fixes for failed cron maintenance tasks

* update rails scripts for 5.2
* system dmails should be scoped to system
* fix broken url generator in forum notices

config/boot.rb

@@ -1,14 +1,4 @@
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
 
 require 'bundler/setup' # Set up gems listed in the Gemfile.
-require 'bootsnap'
-require 'tmpdir'
-Bootsnap.setup(
-  cache_dir: File.join(Dir.tmpdir, 'bootsnap-cache'), # Path to your cache
-  development_mode: ENV['MY_ENV'] == 'development',
-  load_path_cache: true, # Should we optimize the LOAD_PATH with a cache?
-  autoload_paths_cache: true, # Should we optimize ActiveSupport autoloads with cache?
-  disable_trace: false, # Sets `RubyVM::InstructionSequence.compile_option = { trace_instruction: false }`
-  compile_cache_iseq: true, # Should compile Ruby code into ISeq cache?
-  compile_cache_yaml: true # Should compile YAML into a cache?
-)
+require 'bootsnap/setup' # Speed up boot time by caching expensive operations.