remove currency model and all references

app/graphql/types/balance_type.rb

@@ -8,10 +8,5 @@ module Types
 
     field :id, ID, null: false
     field :amount, String, null: false
-
-    field :currency, CurrencyType, null: false
-    def currency
-      dataloader.with(Dataloader::Source, Currency).load(object.currency_id)
-    end
   end
 end

app/graphql/types/buy_crypto_order_type.rb

@@ -7,12 +7,6 @@ module Types
     graphql_name "BuyCryptoOrder"
 
     field :id, ID, null: false
-
-    field :currency, CurrencyType, null: false
-    def currency
-      dataloader.with(Dataloader::Source, Currency).load(object.currency_id)
-    end
-
     field :status, ProcessStatusEnum, null: false
     field :paid_amount_cents, Integer, null: false
     field :received_amount, String, null: true

app/graphql/types/currency_type.rb

@@ -1,12 +0,0 @@
-# frozen_string_literal: true
-module Types
-  class CurrencyType < Types::BaseObject
-    implements GraphQL::Types::Relay::Node
-    global_id_field :id
-
-    graphql_name "Currency"
-
-    field :id, ID, null: false
-    field :name, String, null: false
-  end
-end

app/graphql/types/query_type.rb

@@ -10,16 +10,6 @@ module Types
       context[:current_user]
     end
 
-    field :balances, BalanceType.connection_type, null: false
-    def balances
-      Pundit.policy_scope(current_user, Balance)
-    end
-
-    field :fiat_balances, FiatBalanceType.connection_type, null: false
-    def fiat_balances
-      Pundit.policy_scope(current_user, FiatBalance)
-    end
-
     field :sell_crypto_orders, SellCryptoOrderType.connection_type, null: false
     def sell_crypto_orders
       Pundit.policy_scope(current_user, SellCryptoOrder)

app/graphql/types/sell_crypto_order_type.rb

@@ -7,12 +7,6 @@ module Types
     graphql_name "SellCryptoOrder"
 
     field :id, ID, null: false
-
-    field :currency, CurrencyType, null: false
-    def currency
-      dataloader.with(Dataloader::Source, Currency).load(object.currency_id)
-    end
-
     field :status, ProcessStatusEnum, null: false
     field :paid_amount, String, null: false
     field :received_amount_cents, Integer, null: true

app/graphql/types/user_type.rb

@@ -11,5 +11,8 @@ module Types
     field :first_name, String, null: false
     field :last_name, String, null: false
     field :wallet_address, String, null: true
+
+    field :balance, BalanceType, null: false
+    field :fiat_balance, FiatBalanceType, null: false
   end
 end