import re


def normalize_answer(raw: str) -> str:
    """Remove common LLM answer preambles and formatting."""
    text = raw.strip().lower()
    text = re.sub(r"the (answer|result) is:?\s*", "", text)
    text = re.sub(r"\*+", "", text)
    text = re.sub(r"```.*?```", "", text, flags=re.DOTALL)
    text = re.sub(r"`[^`]+`", lambda m: m.group().strip("`"), text)
    text = re.sub(r"\s+", " ", text)
    return text.strip()


FORBIDDEN_KEYWORDS = [
    "DROP",
    "DELETE",
    "INSERT",
    "UPDATE",
    "ALTER",
    "CREATE",
    "TRUNCATE",
]


def is_safe_query(query: str) -> bool:
    """Check if query is safe (SELECT-only)."""
    upper = query.upper()
    return not any(kw in upper for kw in FORBIDDEN_KEYWORDS)