     for _i <- 1..10 do
       episode_candidates =
         from(e in Episode,
-          where: is_nil(e.thumbnailed) and not is_nil(e.image_url),
+          where: not e.thumbnailed and not is_nil(e.image_url),
           limit: 1_000,
           select: e.id
         )

  def catch_up_thumbnailed(conn, _paar) do
    podcast_candidates =
      from(e in Podcast,
        where: is_nil(e.thumbnailed) and not is_nil(e.image_url),
        limit: 1_000,
        select: e.id
      )


    persona_candidates =
      from(e in Persona,
        where: not e.thumbnailed and not is_nil(e.image_url),
        limit: 1_000,
        select: e.id
      )
