app/shared/content_hash.py

import hashlib
import json
from typing import Any


def stable_content_hash(payload: dict[str, Any]) -> str:
    encoded = json.dumps(
        payload,
        ensure_ascii=False,
        sort_keys=True,
        separators=(",", ":"),
    ).encode("utf-8")
    return hashlib.sha256(encoded).hexdigest()