diff --git a/front/asset.form.php b/front/asset.form.php
index fe666f5..3cfabf9 100644
--- a/front/asset.form.php
+++ b/front/asset.form.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * -------------------------------------------------------------------------
  * UrBackup plugin for GLPI
@@ -70,16 +72,8 @@ if (isset($_POST['disconnect'])) {
         Html::displayRightError();
     }
 
-    global $DB;
-    
-    $link = ServerAsset::getLinkForAsset($itemtype, $items_id, false);
+    $result = ServerAsset::disconnectAsset($itemtype, $items_id);
 
-    if ($link === null) {
-        Html::displayValidationError(__('Asset is not linked to any server'));
-    }
-
-    $result = $DB->delete('glpi_plugin_urbackup_serverassets', ['id' => (int) $link['id']]);
-    
     if ($result) {
         $item->getFromDB($items_id);
         Html::redirect($item->getLinkURL());
diff --git a/front/config.form.php b/front/config.form.php
index db0bb8c..5041d4e 100644
--- a/front/config.form.php
+++ b/front/config.form.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use GlpiPlugin\Urbackup\Config;
 use Html;
 
diff --git a/front/server.form.php b/front/server.form.php
index 22e2037..4dc9b20 100644
--- a/front/server.form.php
+++ b/front/server.form.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use GlpiPlugin\Urbackup\Profile;
 use GlpiPlugin\Urbackup\Server;
 use GlpiPlugin\Urbackup\ServerAsset;
diff --git a/front/server.php b/front/server.php
index 447ced7..93b360a 100644
--- a/front/server.php
+++ b/front/server.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use GlpiPlugin\Urbackup\Profile;
 use GlpiPlugin\Urbackup\Server;
 use Html;
diff --git a/front/server_test.ajax.php b/front/server_test.ajax.php
index 00bfe6f..937bf2c 100644
--- a/front/server_test.ajax.php
+++ b/front/server_test.ajax.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * AJAX endpoint for testing UrBackup API
  */
diff --git a/install/install.php b/install/install.php
index 259e2ef..604e60d 100644
--- a/install/install.php
+++ b/install/install.php
@@ -1,19 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * -------------------------------------------------------------------------
  * UrBackup plugin for GLPI
  * -------------------------------------------------------------------------
- *
- * Install/update process for GLPI 11.
- *
- * GLPI 11 Migration class does not expose createTable()/addTable().
- * Compatible GLPI plugin pattern:
- *
- * - initial schema creation from SQL file using $DB->runFile()
- * - schema evolution using Migration addField(), addKey(), executeMigration()
- *
- * -------------------------------------------------------------------------
  */
 
 use GlpiPlugin\Urbackup\Config;
diff --git a/install/uninstall.php b/install/uninstall.php
index 454285e..29ca564 100644
--- a/install/uninstall.php
+++ b/install/uninstall.php
@@ -1,12 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * -------------------------------------------------------------------------
  * UrBackup plugin for GLPI
  * -------------------------------------------------------------------------
- *
- * Uninstall process for GLPI 11.
- * -------------------------------------------------------------------------
  */
 
 use GlpiPlugin\Urbackup\Profile;
diff --git a/setup.php b/setup.php
index 1f97100..3ff97e7 100644
--- a/setup.php
+++ b/setup.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 // Force OPcache to reload this file when accessed via web
 if (PHP_SAPI !== 'cli' && function_exists('opcache_invalidate')) {
     opcache_invalidate(__FILE__, true);
diff --git a/src/AssetTab.php b/src/AssetTab.php
index 85734bd..37fd1b2 100644
--- a/src/AssetTab.php
+++ b/src/AssetTab.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * -------------------------------------------------------------------------
  * UrBackup plugin for GLPI
diff --git a/src/MassiveAction.php b/src/MassiveAction.php
index 13a1fd4..2e3f7a0 100644
--- a/src/MassiveAction.php
+++ b/src/MassiveAction.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * -------------------------------------------------------------------------
  * UrBackup plugin for GLPI
diff --git a/src/Server.php b/src/Server.php
index f6c2bac..accab3d 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * -------------------------------------------------------------------------
  * UrBackup plugin for GLPI
@@ -327,7 +329,7 @@ class Server extends CommonDBTM
 
         $this->initForm($ID, $options);
         $this->showFormHeader($options);
-        $this->showFormFields($ID);
+        $this->showFormFields($ID > 0 ? (int) $ID : null);
         $this->showFormButtons($options);
 
         return true;
@@ -1339,7 +1341,7 @@ JAVASCRIPT;
         return $cache[$id];
     }
 
-    private static function getAssetIp(string $itemtype, int $items_id): string
+    public static function getAssetIp(string $itemtype, int $items_id): string
     {
         global $DB;
 
diff --git a/src/ServerAsset.php b/src/ServerAsset.php
index 56eb4d8..de697f7 100644
--- a/src/ServerAsset.php
+++ b/src/ServerAsset.php
@@ -79,7 +79,6 @@ class ServerAsset extends CommonDBTM
         }
 
         $table = self::getTable();
-        $date = $_SESSION['glpi_currenttime'] ?? date('Y-m-d H:i:s');
 
         $existing = self::getLinkForAsset($itemtype, $items_id, false);
 
@@ -88,10 +87,6 @@ class ServerAsset extends CommonDBTM
                 $table,
                 [
                     'plugin_urbackup_servers_id' => $server_id,
-                    'client_name'                => (string) ($item->fields['name'] ?? ''),
-                    'client_ip'                  => self::extractAssetIp($item),
-                    'is_active'                  => 1,
-                    'date_mod'                   => $date,
                 ],
                 [
                     'id' => (int) $existing['id'],
@@ -243,43 +238,40 @@ class ServerAsset extends CommonDBTM
 
         echo "<div class='center'>";
         echo "<table class='tab_cadre_fixehov'>";
-        echo "<tr><th colspan='5'>" . htmlspecialchars(__('Linked assets', 'urbackup')) . "</th></tr>";
+        echo "<tr><th colspan='4'>" . htmlspecialchars(__('Linked assets', 'urbackup')) . "</th></tr>";
         echo "<tr>";
         echo "<th>" . htmlspecialchars(__('Asset', 'urbackup')) . "</th>";
         echo "<th>" . htmlspecialchars(__('Type')) . "</th>";
         echo "<th>" . htmlspecialchars(__('IP address', 'urbackup')) . "</th>";
-        echo "<th>" . htmlspecialchars(__('Last file backup', 'urbackup')) . "</th>";
-        echo "<th>" . htmlspecialchars(__('Last image backup', 'urbackup')) . "</th>";
         echo "</tr>";
 
         $iterator = $DB->request([
             'FROM'  => self::getTable(),
             'WHERE' => [
                 'plugin_urbackup_servers_id' => (int) $item->fields['id'],
-                'is_active'                  => 1,
             ],
-            'ORDER' => 'client_name',
         ]);
 
         foreach ($iterator as $row) {
-            $asset_label = (string) $row['client_name'];
             $itemtype = (string) $row['itemtype'];
             $items_id = (int) $row['items_id'];
 
+            $asset_label = (string) $items_id;
+            $asset_ip = '';
+
             if (class_exists($itemtype)) {
                 $asset = new $itemtype();
 
                 if ($asset instanceof CommonDBTM && $asset->getFromDB($items_id)) {
                     $asset_label = $asset->getLink();
+                    $asset_ip = Server::getAssetIp($itemtype, $items_id);
                 }
             }
 
             echo "<tr class='tab_bg_1'>";
             echo "<td>" . $asset_label . "</td>";
             echo "<td>" . htmlspecialchars($itemtype) . "</td>";
-            echo "<td>" . htmlspecialchars((string) $row['client_ip']) . "</td>";
-            echo "<td>" . htmlspecialchars((string) $row['last_file_backup']) . "</td>";
-            echo "<td>" . htmlspecialchars((string) $row['last_image_backup']) . "</td>";
+            echo "<td>" . htmlspecialchars($asset_ip ?: '-') . "</td>";
             echo "</tr>";
         }