alphadex/db/migrations/004_create_urls.rb

Sequel.migration do
  up do
    create_table(:urls) do
      primary_key :id
      foreign_key :entity_id, :entities, null: false, unique: true

      String :url, unique: true, null: false

      DateTime :created_at, null: false
      DateTime :modified_at, null: false
    end

    json = Sequel.sqlite_json_op(:json)
    href = json.extract("$.href")

    DB[:pinboard]
      .select_append(href.as(:href))
      .each do |pin|
        entity_id = pin.fetch(:entity_id)
        url = pin.fetch(:href)
        created_at = modified_at = DateTime.now

        DB[:urls].insert(entity_id:, url:, created_at:, modified_at:)
      end
  end

  down do
    drop_table(:urls)
  end
end