# SEO Date Handling Changes

## Migration

* rename publish_start_date -> first_published_at
* subtract 3 days from expired_at and rename to last_processed_at

## SEO Feed Generator

* don't calculate published_at (calculatedDatePosted in lensa-site) as it needs the "today" of request time for calculation
* save first_published_at instead to Dynamo

## SEO API

### First step

@startuml
if (last_processed_at present) then (yes)
  :valid_through = last_processed_at + 3 days;
else (no)
  if (first_published_at present) then (yes)
    :valid_through = first_published_at + 30 days;
  else (no)
    :valid_through = 2018-05-02;
  endif
endif
@enduml

### Second step

@startuml
if (first_published_at and valid_through present) then (yes)
  :calculate published_at from min(today, valid_through);
else (no)
  :published_at = None;
endif
@enduml

### Third step

@startuml
if (job is expired) then (yes)
    if (valid_through present and is a valid date and is less then now) then (yes)
        :valid_through unchanged;
    else (no)
      :valid_through = None;
    endif
else (no)
  if (published_at present and is a valid date) then (yes)
        :valid_through = published_at + 30 days;
    else (no)
      :valid_through = None;
    endif
endif
@enduml