[wp-hackers] Why WP mantain old post slug?

[Andrew Ozz]

Stefano Aglietti wrote:
> A user asked me why even after chamging a post slufg the old one vas
> still searchable and the old url still active redirectong to new post.
> 
> Checking i noticed that old post slug is saved on wp_postmeta table
> using wp_old_slug" as key for the meta_key column. Why these data is
> mantained? For what aim?
> 
> Toi avoid having old slug still "active" the only solution was to
> deleta the row idirectly in the database.

Delete the old slug after about 6 months, right? Otherwise very bad for 
SEO/external links. Even better not to touch it though.