With the new update to 4.2.0 (thank you osclasspoint) whe have now possibility to clean up data.

I have 18k expired ads and if I delete all these ads it won't be a seo problem?
A lot of expired ads are indexed by google.


What you do with expired ads?


Thank you

Basically once ad is expired, you should add noindex nofollow to head so google slowly unindex page and then can be removed.
Seo impact is hard to say, it is not relevant content anymore and waste your resources, but may add unique content.
But for example in my country once you have sold what you adverise, you remove ad immediatelly so people do not contact you anymore.

@mbthemes
where to do in this.
add noindex nofollow to head

In head.php as condition for item page if listing is expired.