Implement new step-by-step setup

data/migrations/env.py

@@ -18,7 +18,8 @@ config.set_main_option('sqlalchemy.url', unquote(app.config['DB_URI']))
 
 # Interpret the config file for Python logging.
 # This line sets up loggers basically.
-fileConfig(config.config_file_name)
+if config.config_file_name:
+    fileConfig(config.config_file_name)
 
 # add your model's MetaData object here
 # for 'autogenerate' support

data/runmigration.py

@@ -0,0 +1,20 @@
+import logging
+
+from alembic.config import Config
+from alembic.script import ScriptDirectory
+from alembic.environment import EnvironmentContext
+from alembic.migration import __name__ as migration_name
+
+def run_alembic_migration(log_handler=None):
+  if log_handler:
+    logging.getLogger(migration_name).addHandler(log_handler)
+
+  config = Config()
+  config.set_main_option("script_location", "data:migrations")
+  script = ScriptDirectory.from_config(config)
+
+  def fn(rev, context):
+    return script._upgrade_revs('head', rev)
+
+  with EnvironmentContext(config, script, fn=fn, destination_rev='head'):
+    script.run_env()