@startuml

actor user
participant news_aggregator_back
database db
participant source_1
participant source_2

activate user

user -> news_aggregator_back ++  : /general
  news_aggregator_back -> db ++ : GET
  return response

  group db records is outdated
    news_aggregator_back -> source_1 ++ : GET
    return response
    news_aggregator_back -> db ++ : POST
    return response

    news_aggregator_back -> source_2 ++ : GET
    return response
    news_aggregator_back -> db ++ : POST
    return response
  end

return response

@enduml

'request
'
'for sources as source
'  check db
'  if !updated
'    update source
'
'show