feat(cache): implement max entries limit for Bunny download source cache

app/api/versions/[versionId]/download/route.ts

@@ -39,6 +39,7 @@ type BunnyDownloadSourceCacheRecord = {
   expiresAt: number;
 };
 
+const BUNNY_SOURCE_CACHE_MAX_ENTRIES = 500;
 const bunnyDownloadSourceCache = new Map<string, BunnyDownloadSourceCacheRecord>();
 
 function sanitizeFileName(value: string): string {
@@ -95,6 +96,11 @@ function getCachedBunnyDownloadSource(cacheKey: string, now: number): BunnyDownl
 }
 
 function setCachedBunnyDownloadSource(cacheKey: string, source: BunnyDownloadSource | null, now: number): void {
+  if (bunnyDownloadSourceCache.size >= BUNNY_SOURCE_CACHE_MAX_ENTRIES) {
+    // Evict the oldest entry (Maps preserve insertion order)
+    const firstKey = bunnyDownloadSourceCache.keys().next().value;
+    if (firstKey !== undefined) bunnyDownloadSourceCache.delete(firstKey);
+  }
   bunnyDownloadSourceCache.set(cacheKey, {
     source,
     expiresAt: now + BUNNY_SOURCE_RESOLUTION_CACHE_TTL_MS,

app/api/watch/[videoId]/progress/route.ts

@@ -124,47 +124,21 @@ export async function POST(request: NextRequest, { params }: RouteParams) {
         // Calculate percentage
         const safeDuration = duration || 0;
         const percentage = safeDuration > 0 ? Math.min(100, (progress / safeDuration) * 100) : 0;
-        const tinyProgressDelta = 0.5;
-        const tinyDurationDelta = 1;
 
-        const existingWatchProgress = await db.watchProgress.findUnique({
+        // Client already filters tiny deltas (<2s) before sending — safe to upsert directly.
+        const watchProgress = await db.watchProgress.upsert({
             where: {
                 userId_versionId: {
                     userId: session.user.id,
                     versionId: targetVersion.id,
                 },
             },
-        });
-
-        if (existingWatchProgress) {
-            const progressDiff = Math.abs(existingWatchProgress.progress - progress);
-            const durationDiff = Math.abs(existingWatchProgress.duration - safeDuration);
-            if (progressDiff < tinyProgressDelta && durationDiff < tinyDurationDelta) {
-                return successResponse({
-                    success: true,
-                    progress: existingWatchProgress.progress,
-                    percentage: existingWatchProgress.percentage,
-                    skipped: true,
-                });
-            }
-        }
-
-        const watchProgress = existingWatchProgress
-            ? await db.watchProgress.update({
-                where: {
-                    userId_versionId: {
-                        userId: session.user.id,
-                        versionId: targetVersion.id,
-                    },
-                },
-                data: {
+            update: {
                 progress,
                 duration: safeDuration,
                 percentage,
             },
-            })
-            : await db.watchProgress.create({
-                data: {
+            create: {
                 userId: session.user.id,
                 versionId: targetVersion.id,
                 progress,