starlight: add postgres again

system/starlight/default.nix

@@ -11,6 +11,7 @@
     ./boot-config.nix
     ./hardware-configuration.nix
     ./scripts.nix
+    ./postgres.nix
     ../../sets/builder.nix
     ../../sets/disc.nix
     ../../sets/fpga.nix

system/starlight/postgres.nix

@@ -0,0 +1,18 @@
+{ config, pkgs, ... }:
+
+{
+  services.postgresql = {
+    enable = true;
+    package = pkgs.postgresql_16;
+    enableJIT = true;
+
+    extraPlugins = with config.services.postgresql.package.pkgs; [ postgis ];
+
+    ensureUsers = [
+      {
+        name = "artemis";
+        ensureClauses.superuser = true;
+      }
+    ];
+  };
+}