diff --git a/etcnixos/system-mreow.nix b/etcnixos/system-mreow.nix
index 42e127e..53ae6af 100644
--- a/etcnixos/system-mreow.nix
+++ b/etcnixos/system-mreow.nix
@@ -118,4 +118,10 @@
   # disable framework kernel module
   # https://github.com/NixOS/nixos-hardware/issues/1330
   hardware.framework.enableKmod = false;
+
+  # for database class
+  services.mysql = {
+    enable = true;
+    package = pkgs.mariadb;
+  };
 }