diff --git a/infrastructure/databases/mariadb-clusters/mariadb.yaml b/infrastructure/databases/mariadb-clusters/mariadb.yaml
index bbe6507..0a93eb2 100644
--- a/infrastructure/databases/mariadb-clusters/mariadb.yaml
+++ b/infrastructure/databases/mariadb-clusters/mariadb.yaml
@@ -9,6 +9,10 @@ spec:
     enabled: true
     # primary:
     #   automaticFailover: true
+  myCnf: |
+    [mariadb]
+    # Kimai migrations can include zero-date defaults; relax NO_ZERO_DATE / strict handling.
+    sql_mode=ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
   rootPasswordSecretKeyRef:
     name: mariadb-secrets
     key: password