Correct path to migration scripts in alembic.ini
Modify script_location from alembic to alembic_migration.
Closes-Bug:
[alembic]
# path to migration scripts
-script_location = %(here)s/alembic
+script_location = %(here)s/alembic_migrations
# template used to generate migration files
# file_template = %%(rev)s_%%(slug)s
