While upgrading several of my sites to 5.35.1 (from 5.28 or later) I experienced a nasty database crash in the step called core-issue#365 - Add created_date to civicrm_action_schedule
$Fatal Error Details = Array ( [callback] => Array (  => CRM_Core_Error  => exceptionHandler ) [code] => -1 [message] => DB Error: unknown error [mode] => 16 [debug_info] => ALTER TABLE `civicrm_action_schedule` ADD COLUMN `created_date` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'When was the schedule reminder created.' [nativecode=1118 ** Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs]
What can I do?
(Note in my case this is not related to Upgrade fails with Row size too large error)