import functools

def validate_schema(required_keys):
    def decorator(func):
        @functools.wraps(func)
        def wrapper(data, *args, **kwargs):
            if not isinstance(data, dict):
                raise TypeError(f"Expected dict, got {type(data).__name__}")
            missing = required_keys - data.keys()
            if missing:
                raise ValueError(f"Missing required keys: {missing}")
            return func(data, *args, **kwargs)
        return wrapper
    return decorator