이미지 자산 분류와 저장 경로 분산 보정

backend/src/lib/image-storage.js

@@ -75,10 +75,13 @@ async function optimizeAndPersist({ file, width, height, fit, quality }) {
     }
   }
 
-  const filename = nanoid() + '.webp'
-  const absoluteDir = path.join(UPLOAD_ROOT, OPTIMIZED_DIR)
+  const basename = nanoid()
+  const shardDirectory = basename.slice(0, 2)
+  const filename = basename + '.webp'
+  const relativeDir = path.join(OPTIMIZED_DIR, shardDirectory)
+  const absoluteDir = path.join(UPLOAD_ROOT, relativeDir)
   const absolutePath = path.join(absoluteDir, filename)
-  const src = '/uploads/' + OPTIMIZED_DIR + '/' + filename
+  const src = '/uploads/' + relativeDir.split(path.sep).join('/') + '/' + filename
 
   await fs.mkdir(absoluteDir, { recursive: true })
   await fs.writeFile(absolutePath, data)