Multi-Currency Part 2 (#543)

* Support all currencies, handle outside DB

* Remove currencies from seed

* Fix account balance namespace

* Set default currency on authentication

* Cache currency instances

* Implement multi-currency syncs with tests

* Series fallback, passing tests

* Fix conflicts

* Make value group concrete class that works with currency values

* Fix migration conflict

* Update tests to expect multi-currency results

* Update account list to use group method

* Namespace updates

* Fetch unknown exchange rates from API

* Fix date range bug

* Ensure demo data works without external API

* Enforce cascades only at DB level

db/migrate/20240308121431_remove_currency_table.rb

@@ -0,0 +1,5 @@
+class RemoveCurrencyTable < ActiveRecord::Migration[7.2]
+  def change
+    drop_table :currencies
+  end
+end

db/migrate/20240313141813_update_unique_indexes_for_account_balance_and_exchange_rate.rb

@@ -0,0 +1,7 @@
+class UpdateUniqueIndexesForAccountBalanceAndExchangeRate < ActiveRecord::Migration[7.2]
+  def change
+    rename_index :exchange_rates, 'idx_on_base_currency_converted_currency_date_255be792be', 'index_exchange_rates_on_base_converted_date_unique'
+    remove_index :account_balances, name: "index_account_balances_on_account_id_and_date"
+    add_index :account_balances, [ :account_id, :date, :currency ], unique: true, name: "index_account_balances_on_account_id_date_currency_unique"
+  end
+end

db/migrate/20240313203622_remove_converted_balance_from_account.rb

@@ -0,0 +1,6 @@
+class RemoveConvertedBalanceFromAccount < ActiveRecord::Migration[7.2]
+  def change
+    remove_column :accounts, :converted_balance, :decimal
+    remove_column :accounts, :converted_currency, :string
+  end
+end

db/schema.rb

@@ -26,7 +26,7 @@ ActiveRecord::Schema[7.2].define(version: 2024_03_19_154732) do
     t.string "currency", default: "USD", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.index ["account_id", "date"], name: "index_account_balances_on_account_id_and_date", unique: true
+    t.index ["account_id", "date", "currency"], name: "index_account_balances_on_account_id_date_currency_unique", unique: true
     t.index ["account_id"], name: "index_account_balances_on_account_id"
   end
 
@@ -85,8 +85,6 @@ ActiveRecord::Schema[7.2].define(version: 2024_03_19_154732) do
     t.uuid "accountable_id"
     t.decimal "balance", precision: 19, scale: 4, default: "0.0"
     t.string "currency", default: "USD"
-    t.decimal "converted_balance", precision: 19, scale: 4, default: "0.0"
-    t.string "converted_currency", default: "USD"
     t.virtual "classification", type: :string, as: "\nCASE\n    WHEN ((accountable_type)::text = ANY ((ARRAY['Account::Loan'::character varying, 'Account::Credit'::character varying, 'Account::OtherLiability'::character varying])::text[])) THEN 'liability'::text\n    ELSE 'asset'::text\nEND", stored: true
     t.boolean "is_active", default: true, null: false
     t.enum "status", default: "ok", null: false, enum_type: "account_status"
@@ -96,14 +94,6 @@ ActiveRecord::Schema[7.2].define(version: 2024_03_19_154732) do
     t.index ["family_id"], name: "index_accounts_on_family_id"
   end
 
-  create_table "currencies", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
-    t.string "name"
-    t.string "iso_code"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["iso_code"], name: "index_currencies_on_iso_code", unique: true
-  end
-
   create_table "exchange_rates", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.string "base_currency", null: false
     t.string "converted_currency", null: false
@@ -111,7 +101,7 @@ ActiveRecord::Schema[7.2].define(version: 2024_03_19_154732) do
     t.date "date"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.index ["base_currency", "converted_currency", "date"], name: "idx_on_base_currency_converted_currency_date_255be792be", unique: true
+    t.index ["base_currency", "converted_currency", "date"], name: "index_exchange_rates_on_base_converted_date_unique", unique: true
     t.index ["base_currency"], name: "index_exchange_rates_on_base_currency"
     t.index ["converted_currency"], name: "index_exchange_rates_on_converted_currency"
   end

db/seeds.rb

@@ -2,7 +2,4 @@
 # development, test). The code here should be idempotent so that it can be executed at any point in every environment.
 # The data can then be loaded with the bin/rails db:seed command (or created alongside the database with db:setup).
 
-# Create default currency
-Currency.find_or_create_by(iso_code: "USD", name: "United States Dollar")
-
 puts 'Run the following command to create demo data: `rake demo_data:reset`' if Rails.env.development?