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

app/models/demo/data_helper.rb

@@ -0,0 +1,85 @@
+module Demo::DataHelper
+  COLORS = %w[#e99537 #4da568 #6471eb #db5a54 #df4e92 #c44fe9 #eb5429 #61c9ea #805dee #6ad28a].freeze
+
+  PERFORMANCE_TRANSACTION_COUNTS = {
+    depository_sample: 75,
+    credit_card_sample: 75,
+    investment_trades: 35,
+    investment_transactions: 35,
+    other_account_sample: 20
+  }.freeze
+
+  module_function
+
+  def random_date_within_days(max_days_ago)
+    Faker::Number.between(from: 0, to: max_days_ago).days.ago.to_date
+  end
+
+  def random_amount(min, max)
+    Faker::Number.between(from: min, to: max)
+  end
+
+  def random_positive_amount(min, max)
+    Faker::Number.positive(from: min, to: max)
+  end
+
+  def group_accounts_by_type(family)
+    accounts = family.accounts.includes(:accountable)
+
+    {
+      checking: filter_checking_accounts(accounts),
+      savings: filter_savings_accounts(accounts),
+      credit_cards: filter_credit_card_accounts(accounts),
+      investments: filter_investment_accounts(accounts),
+      loans: filter_loan_accounts(accounts),
+      properties: filter_property_accounts(accounts),
+      vehicles: filter_vehicle_accounts(accounts),
+      other_assets: filter_other_asset_accounts(accounts),
+      other_liabilities: filter_other_liability_accounts(accounts)
+    }
+  end
+
+  def filter_checking_accounts(accounts)
+    accounts.select { |a| a.accountable_type == "Depository" && (a.subtype != "savings" || a.name.include?("Checking")) }
+  end
+
+  def filter_savings_accounts(accounts)
+    accounts.select { |a| a.accountable_type == "Depository" && (a.subtype == "savings" || a.name.include?("Savings")) }
+  end
+
+  def filter_credit_card_accounts(accounts)
+    accounts.select { |a| a.accountable_type == "CreditCard" }
+  end
+
+  def filter_investment_accounts(accounts)
+    accounts.select { |a| a.accountable_type == "Investment" }
+  end
+
+  def filter_loan_accounts(accounts)
+    accounts.select { |a| a.accountable_type == "Loan" }
+  end
+
+  def filter_property_accounts(accounts)
+    accounts.select { |a| a.accountable_type == "Property" }
+  end
+
+  def filter_vehicle_accounts(accounts)
+    accounts.select { |a| a.accountable_type == "Vehicle" }
+  end
+
+  def filter_other_asset_accounts(accounts)
+    accounts.select { |a| a.accountable_type == "OtherAsset" }
+  end
+
+  def filter_other_liability_accounts(accounts)
+    accounts.select { |a| a.accountable_type == "OtherLiability" }
+  end
+
+  def random_color
+    COLORS.sample
+  end
+
+  def account_name(base_name, index, count = 1)
+    count == 1 ? base_name : "#{base_name} #{index + 1}"
+  end
+end