Fix alembic migrations importing app

Ensure we connect to loaded config db

data/migrations/env.py

@@ -14,14 +14,13 @@ from peewee import SqliteDatabase
 from data.database import all_models, db
 from data.migrations.tester import NoopTester, PopulateTestDataTester
 
-from app import app
 from data.model.sqlalchemybridge import gen_sqlalchemy_metadata
 from release import GIT_HEAD, REGION, SERVICE
 from util.morecollections import AttrDict
 
 config = context.config
-config.set_main_option('sqlalchemy.url', unquote(app.config['DB_URI']))
-
+DB_URI = config.get_main_option('db_uri')
+config.set_main_option('sqlalchemy.url', unquote(DB_URI))
 # Interpret the config file for Python logging.
 # This line sets up loggers basically.
 if config.config_file_name:
@@ -47,7 +46,7 @@ def get_tester():
         connecting to a production database.
     """
     if os.environ.get('TEST_MIGRATE', '') == 'true':
-        url = unquote(app.config['DB_URI'])
+        url = unquote(DB_URI)
         if url.find('.quay.io') < 0:
             return PopulateTestDataTester()
 
@@ -65,12 +64,11 @@ def run_migrations_offline():
     script output.
 
     """
-    url = unquote(app.config['DB_URI'])
+    url = unquote(DB_URI)
     context.configure(url=url, target_metadata=target_metadata, transactional_ddl=True)
 
     with context.begin_transaction():
-        context.run_migrations(tables=tables, tester=get_tester())
-
+        context.run_migrations(tables=tables)
 
 def run_migrations_online():
     """Run migrations in 'online' mode.
@@ -99,7 +97,7 @@ def run_migrations_online():
     try:
         with context.begin_transaction():
             try:
-                context.run_migrations(tables=tables, tester=get_tester())
+                context.run_migrations(tables=tables)
             except (CommandError, ResolutionError) as ex:
                 if 'No such revision' not in str(ex):
                     raise