Formatting and docstring improvements to the DB migrations

migrations/env.py

@@ -1,3 +1,5 @@
+"""Alembic environment file for SQLAlchemy."""
+
 import asyncio
 from logging.config import fileConfig
 
@@ -7,7 +9,7 @@ from sqlalchemy.engine import Connection
 from sqlalchemy.ext.asyncio import async_engine_from_config
 from sqlmodel import SQLModel
 
-from src.digimarks.models import Bookmark, PublicTag, User
+from src.digimarks.models import Bookmark, PublicTag, User  # noqa
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.
@@ -56,6 +58,7 @@ def run_migrations_offline() -> None:
 
 
 def do_run_migrations(connection: Connection) -> None:
+    """Run the migrations."""
     context.configure(
         connection=connection,
         target_metadata=target_metadata,