diff --git a/argocd/apps/mattermost/mattermnost.yaml b/argocd/apps/mattermost/mattermnost.yaml
index 2aa50fe..4b8bce3 100644
--- a/argocd/apps/mattermost/mattermnost.yaml
+++ b/argocd/apps/mattermost/mattermnost.yaml
@@ -39,6 +39,13 @@ spec:
             accessMode: ReadWriteOnce
             size: 10Gi
 
+        # WICHTIG: Explizite Datenbank-Konfiguration für Mattermost
+        extraEnvVars:
+          - name: MM_SQLSETTINGS_DRIVERNAME
+            value: "mysql"
+          - name: MM_SQLSETTINGS_DATASOURCE
+            value: "mmdbuser:mmdbpwd@tcp(mattermost-mysql:3306)/mattermost?charset=utf8mb4,utf8&readTimeout=30s&writeTimeout=30s"
+
         # Ingress Konfiguration
         ingress:
           enabled: true