add postgres

modules/server/kaepora/default.nix

@@ -0,0 +1,26 @@
+{ pkgs, lib, ... }:
+
+{
+  services.postgresql = {
+    enable = true;
+    package = lib.mkDefault pkgs.postgresql_18;
+
+    authentication = pkgs.lib.mkOverride 10 ''
+      #type database  DBuser  IP address     auth-method
+      local all       all                    trust
+      host  all       all     127.0.0.1/32   md5
+    '';
+
+    ensureDatabases = [
+      "giovanni"
+    ];
+
+    ensureUsers = [
+      {
+        name = "giovanni";
+        ensureDBOwnership = true;
+      }
+    ];
+  };
+}
+