Method insert

src/cache/mod.rs:73–88

(&self, key: K, value: V)

    }

    pub fn insert(&self, key: K, value: V) {
        let mut cache = self.cache.write().unwrap();
        
        // Simple eviction: remove oldest entry if at capacity
        if cache.len() >= self.capacity && !cache.contains_key(&key)
            && let Some((oldest_key, _)) = cache.iter()
                .min_by_key(|(_, entry)| entry.last_accessed) {
                let oldest_key = oldest_key.clone();
                cache.remove(&oldest_key);
            }
        
        cache.insert(key, CacheEntry {
            value,
            last_accessed: Instant::now(),
        });
    }

    pub fn invalidate(&self, key: &K) {
        self.cache.write().unwrap().remove(key);