diff --git a/DependencyInjection/KimaiHeatmapExtension.php b/DependencyInjection/KimaiHeatmapExtension.php
new file mode 100644
index 0000000..f68dedf
--- /dev/null
+++ b/DependencyInjection/KimaiHeatmapExtension.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace KimaiPlugin\KimaiHeatmapBundle\DependencyInjection;
+
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+use Symfony\Component\HttpKernel\DependencyInjection\Extension;
+
+class KimaiHeatmapExtension extends Extension
+{
+    public function load(array $configs, ContainerBuilder $container): void
+    {
+        $loader = new YamlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
+        $loader->load('services.yaml');
+    }
+}
diff --git a/Resources/config/services.yaml b/Resources/config/services.yaml
new file mode 100644
index 0000000..123293a
--- /dev/null
+++ b/Resources/config/services.yaml
@@ -0,0 +1,3 @@
+services:
+    KimaiPlugin\KimaiHeatmapBundle\KimaiHeatmapBundle:
+        tags: ['App\Plugin\PluginInterface']
diff --git a/dev/setup.sh b/dev/setup.sh
index 85a3cf5..847369e 100755
--- a/dev/setup.sh
+++ b/dev/setup.sh
@@ -61,7 +61,22 @@ echo "==> Symlinking plugin..."
 mkdir -p var/plugins
 ln -sfn "$PROJECT_DIR" var/plugins/KimaiHeatmapBundle
 
-# Step 9: Clear cache
+# Step 9: Exclude recursive symlink from autoloader classmap
+# The plugin symlink points to project root which contains dev/kimai/ creating a loop.
+# Tell Composer to skip scanning the dev/ directory inside the plugin symlink.
+cd "$KIMAI_DIR"
+php -r '
+$f = "composer.json";
+$j = json_decode(file_get_contents($f), true);
+$exclude = "var/plugins/KimaiHeatmapBundle/dev/";
+if (!in_array($exclude, $j["autoload"]["exclude-from-classmap"] ?? [])) {
+    $j["autoload"]["exclude-from-classmap"][] = $exclude;
+    file_put_contents($f, json_encode($j, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES) . "\n");
+}
+'
+composer dump-autoload
+
+# Step 10: Clear cache
 bin/console cache:clear
 
 # Stop MariaDB
diff --git a/flake.nix b/flake.nix
index 915666d..2dda84b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,7 +11,7 @@
       pkgs = nixpkgs.legacyPackages.${system};
       php = pkgs.php82.buildEnv {
         extensions = { enabled, all }: enabled ++ (with all; [ xsl pdo_mysql ]);
-        extraConfig = "memory_limit = 512M";
+        extraConfig = "memory_limit = 1G";
       };
     in
     {