feat(sqlalchemy): format backend

backend/main.py

@@ -175,7 +175,9 @@ https://github.com/open-webui/open-webui
 def run_migrations():
     env = os.environ.copy()
     env["DATABASE_URL"] = DATABASE_URL
-    migration_task = subprocess.run(["alembic", f"-c{BACKEND_DIR}/alembic.ini", "upgrade", "head"], env=env)
+    migration_task = subprocess.run(
+        ["alembic", f"-c{BACKEND_DIR}/alembic.ini", "upgrade", "head"], env=env
+    )
     if migration_task.returncode > 0:
         raise ValueError("Error running migrations")