends Query {
     $tableName = $this->sql->tableName($this->getTable());
 
     $params = array();
-    $query = "CREATE TRIGGER $name $time $event ON $tableName FOR EACH ROW ";
+
+    if ($this->sql instanceof MySQL) {
+      $query = "CREATE TRIGGER";
+      if ($this->ifNotExist) {
+        $query .= " IF NOT EXISTS";
+      }
+    } else if ($this->sql instanceof PostgreSQL) {
+      $ifNotExists = $this->ifNotExist ? " OR REPLACE" : "";
+      $query = "CREATE$ifNotExists TRIGGER";
+    } else {
+      throw new Exception("CreateTrigger Not implemented for driver type: " . get_class($this->sql));
+    }
+
+    $query .= " $name $time $event ON $tableName FOR EACH ROW ";
     $triggerBody = $this->sql->createTriggerBody($this, $this->parameters);
     if ($triggerBody === null) {
       return null;
diff --git a/Core/Driver/SQL/SQL.class.php b/Core/Driver/SQL/SQL.class.php
index 714c698..39ba926 100644
--- a/Core/Driver/SQL/SQL.class.php
+++ b/Core/Driver/SQL/SQL.class.php
@@ -130,6 +130,8 @@ abstract class SQL {
   // Schema
   public abstract function tableExists(string $tableName): bool;
 
+  public abstract function listTables(): ?array;
+
   /**
    * @param Query $query
    * @param int $fetchType
diff --git a/Core/Objects/Context.class.php b/Core/Objects/Context.class.php
index 334e3af..3f84a6a 100644
--- a/Core/Objects/Context.class.php
+++ b/Core/Objects/Context.class.php
@@ -125,10 +125,14 @@ class Context {
 
   public function parseCookies(): void {
 
-    if ($this->sql) {
-      if (isset($_COOKIE['session']) && is_string($_COOKIE['session']) && !empty($_COOKIE['session'])) {
-        $this->loadSession($_COOKIE['session']);
-      }
+    $settings = $this->getSettings();
+    if (!$settings->isInstalled()) {
+      // we cannot process user sessions or localization yet.
+      return;
+    }
+
+    if (isset($_COOKIE['session']) && is_string($_COOKIE['session']) && !empty($_COOKIE['session'])) {
+      $this->loadSession($_COOKIE['session']);
     }
 
     // set language by priority: 1. GET parameter, 2. cookie, 3. user's settings, 4. accept-language header
diff --git a/Core/Objects/DatabaseEntity/Controller/DatabaseEntityHandler.php b/Core/Objects/DatabaseEntity/Controller/DatabaseEntityHandler.php
index 94b7cfe..49466e0 100644
--- a/Core/Objects/DatabaseEntity/Controller/DatabaseEntityHandler.php
+++ b/Core/Objects/DatabaseEntity/Controller/DatabaseEntityHandler.php
@@ -713,13 +713,13 @@ class DatabaseEntityHandler implements Persistable {
     return $res;
   }
 
-  public function getCreateQueries(SQL $sql): array {
+  public function getCreateQueries(SQL $sql, bool $canExist = false): array {
 
     $queries = [];
     $table = $this->getTableName();
 
     // Create Table
-    $queries[] = $this->getTableQuery($sql);
+    $queries[] = $this->getTableQuery($sql, $canExist);
 
     // pre defined values
     $getPredefinedValues = $this->entityClass->getMethod("getPredefinedValues");
@@ -733,43 +733,64 @@ class DatabaseEntityHandler implements Persistable {
     $entityLogConfig = $entityLogConfig->getValue();
 
     if (isset($entityLogConfig["insert"]) && $entityLogConfig["insert"] === true) {
-      $queries[] = $sql->createTrigger("${table}_trg_insert")
+      $trigger = $sql->createTrigger("${table}_trg_insert")
         ->after()->insert($table)
         ->exec(new CreateProcedure($sql, "InsertEntityLog"), [
           "tableName" => new CurrentTable(),
           "entityId" => new CurrentColumn("id"),
           "lifetime" => $entityLogConfig["lifetime"] ?? 90,
         ]);
+
+      if ($canExist) {
+        $trigger->onlyIfNotExist();
+      }
+
+      $queries[] = $trigger;
     }
 
     if (isset($entityLogConfig["update"]) && $entityLogConfig["update"] === true) {
-      $queries[] = $sql->createTrigger("${table}_trg_update")
+      $trigger = $sql->createTrigger("${table}_trg_update")
         ->after()->update($table)
         ->exec(new CreateProcedure($sql, "UpdateEntityLog"), [
           "tableName" => new CurrentTable(),
           "entityId" => new CurrentColumn("id"),
         ]);
+
+      if ($canExist) {
+        $trigger->onlyIfNotExist();
+      }
+
+      $queries[] = $trigger;
     }
 
     if (isset($entityLogConfig["delete"]) && $entityLogConfig["delete"] === true) {
-      $queries[] = $sql->createTrigger("${table}_trg_delete")
+      $trigger = $sql->createTrigger("${table}_trg_delete")
         ->after()->delete($table)
         ->exec(new CreateProcedure($sql, "DeleteEntityLog"), [
           "tableName" => new CurrentTable(),
           "entityId" => new CurrentColumn("id"),
         ]);
+
+      if ($canExist) {
+        $trigger->onlyIfNotExist();
+      }
+
+      $queries[] = $trigger;
     }
 
 
     return $queries;
   }
 
-  public function getTableQuery(SQL $sql): CreateTable {
+  public function getTableQuery(SQL $sql, bool $canExist = false): CreateTable {
     $query = $sql->createTable($this->tableName)
-      ->onlyIfNotExists()
       ->addSerial("id")
       ->primaryKey("id");
 
+    if ($canExist) {
+      $query->onlyIfNotExists();
+    }
+
     foreach ($this->columns as $column) {
       $query->addColumn($column);
     }
diff --git a/Core/core.php b/Core/core.php
index b69730f..4041284 100644
--- a/Core/core.php
+++ b/Core/core.php
@@ -10,7 +10,7 @@ if (is_file($autoLoad)) {
   require_once $autoLoad;
 }
 
-const WEBBASE_VERSION = "2.4.3";
+const WEBBASE_VERSION = "2.4.4";
 
 spl_autoload_extensions(".php");
 spl_autoload_register(function ($class) {
diff --git a/test/DatabaseEntity.test.php b/test/DatabaseEntity.test.php
index 016e0c8..61ba1bb 100644
--- a/test/DatabaseEntity.test.php
+++ b/test/DatabaseEntity.test.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace {
+
 use Core\API\Parameter\Parameter;
 use Core\Driver\SQL\Query\CreateTable;
 use Core\Driver\SQL\SQL;
@@ -100,6 +102,28 @@ class DatabaseEntityTest extends \PHPUnit\Framework\TestCase {
   public function testDropTable() {
     $this->assertTrue(self::$SQL->drop(self::$HANDLER->getTableName())->execute());
   }
+
+  public function testTableNames() {
+    $sql = self::$SQL;
+    $this->assertEquals("TestEntity", TestEntity::getHandler($sql, null, true)->getTableName());
+    $this->assertEquals("TestEntityInherit", TestEntityInherit::getHandler($sql, null, true)->getTableName());
+    $this->assertEquals("TestEntityInherit", OverrideNameSpace\TestEntityInherit::getHandler($sql, null, true)->getTableName());
+  }
+
+  public function testCreateQueries() {
+    $queries = [];
+    $entities = [TestEntity::class, TestEntityInherit::class, OverrideNameSpace\TestEntityInherit::class];
+    \Core\Configuration\CreateDatabase::createEntityQueries(self::$SQL, $entities, $queries);
+    $this->assertCount(2, $queries);
+
+    $tables = [];
+    foreach ($queries as $query) {
+      $this->assertInstanceOf(CreateTable::class, $query);
+      $tables[] = $query->getTableName();
+    }
+
+    $this->assertEquals(["TestEntity", "TestEntityInherit"], $tables);
+  }
 }
 
 class TestEntity extends DatabaseEntity {
@@ -109,4 +133,16 @@ class TestEntity extends DatabaseEntity {
   public float $d;
   public \DateTime $e;
   public ?int $f;
-}
\ No newline at end of file
+}
+
+class TestEntityInherit extends DatabaseEntity {
+  public TestEntity $rel;
+}
+
+}
+
+namespace OverrideNameSpace {
+  class TestEntityInherit extends \TestEntityInherit {
+    public int $new;
+  }
+}