Restoring the backup appeared to help restart MySQL, which appears to have been experiencing problems. Nevertheless, database inconsistencies may still exist in Magento. Try these actions:
Look for the error log that corresponds to your record number in Magento's var/report/ folder.
If you have access to the CLI, run bin/magento setup:upgrade and bin/magento cache:flush.
Make sure the right database credentials are in env.php in app/etc/.
Your database is operational because phpMyAdmin is functioning, but Magento may require a database reindex or missing tables. Tell us what the error log contains! paybyplatema
