system: drop postgres

These days I'm no longer interested in the time commitment required for
maintaining postgres for fun.

modules/system.nix

@@ -25,7 +25,6 @@ let
     mullvad
     allowSRB2Port
     allowDevPort
-    postgres
     ;
 
   isPhone = config.programs.calls.enable;
@@ -78,7 +77,6 @@ in
 
     iHaveLotsOfRam = mkEnableOption "tmpfs on /tmp";
     mullvad = mkEnableOption "mullvad vpn";
-    postgres = mkEnableOption "postgres database for containers";
     allowSRB2Port = mkEnableOption "port for srb2";
     allowDevPort = mkEnableOption "port for development server";
   };
@@ -256,18 +254,6 @@ in
         enableExcludeWrapper = false;
       };
 
-      postgresql = mkIf postgres {
-        enable = true;
-
-        ensureUsers = singleton {
-          name = username;
-        };
-
-        ensureDatabases = [
-          username
-        ];
-      };
-
       openssh = {
         enable = true;