I am responsible for the SQL Anywhere Django driver 
<https://github.com/sqlanywhere/sqlany-django> and I'm trying to add 
support for Django 1.10. When I create a project and run "python manage.py 
migrate", it executes a bunch of SQL statements but then fails when 
altering the auth_user table to extend the username field to 150 
characters. The problem is that the username column has a unique index on 
it, and SQL Anywhere does not allow a column to be altered if there's an 
index on it. I was hoping there was a feature I could enable in the 
BaseDatabaseFeatures subclass that tells Django this but I couldn't find 
one. I seem to be stuck.

Does anyone know of a way I can tell Django to drop the unique index, alter 
the column, and then re-create the index? Is there some sort of hook that I 
can use to detect this case and drop / recreate the index myself?

Thanks

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