How to make a migration irreversible [1.7]

Hi,

I need to make a migration irreversible. And strangely I don't see any way to do it in the migration doc. I see that the Operation class has a property called `reversible`, but don't see any way to set it to False.

I had a legacy model that was generated with inspectdb, hence it had managed=False. But now when I Need to make changes to it I removed the managed flag and the migration is trying to delete the table and create it again. I removed the droptable operation and faked the migration to avoid the error. But if I revert the migration, that table is going to be dropped anyway, right? Because it's the revert operation of CreateTable. How do I stop the backward migration for this particular migration? There is nothing much important before it, so it's not a trouble if it's irreversible.

Am I missing something really obvious?

Thanks,
Bibhas

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