switched public api to caching library

backend/public/src/routes/posts.rs

@@ -15,8 +15,8 @@ use axum::{
     routing::get,
     Json, Router,
 };
+use cache::Expiration;
 use chrono::Utc;
-use fred::types::Expiration;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;