How to change all the images in post content to full/orginal size – Thumbnails are broken

If you have access to WP CLI, make a backup of your database (I like using WP-CLI db export), and then use the search-replace command to change image URLs (untested):

wp search-replace "-150x150.jpg" ".jpg" --include-columns=post_content

Remember to change and run the command for every image size and file extension.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)