history_attach_timestamp($node_id) #lazy_builder callback; attaches the last read timestamp for a node.

history_node_view_alter(array &$build, EntityInterface $node, EntityViewDisplayInterface $display) Implements

history_write($nid, $account = NULL) Updates 'last viewed' timestamp of the specified entity for the current

Records which users have read which content. @todo Generic helper for _forum_user_last_visit() +

history_user_cancel($edit, $account, $method) Implements