```python
from fastapi import FastAPI

import helpers  # noqa: F401 (the provided API)

app = FastAPI()


@app.get("/users/{user_id}")
async def get_user(user_id: int):
    """Return user details for the given user_id."""
    # Use the async helper to load the user (non‑blocking)
    return await helpers.aload_user(user_id)
```