waffentrager: add postgresql

configurations/host/waffentrager/services/default.nix

@@ -3,6 +3,8 @@
   imports =
     [
       ./elements.nix
+      ./postgresql.nix
     ];
   waffentragerService.elements.enable = true;
+  waffentragerService.postgresql.enable = true;
 }

configurations/host/waffentrager/services/postgresql.nix

@@ -0,0 +1,22 @@
+{ materusArg, config, lib, pkgs, ... }:
+{
+  options.waffentragerService.postgresql.enable = materusArg.pkgs.lib.mkBoolOpt false "Enable postgresql";
+
+
+  config =
+    let
+      cfg = config.waffentragerService.postgresql;
+    in
+    lib.mkIf cfg.enable {
+      waffentragerService.elements.enable = true;
+
+      services.postgresql.enable = true;
+      services.postgresql.package = pkgs.postgresql_16;
+      services.postgresql.dataDir = "${config.waffentragerService.elements.path}/services/postgresql";
+      systemd.services.postgresql = {
+        partOf = ["elements-mount.service"];
+        requires = ["elements-mount.service"];
+        after = ["elements-mount.service"];
+      };
+    };
+}