I was performing an upgrade on my helpdesk from 1.14.6 to 1.15.2
During the upgrade, I received the attached error. It seem to abort the upgrade and timeout.
I had to restart the system, I returned to the helpdesk to resume the upgrade, I clicked upgrade again and it was then successful...
The step it failed was about adding a column to a table with over 100,000 records.. or something along those lines.
I just want to ensure there's nothing that I need to check?

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OS: Server 2016
MySQL 5.5
PHP 7.3.29