Realistic demo data for performance testing (#2361)

* Realistic demo data for performance testing

* Add note about performance testing

* Fix bugbot issues

* More realistic account values

lib/tasks/demo_data.rake

@@ -1,28 +1,39 @@
 namespace :demo_data do
-  desc "Creates or resets demo data used in development environment"
+  desc "Creates a new user with no data. Use for testing empty data states."
   task empty: :environment do
     families = [ "Demo Family 1" ]
     Demo::Generator.new.reset_and_clear_data!(families)
   end
 
+  desc "Creates a new user who has to go through onboarding still. Use for testing onboarding flows."
   task new_user: :environment do
     families = [ "Demo Family 1" ]
     Demo::Generator.new.reset_and_clear_data!(families, require_onboarding: true)
   end
 
+  desc "General data reset that loads semi-realistic data"
   task :reset, [ :count ] => :environment do |t, args|
     count = (args[:count] || 1).to_i
     families = count.times.map { |i| "Demo Family #{i + 1}" }
     Demo::Generator.new.reset_data!(families)
   end
 
+  desc "Use this when you need to test multi-currency features of the app with a minimal setup"
   task multi_currency: :environment do
     families = [ "Demo Family 1", "Demo Family 2" ]
     Demo::Generator.new.generate_multi_currency_data!(families)
   end
 
+  desc "Use this when you want realistic budget data"
   task basic_budget: :environment do
     families = [ "Demo Family 1" ]
     Demo::Generator.new.generate_basic_budget_data!(families)
   end
+
+  # DO NOT RUN THIS unless you're testing performance locally. It will take a long time to load/clear. Easiest to clear with a db:reset
+  desc "Generates realistic data for 500 families for performance testing. Creates 1 family with Ruby, then efficiently duplicates it 499 times using SQL bulk operations."
+  task performance_testing: :environment do
+    families = [ "Performance Family 1" ]
+    Demo::Generator.new.generate_performance_testing_data!(families)
+  end
 end