fix alembic settings

alembic/env.py

@@ -30,7 +30,7 @@ target_metadata = Base.metadata
 # ... etc.
 from config import settings
 
-config.set_main_option("sqlalchemy.url", settings.db_url)
+config.set_main_option("sqlalchemy.url", str(settings.db.url))
 
 
 def run_migrations_offline() -> None:

scripts/__init__.py

@@ -1,3 +1,5 @@
 from .check_available_ports import start_check as check_available_ports
 
-__all__ = ["check_available_ports"]
+__all__ = [
+    "check_available_ports",
+]