surely this will work

lib/hosts.nix

@@ -17,6 +17,7 @@
         specialArgs = { 
           inherit inputs;
           inherit lib;
+          username = user;
         };
       };
     }) (lib.getDirsInDir ../hosts));

modules/nixos/core/systemd.nix

@@ -0,0 +1,8 @@
+{ ... }:
+
+{
+  /* https://files.catbox.moe/s5diss.mp4 */
+  systemd.extraConfig = ''
+    DefaultTimeoutStopSpec=5s
+  '';
+}

modules/nixos/desktop/gnome/default.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ pkgs, username, ... }:
 
 {
   services.xserver = {
@@ -40,4 +40,12 @@
     just-perfection
     quick-settings-tweaker
   ]);
+
+  environment.persistence."/nix/persist" = {
+    users."${username}" = {
+      directories = [
+        ".config/dconf"
+      ];
+    };
+  };
 }