feat(watchlist): Cache watchlist requests with matching E-Tags (#3901)

* perf(watchlist): add E-Tag caching to Plex watchlist requests

* refactor(watchlist): increase frequency of watchlist requests

* fix: sync watchlist every 3 min instead of 3 sec

server/lib/cache.ts

@@ -8,7 +8,8 @@ export type AvailableCacheIds =
   | 'imdb'
   | 'github'
   | 'plexguid'
-  | 'plextv';
+  | 'plextv'
+  | 'plexwatchlist';
 
 const DEFAULT_TTL = 300;
 const DEFAULT_CHECK_PERIOD = 120;
@@ -68,6 +69,7 @@ class CacheManager {
       stdTtl: 86400 * 7, // 1 week cache
       checkPeriod: 60,
     }),
+    plexwatchlist: new Cache('plexwatchlist', 'Plex Watchlist'),
   };
 
   public getCache(id: AvailableCacheIds): Cache {

server/lib/settings.ts

@@ -407,7 +407,7 @@ class Settings {
           schedule: '0 0 3 * * *',
         },
         'plex-watchlist-sync': {
-          schedule: '0 */10 * * * *',
+          schedule: '0 */3 * * * *',
         },
         'radarr-scan': {
           schedule: '0 0 4 * * *',

server/lib/watchlistsync.ts

@@ -62,7 +62,7 @@ class WatchlistSync {
 
     const plexTvApi = new PlexTvAPI(user.plexToken);
 
-    const response = await plexTvApi.getWatchlist({ size: 200 });
+    const response = await plexTvApi.getWatchlist({ size: 20 });
 
     const mediaItems = await Media.getRelatedMedia(
       response.items.map((i) => i.tmdbId)