[Forums] How I can rollback deleted roles from Systems/Role entity?

I assume you implemented a hard delete in your screen (remove lines instead of setting IsActive = 0) so those roles are gone from the Role entity, there's no flag to change. If you need those records, you would have to revert to a database backup.

If you don't have a database backup, you'll have to recreate those Roles by hand in your module.

You should be very wary of hard deleting records from internal entities like Role or Entity - this sort of behaviour is not documented so the platform can act in unexpected ways.