diff --git a/Config/module.xml b/Config/module.xml
index cc24390..6b4e697 100644
--- a/Config/module.xml
+++ b/Config/module.xml
@@ -20,7 +20,7 @@
         <language>en_US</language>
         <language>fr_FR</language>
     </languages>
-    <version>3.0.2</version>
+    <version>3.0.3</version>
     <authors>
         <author>
             <name>Vincent Lopes-Vicente</name>
diff --git a/ShortCode.php b/ShortCode.php
index 2709323..ff97986 100644
--- a/ShortCode.php
+++ b/ShortCode.php
@@ -13,6 +13,7 @@
 namespace ShortCode;
 
 use Propel\Runtime\Connection\ConnectionInterface;
+use Propel\Runtime\Propel;
 use Propel\Runtime\Exception\PropelException;
 use ShortCode\Model\ShortCodeQuery;
 use Thelia\Core\Install\Database;
@@ -23,14 +24,20 @@ class ShortCode extends BaseModule
     /** @var string */
     const DOMAIN_NAME = 'shortcode';
 
+    /**
+     * Create the tables on a fresh install.
+     *
+     * The install script starts with DROP TABLE, so it only runs when the tables are missing.
+     * The database is asked rather than an "is_initialized" flag in the module configuration:
+     * a shop whose tables were created another way, or whose configuration was lost, would
+     * otherwise have every short code wiped by a mere reactivation.
+     */
     public function preActivation(?ConnectionInterface $con = null): bool
     {
-        if (!$this->getConfigValue('is_initialized', false)) {
-            $database = new Database($con);
+        $con ??= Propel::getWriteConnection('TheliaMain');
 
-            $database->insertSql(null, array(__DIR__ . '/Config/TheliaMain.sql'));
-
-            $this->setConfigValue('is_initialized', true);
+        if (!$this->hasTable($con, 'short_code')) {
+            (new Database($con))->insertSql(null, [__DIR__.'/Config/TheliaMain.sql']);
         }
 
         return true;
@@ -86,4 +93,12 @@ public static function deactivateShortCode($shortCodeName)
                 ->save();
         }
     }
+
+    private function hasTable(ConnectionInterface $con, string $table): bool
+    {
+        $statement = $con->prepare('SELECT COUNT(*) FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = :table');
+        $statement->execute(['table' => $table]);
+
+        return (int) $statement->fetchColumn() > 0;
+    }
 }
diff --git a/Tests/Integration/ActivationTest.php b/Tests/Integration/ActivationTest.php
new file mode 100644
index 0000000..0de337b
--- /dev/null
+++ b/Tests/Integration/ActivationTest.php
@@ -0,0 +1,127 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the Thelia package.
+ * http://www.thelia.net
+ *
+ * (c) OpenStudio <info@thelia.net>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace ShortCode\Tests\Integration;
+
+use ShortCode\ShortCode;
+use PHPUnit\Framework\Attributes\Test;
+use Propel\Runtime\Connection\ConnectionInterface;
+use Propel\Runtime\Propel;
+use Thelia\Core\Install\Database;
+use Thelia\Model\ModuleConfigQuery;
+use Thelia\Model\ModuleQuery;
+use Thelia\Test\IntegrationTestCase;
+
+/**
+ * Activating the module creates its tables on a fresh install, and never touches the
+ * short codes of a shop that already has them.
+ *
+ * The install script starts with DROP TABLE, which commits implicitly: no test transaction,
+ * the tables are restored and the test row removed by hand.
+ */
+final class ActivationTest extends IntegrationTestCase
+{
+    private const INSTALL_SCRIPT = __DIR__.'/../../Config/TheliaMain.sql';
+
+    protected bool $useTransaction = false;
+
+    private ConnectionInterface $con;
+
+    private ?int $rowId = null;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->con = Propel::getWriteConnection('TheliaMain');
+    }
+
+    protected function tearDown(): void
+    {
+        if (!$this->hasTable('short_code')) {
+            (new Database($this->con))->insertSql(null, [self::INSTALL_SCRIPT]);
+        }
+
+        if (null !== $this->rowId) {
+            $this->con->prepare('DELETE FROM `short_code` WHERE `id` = :id')->execute(['id' => $this->rowId]);
+        }
+
+        parent::tearDown();
+    }
+
+    #[Test]
+    public function reactivatingTheModuleKeepsTheExistingRowsEvenWithoutItsInstallFlag(): void
+    {
+        $this->con->exec("INSERT INTO `short_code` (`tag`, `event`, `active`) VALUES ('activation_test', 'activation_test', 1)");
+        $this->rowId = (int) $this->con->lastInsertId();
+
+        // A shop whose tables were created without going through the activation: by a schema
+        // command, or with its module configuration lost.
+        $this->forgetInstallFlag();
+
+        $this->activate();
+
+        self::assertSame(1, (int) $this->con->query('SELECT COUNT(*) FROM `short_code` WHERE `id` = '.$this->rowId)->fetchColumn());
+    }
+
+    #[Test]
+    public function activatingTheModuleOnAFreshInstallCreatesItsTables(): void
+    {
+        $tables = $this->installScriptTables();
+
+        $this->forgetInstallFlag();
+        $this->con->exec('SET FOREIGN_KEY_CHECKS = 0');
+        foreach ($tables as $table) {
+            $this->con->exec('DROP TABLE IF EXISTS `'.$table.'`');
+        }
+        $this->con->exec('SET FOREIGN_KEY_CHECKS = 1');
+
+        $this->activate();
+
+        foreach ($tables as $table) {
+            self::assertTrue($this->hasTable($table), $table.' is created.');
+        }
+    }
+
+    private function activate(): void
+    {
+        $module = new ShortCode();
+        self::assertTrue($module->preActivation($this->con));
+        $module->postActivation($this->con);
+    }
+
+    private function forgetInstallFlag(): void
+    {
+        $moduleId = (int) ModuleQuery::create()->findOneByCode('ShortCode')?->getId();
+        ModuleConfigQuery::create()->filterByModuleId($moduleId)->filterByName('is_initialized')->delete();
+    }
+
+    /**
+     * @return list<string>
+     */
+    private function installScriptTables(): array
+    {
+        preg_match_all('/^CREATE TABLE `(\w+)`/m', (string) file_get_contents(self::INSTALL_SCRIPT), $matches);
+
+        return $matches[1];
+    }
+
+    private function hasTable(string $table): bool
+    {
+        $statement = $this->con->prepare('SELECT COUNT(*) FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = :table');
+        $statement->execute(['table' => $table]);
+
+        return (int) $statement->fetchColumn() > 0;
+    }
+}