What this in wp-options table ? "_transient_timeout_amp_img_….."

Hi,

First please make a full backup to your website and database.
Please check this article: how to Manage and Delete Transients in WordPress -> https://www.wpbeginner.com/plugins/how-to-manage-and-delete-transients-in-wordpress/
If you want to delete them using a plugin or a database query https://www.screencast.com/t/v57p2mLhK840 this code will delete all transient for amp img
only the transient timeout amp img
https://pastebin.com/2AU04Mi8
and this one will remove all transients from wp_options
https://pastebin.com/h9vXh0AT

Hope this will help you to increase your website speed.
Thank you!

Hi,

The theme and plugins that you have will create new transient_ every time it needs, after those expire will be save in database as _transient_timeout_ that is way those reappear.

Thank you!