Your migrate is out of date.  this was fixed one year ago:

https://github.com/openstack/sqlalchemy-migrate/commit/e9175a37ce0b0b0e87ad728c8a6a10bed100065b



On Thu, Oct 12, 2017 at 9:51 AM, Mike Bayer <mike...@zzzcomputing.com> wrote:
> On Thu, Oct 12, 2017 at 8:32 AM, Byron Yi <yibairen1...@gmail.com> wrote:
>> It appears that autoincrement=True is set by default for primary key when
>> upgrading from 1.0 to 1.1, no matter if it is integer (which is not in
>> glance; they use VARCHAR(36)).
>>
>> See https://bugs.launchpad.net/glance/+bug/1723097
>
> It defaults to True in 1.0, the change in 1.1 is that it defaults to "auto":
>
> http://docs.sqlalchemy.org/en/rel_1_1/changelog/migration_11.html#no-more-generation-of-an-implicit-key-for-composite-primary-key-w-auto-increment
>
> if that migrate operation is altering a column from Integer to String,
> then it's likely this is confusing things.   So this is a
> sqlalchemy-migrate bug.
>
>
>
>
>
>>
>> --
>> SQLAlchemy -
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>>
>> http://www.sqlalchemy.org/
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-- 
SQLAlchemy - 
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http://www.sqlalchemy.org/

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