Start from scratch

modules/base/system/default.nix

@@ -0,0 +1,25 @@
+{
+  flake.modules =
+    let
+      stateVersion = "25.05";
+    in
+    {
+      homeManager.base = {
+        home = {
+          inherit stateVersion;
+        };
+      };
+
+      nixos.base = {
+        system = {
+          # This value determines the NixOS release from which the default
+          # settings for stateful data, like file locations and database versions
+          # on your system were taken. It‘s perfectly fine and recommended to leave
+          # this value at the release version of the first install of this system.
+          # Before changing this value read the documentation for this option
+          # (e.g. man configuration.nix or on https://search.nixos.org/options?&show=system.stateVersion&from=0&size=50&sort=relevance&type=packages&query=stateVersion).
+          inherit stateVersion;
+        };
+      };
+    };
+}