Upgrade postgres

hosts/buzzrelay/default.nix

@@ -1,4 +1,4 @@
-{ config, ... }:
+{ config, pkgs, ... }:
 {
   c3d2 = {
     deployment.server = "server10";
@@ -37,7 +37,11 @@
       };
     };
 
-    postgresql.settings.log_min_duration_statement = 50;
+    postgresql = {
+      package = pkgs.postgresql_15;
+      settings.log_min_duration_statement = 50;
+      upgrade.stopServices = [ "buzzrelay" ];
+    };
   };
 
   system.stateVersion = "22.11";