code: def cache(ignore=None):
      
      def decorator(func):
          # Initialize both cached versions
          joblib_cached = constants.joblib_memory.cache(func, ignore=ignore)
          db_cached = DbMemoizedFunc(func, ignore)
  
          @functools.wraps(func)
          def wrapper(*args, **kwargs):
              """Dynamically choose the cache at call-time, not at import."""
              if func.__name__ == '_sia' and not config.CACHE_SIAS:
                  f = func
              elif config.CACHING_BACKEND == 'fs':
                  f = joblib_cached
              elif config.CACHING_BACKEND == 'db':
                  f = db_cached
              return f(*args, **kwargs)
  
          return wrapper
      return decorator
docs: Decorator for memoizing a function using either the filesystem or a
      database.