class CacheManager:
    """Stub for cache management. To be implemented."""
    def __init__(self, *args, **kwargs):
        pass

    def get(self, key):
        raise NotImplementedError("Cache get is not yet implemented.")

    def set(self, key, value, ttl=None):
        raise NotImplementedError("Cache set is not yet implemented.")

    def delete(self, key):
        raise NotImplementedError("Cache delete is not yet implemented.") 