perf: heavily optimize jikan cache by pre-warming individual anime objects and using 30-day TTLs for completed shows

internal/jikan/anime.go

@@ -19,6 +19,11 @@ func (c *Client) GetAnimeByID(id int) (Anime, error) {
 		return Anime{}, err
 	}
 
-	c.setCache(cacheKey, result.Data, time.Hour*24)
+	ttl := time.Hour * 24
+	if result.Data.Status == "Finished Airing" {
+		ttl = time.Hour * 24 * 30
+	}
+
+	c.setCache(cacheKey, result.Data, ttl)
 	return result.Data, nil
 }

internal/jikan/client.go

@@ -72,6 +72,21 @@ func (c *Client) setCache(key string, data interface{}, ttl time.Duration) {
 	})
 }
 
+// preWarmAnimeCache extracts individual anime from list responses and caches them
+func (c *Client) preWarmAnimeCache(animes []Anime) {
+	for _, a := range animes {
+		cacheKey := fmt.Sprintf("anime:%d", a.MalID)
+
+		// Smart TTL: Finished shows rarely change, cache for 30 days. Airing/Upcoming shows cache for 24 hours.
+		ttl := time.Hour * 24
+		if a.Status == "Finished Airing" {
+			ttl = time.Hour * 24 * 30
+		}
+
+		c.setCache(cacheKey, a, ttl)
+	}
+}
+
 // fetchWithRetry provides robust fetching respecting Jikan's strict 3 req/sec rate limit
 func (c *Client) fetchWithRetry(urlStr string, out interface{}) error {
 	maxRetries := 5

internal/jikan/search.go

@@ -32,6 +32,7 @@ func (c *Client) Search(query string, page int) (SearchResult, error) {
 		HasNextPage: result.Pagination.HasNextPage,
 	}
 
+	c.preWarmAnimeCache(result.Data)
 	c.setCache(cacheKey, res, time.Hour*1)
 	return res, nil
 }
@@ -58,6 +59,7 @@ func (c *Client) GetTopAnime(page int) (TopAnimeResult, error) {
 		HasNextPage: result.Pagination.HasNextPage,
 	}
 
+	c.preWarmAnimeCache(result.Data)
 	c.setCache(cacheKey, res, time.Hour*1)
 	return res, nil
 }

internal/jikan/seasons.go

@@ -34,6 +34,7 @@ func (c *Client) GetSchedule(day string) (ScheduleResult, error) {
 		HasNextPage: result.Pagination.HasNextPage,
 	}
 
+	c.preWarmAnimeCache(result.Data)
 	c.setCache(cacheKey, res, time.Hour*1)
 	return res, nil
 }
@@ -76,6 +77,7 @@ func (c *Client) GetSeasonsNow(page int) (TopAnimeResult, error) {
 		HasNextPage: result.Pagination.HasNextPage,
 	}
 
+	c.preWarmAnimeCache(result.Data)
 	c.setCache(cacheKey, res, time.Hour*1)
 	return res, nil
 }
@@ -102,6 +104,7 @@ func (c *Client) GetSeasonsUpcoming(page int) (TopAnimeResult, error) {
 		HasNextPage: result.Pagination.HasNextPage,
 	}
 
+	c.preWarmAnimeCache(result.Data)
 	c.setCache(cacheKey, res, time.Hour*1)
 	return res, nil
 }