This PR adds an important test for the SQLA/alembic migration system #834
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It automatically creates 2 empty databases and creates the tables using the SQLA models and the migrations. In the end it checks if there are any differences in the schemata of the two databases.
@waychal @lekah
We could also do something similar to ensure that the Django/SQLA database schemata are compatible (apart from what we know that it is certainly different, like the attributes). This may help a lot for the transition scripts like those of #800