Attachments metadata table gone: how to rebuild media library? (wp_postmeta)

(I thought I posted this an hour ago but I can’t find it!)

One of the tables went missing from my database is wp_postmeta

The most useful pieces of information are _wp_attached_file and _wp_attachment_metadata

What still works:
– Thumbnails and embed images are still visible because they link directly to the files and all the images are safely stored on my server
See screenshot here
– If I use Add Media I can see a preview of all the images
See screenshot here

What doesn’t work:
– On Add Media, although previews are visible, if I click on it there’s no information as per size of the image. If I click on “Edit Image” this message comes up “Image data does not exist. Please re-upload the image.”
See screenshot here
– If I open Media -> Library -> All the images are listed as usual but the preview is missing and so the information. Images can’t be edited
See screenshot here
– I tried to rebuild thumbnails or use plugins as Fix My Posts but they don’t work.
See screenshot here

What is missing?
I reuploaded one image and these are the elements missing for all the over 65,000 images on the server.

(559366, 166644, ‘_wp_attached_file’, ‘2014/05/4660428211.jpg’),
(559368, 166644, ‘_wp_attachment_metadata’, ‘a:6:{s:5:”width”;i:594;s:6:”height”;i:396;s:4:”file”;s:22:”2014/05/4660428211.jpg”;s:5:”sizes”;a:4:{s:9:”thumbnail”;a:5:{s:4:”file”;s:22:”4660428211-150×100.jpg”;s:5:”width”;i:150;s:6:”height”;i:100;s:9:”mime-type”;s:10:”image/jpeg”;s:20:”ewww_image_optimizer”;s:51:”Reduced by 8.1% (329?B) – Previously Optimized”;}s:6:”medium”;a:5:{s:4:”file”;s:22:”4660428211-300×200.jpg”;s:5:”width”;i:300;s:6:”height”;i:200;s:9:”mime-type”;s:10:”image/jpeg”;s:20:”ewww_image_optimizer”;s:51:”Reduced by 3.7% (390?B) – Previously Optimized”;}s:34:”cat_post_thumb_sizecategoryposts-5″;a:5:{s:4:”file”;s:22:”4660428211-100×100.jpg”;s:5:”width”;i:100;s:6:”height”;i:100;s:9:”mime-type”;s:10:”image/jpeg”;s:20:”ewww_image_optimizer”;s:51:”Reduced by 9.8% (321?B) – Previously Optimized”;}s:14:”ipmb-thumbnail”;a:5:{s:4:”file”;s:20:”4660428211-75×75.jpg”;s:5:”width”;i:75;s:6:”height”;i:75;s:9:”mime-type”;s:10:”image/jpeg”;s:20:”ewww_image_optimizer”;s:52:”Reduced by 13.8% (323?B) – Previously Optimized”;}}s:10:”image_meta”;a:10:{s:8:”aperture”;i:0;s:6:”credit”;s:12:”Getty Images”;s:6:”camera”;s:0:””;s:7:”caption”;s:365:”LONDON, ENGLAND – JANUARY 31: Constance Briscoe, a barrister and part-time judge, arrives at Southwark Crown Court on January 31, 2014 in London, England. Ms Briscoe is accused of providing two inaccurate statements to police and altering a police witness statement, which were used in the trial of Chris Huhne and Vicky Pryce. (Photo by Dan Kitwood/Getty Images)”;s:17:”created_timestamp”;i:0;s:9:”copyright”;s:17:”2014 Getty Images”;s:12:”focal_length”;i:0;s:3:”iso”;i:0;s:13:”shutter_speed”;i:0;s:5:”title”;s:78:”Constance Briscoe In Court To Face Charges Of Perverting The Course Of Justice”;}s:20:”ewww_image_optimizer”;s:52:”Reduced by 4.5% (1.9?kB) – Previously Optimized”;}’);

How do I rebuild these _wp_attached_file and _wp_attachment_metadata?