```ruby
# frozen_string_literal: true

require "redis"

module MetalArchives
  module Cache
    ##
    # Redis-backed cache
    #
    class Redis < Base
      def initialize(options = {})
        super

        # Default TTL is 1 month
        options[:ttl] ||= (30 * 24 * 60 * 60)
      end

      def [](key)
        redis.get cache_key_for(key)
      end

      def []=(key, value)
        redis.set cache_key_for(key), value, ex: options[:ttl]
      end

      def clear
        redis.keys(cache_key_for("*")).each { |key| redis.del key }
      end

      def include?(key)
        redis.exists? key
      end

      def delete(key)
        redis.del key
      end

      private

      def cache_key_for(key)
        "metal_archives.cache.#{key}"
      end

      def redis
        @redis ||= ::Redis.new(**options.except(:ttl))
      end
    end
  end
end
```

Fix cache key not called
user
```ruby
# frozen_string_literal: true

require "redis"

module MetalArchives
  module Cache
    ##
    # Redis-backed cache
    #
    class Redis < Base
      def initialize(options = {})
        super

        # Default TTL is 1 month
        options[:ttl] ||= (30 * 24 * 60 * 60)
      end

      def [](key)
        redis.get cache_key_for(key)
      end

      def []=(key, value)
        redis.set cache_key_for(key), value, ex: options[:ttl]
      end

      def clear
        redis.keys(cache_key_for("*")).each { |key| redis.del key }
      end

      def include?(key)
        redis.exists? cache_key_for(key)
      end

      def delete(key)
        redis.del cache_key_for(key)
      end

      private

      def cache_key_for(key)
        "metal_archives.cache.#{key}"
      end

      def redis
        @redis ||= ::Redis.new(**options.except(:ttl))
      end
    end
  end
end
```
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