postgresql-backup: move to own services

This way the `startAt` setting is only set once.

configuration.nix

@@ -94,6 +94,10 @@
       useACME = true;
       domain = "monitoring.${config.networking.domain}";
     };
+
+    postgresql-backup = {
+      enable = true;
+    };
   };
 
   security.acme.acceptTerms = true;

services/default.nix

@@ -6,5 +6,6 @@
     ./matrix.nix
     ./miniflux.nix
     ./monitoring.nix
+    ./postgresql-backup.nix
   ];
 }

services/matrix.nix

@@ -13,6 +13,7 @@ with lib;
 
 let
   cfg = config.my.services.matrix;
+  my = config.my;
 
   federationPort = { public = 8448; private = 11338; };
   clientPort = { public = 443; private = 11339; };
@@ -28,11 +29,8 @@ in {
       package = pkgs.postgresql_12;
     };
 
-    services.postgresqlBackup = {
+    services.postgresqlBackup = mkIf my.services.postgresql-backup.enable {
-      enable = true;
       databases = [ "matrix-synapse" ];
-      # Borg backup starts at midnight so create DB dump just before
-      startAt = "*-*-* 23:30:00";
     };
 
     services.matrix-synapse = {

services/miniflux.nix

@@ -4,6 +4,7 @@ with lib;
 
 let
   cfg = config.my.services.miniflux;
+  my = config.my;
 
   domain = config.networking.domain;
 in {
@@ -28,7 +29,7 @@ in {
   config = mkIf cfg.enable {
     # services.postgresql is automatically enabled by services.miniflux, let's
     # back it up
-    services.postgresqlBackup = {
+    services.postgresqlBackup = mkIf my.services.postgresql-backup.enable {
       databases = [ "miniflux" ];
     };
 

services/postgresql-backup.nix

@@ -0,0 +1,19 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.my.services.postgresql-backup;
+in {
+  options.my.services.postgresql-backup = {
+    enable = mkEnableOption "Backup SQL databases";
+  };
+
+  config = mkIf cfg.enable {
+    services.postgresqlBackup = {
+      enable = true;
+      # Borg backup starts at midnight so create DB dump just before
+      startAt = "*-*-* 23:30:00";
+    };
+  };
+}