@startuml
'https://plantuml.com/sequence-diagram

class SubscribedUser {
- id
+ user_id
+ registered_at
+ created_at
+ modified_at
}

class SubscribedBoard {
- id
- user_id
+ board_name
+ created_at
+ modified_at
}

class PublishedHisotry {
- id
+ user_id
+ board_name_list
+ published_at
+ created_at
+ modified_at
}

class PpomppuArticle {
- id
+ article_id
+ board_name
+ article_url
+ title
+ recommended
+ hit
+ registered_at
+ created_at
+ modified_at
}

class PpomppuBoardFeedStatus {
- id
+ board_name
+ latest_parsed_article_id
+ updated_at
+ created_at
+ modified_at
}

SubscribedUser --o{ SubscribedBoard
SubscribedUser --o{ PublishedHisotry

@enduml