Please note that patch was merged.
This patch will prevent(with a detailed ERROR) any attempt to modify an
existing DB upgrade script since this may lead to upgrade problems.
The correct way to change something in the database is a new upgrade script.
In a case that the upgrade script must be changed, this can be forced by
adding a special keyword to your commit header.
Please see  description for details.
If you have any questions, please let me know.
 [ERROR] : Changing an existing upgrade script is dangerous and can
cause upgrade problems,
if you are doing that in purpose and sure that there is no
other way to fix the issue you
are working on, please add the key
'Allow-db-upgrade-script-changes:Yes' to your patch commit message."