Fix Enum Migration to properly deal with constraint changes

Since we're using non-native enums for our model, alembic has some issues knowing what the previous "type" actually was, and not specifying it correctly causes a bad constraint.

alembic/env.py

@@ -29,11 +29,13 @@ parent_dir = Path(__file__).parent.parent
 sys.path.append(parent_dir)
 
 from atst.app import make_config
+
 app_config = make_config()
-config.set_main_option('sqlalchemy.url', app_config['DATABASE_URI'])
+config.set_main_option("sqlalchemy.url", app_config["DATABASE_URI"])
 
 from atst.database import db
 from atst.models import *
+
 target_metadata = Base.metadata
 
 
@@ -51,8 +53,7 @@ def run_migrations_offline():
     """
     url = config.get_main_option("sqlalchemy.url")
     context.configure(
-        url=url, target_metadata=target_metadata, literal_binds=True,
-        compare_type=True
+        url=url, target_metadata=target_metadata, literal_binds=True, compare_type=True
     )
 
     with context.begin_transaction():
@@ -68,19 +69,19 @@ def run_migrations_online():
     """
     connectable = engine_from_config(
         config.get_section(config.config_ini_section),
-        prefix='sqlalchemy.',
-        poolclass=pool.NullPool)
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
 
     with connectable.connect() as connection:
         context.configure(
-            connection=connection,
-            target_metadata=target_metadata,
-            compare_type=True
+            connection=connection, target_metadata=target_metadata, compare_type=True
         )
 
         with context.begin_transaction():
             context.run_migrations()
 
+
 if context.is_offline_mode():
     run_migrations_offline()
 else: