Option for permanent cache?

[DaniWinter]

I build this in my own CMS and I'm clearing the cache whenever an item gets changed so I don't need the cache to clear itself after x seconds.

[mmamedov]

Did you modify page-cache to have this option? If so maybe you could share your code.

One way that comes to my mind right now is to set expiration in seconds very high (years), that way you could get a permanent cache.