def keys(pattern = SCAN_PATTERN, count = DEFAULT_COUNT)
      return redis(&:keys) if pattern.nil?

      redis { |conn| conn.scan_each(match: prefix(pattern), count: count).to_a }
    end
def keys(pattern = SCAN_PATTERN, count = DEFAULT_COUNT)
      return redis(&:keys) if pattern.nil?

      redis { |conn| conn.scan_each(match: prefix(pattern), count: count).to_a }
    end
Find unique keys in redis

 @param [String] pattern a pattern to scan for in redis
 @param [Integer] count the maximum number of keys to delete
 @return [Array<String>] an array with active unique keys