Align project files with CodeHarbor

Since both projects are developed together and by the same team, we also want to have the same code structure and utility methods available in both projects. Therefore, this commit changes many files, but without a functional change.

db/seeds.rb

@@ -1,5 +1,13 @@
 # frozen_string_literal: true
 
+# Meta seed file that required depending on the Rails env different files from
+# db/seeds/ Please put the seed in the best matching file
+#
+#   * all: Objects are needed in every environment (production, development)
+#   * production: Objects are only needed for deployment
+#   * development: Only needed for local development
+#
+
 def find_factories_by_class(klass)
   FactoryBot.factories.select do |factory|
     factory.instance_variable_get(:@class_name).to_s == klass.to_s || factory.instance_variable_get(:@name) == klass.model_name.singular.to_sym
@@ -22,12 +30,15 @@ end
 Rails.application.eager_load!
 (ApplicationRecord.descendants - [ActiveRecord::SchemaMigration, User]).each(&:delete_all)
 
-# Set the default intervalstyle to iso_8601
-dbname = ApplicationRecord.connection.current_database
-ApplicationRecord.connection.exec_query("ALTER DATABASE \"#{dbname}\" SET intervalstyle = 'iso_8601';")
-
 # delete file uploads
 FileUtils.rm_rf(Rails.public_path.join('uploads'))
 
-# load environment-dependent seeds
-load(Rails.root.join("db/seeds/#{Rails.env}.rb"))
+['all', Rails.env].each do |seed|
+  seed_file = Rails.root.join("db/seeds/#{seed}.rb")
+  if seed_file.exist?
+    puts "*** Loading \"#{seed}\" seed data" # rubocop:disable Rails/Output
+    load seed_file
+  else
+    puts "*** Skipping \"#{seed}\" seed data: \"#{seed_file}\" not found" # rubocop:disable Rails/Output
+  end
+end