Remove unused database_id method

Author: Knerio

app/graphql/types/flow_setting_type.rb

@@ -10,10 +10,6 @@ class FlowSettingType < Types::BaseObject
 
     field :value, GraphQL::Types::JSON, null: false, method: :object, description: 'The value of the flow setting'
 
-    def database_id
-      object.id.to_global_id.to_s
-    end
-
     id_field FlowSetting
     timestamps
   end