Fix: リモートからのアカウント削除時エラーが出る問題 (#872)

* Fix: アカウント削除時エラーが出る問題

* nilに変更

* 削除するタイミングと条件を調整

* Fix test

app/models/concerns/account/associations.rb

@@ -19,6 +19,7 @@ module Account::Associations
     has_many :conversations, class_name: 'AccountConversation', dependent: :destroy, inverse_of: :account
     has_many :scheduled_statuses, inverse_of: :account, dependent: :destroy
     has_many :scheduled_expiration_statuses, inverse_of: :account, dependent: :destroy
+    has_many :ng_rule_histories, inverse_of: :account, dependent: :destroy
 
     # Notifications
     has_many :notifications, inverse_of: :account, dependent: :destroy

app/services/delete_account_service.rb

@@ -170,6 +170,7 @@ class DeleteAccountService < BaseService
     purge_feeds!
     purge_other_associations!
 
+    remove_ng_rule_history_relations! unless keep_account_record?
     @account.destroy unless keep_account_record?
   end
 
@@ -273,6 +274,10 @@ class DeleteAccountService < BaseService
     @account.save!
   end
 
+  def remove_ng_rule_history_relations!
+    @account.ng_rule_histories.update_all(account_id: nil)
+  end
+
   def fulfill_deletion_request!
     @account.deletion_request&.destroy
   end