diff --git a/back/src/org/kar/karusic/migration/Initialization.java b/back/src/org/kar/karusic/migration/Initialization.java
index 9b497ea..bec59ac 100644
--- a/back/src/org/kar/karusic/migration/Initialization.java
+++ b/back/src/org/kar/karusic/migration/Initialization.java
@@ -18,21 +18,18 @@ public class Initialization extends MigrationSqlStep {
 	private static final Logger LOGGER = LoggerFactory.getLogger(Initialization.class);
 
 	public static final int KARSO_INITIALISATION_ID = 1;
-	public static final List<Class<?>> CLASSES_BASE = List.of(Album.class, Artist.class, Data.class, Gender.class, Playlist.class, Track.class, User.class);
+	public static final List<Class<?>> CLASSES_BASE = List.of(Album.class, Artist.class, Data.class, Gender.class,
+			Playlist.class, Track.class, User.class);
 
 	@Override
 	public String getName() {
 		return "Initialization";
 	}
 
-	public Initialization() {
-
-	}
-
 	@Override
 	public void generateStep() throws Exception {
-		for (final Class<?> elem : CLASSES_BASE) {
-			addClass(elem);
+		for (final Class<?> clazz : CLASSES_BASE) {
+			addClass(clazz);
 		}
 
 		addAction((final DBAccess da) -> {
@@ -63,6 +60,7 @@ public class Initialization extends MigrationSqlStep {
 					new Gender(24L, "Bande Originale"), //
 					new Gender(25L, "Variété Belge"), //
 					new Gender(26L, "Gospel"));
+			da.insertMultiple(data);
 		});
 		// set start increment element to permit to add after default elements
 		addAction("""