mozilla-releng / balrog / #5627

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Pull #3674

circleci

Use alembic instead of sqlalchemy-migrate for migrations

Existing databases are expected to have all existing migrations applied.
On upgrade, we'll detect the presence of the `migrate_version` table,
check that it has version 37, and set the alembic version to the
initial/current schema, `0001`.

Also remove the setuptools pin since it was there for
sqlalchemy-migrate's benefit.

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