관리자 이미지 최적화 대시보드 추가

backend/src/db.js

@@ -705,6 +705,42 @@ async function deleteImageAssets(ids) {
   await query(`DELETE FROM image_assets WHERE id IN (${placeholders})`, uniqueIds)
   return rows.map(mapImageAssetRow)
 }
+
+async function getImageAssetStats() {
+  const [assetRows, jobRows] = await Promise.all([
+    query(
+      `SELECT COUNT(*) AS asset_count, COALESCE(SUM(byte_size), 0) AS total_byte_size, COALESCE(SUM(original_byte_size), 0) AS total_original_byte_size FROM image_assets`
+    ),
+    query(
+      `SELECT
+        COALESCE(SUM(CASE WHEN status = 'queued' THEN 1 ELSE 0 END), 0) AS queued_count,
+        COALESCE(SUM(CASE WHEN status = 'processing' THEN 1 ELSE 0 END), 0) AS processing_count,
+        COALESCE(SUM(CASE WHEN status = 'completed' THEN 1 ELSE 0 END), 0) AS completed_count,
+        COALESCE(SUM(CASE WHEN status = 'failed' THEN 1 ELSE 0 END), 0) AS failed_count,
+        COALESCE(SUM(CASE WHEN status = 'completed' AND reused_asset = 1 THEN 1 ELSE 0 END), 0) AS reused_count
+       FROM image_optimization_jobs`
+    ),
+  ])
+
+  const asset = assetRows[0] || {}
+  const jobs = jobRows[0] || {}
+  const totalByteSize = Number(asset.total_byte_size || 0)
+  const totalOriginalByteSize = Number(asset.total_original_byte_size || 0)
+  const savedByteSize = Math.max(0, totalOriginalByteSize - totalByteSize)
+
+  return {
+    assetCount: Number(asset.asset_count || 0),
+    totalByteSize,
+    totalOriginalByteSize,
+    savedByteSize,
+    savingsRatio: totalOriginalByteSize > 0 ? savedByteSize / totalOriginalByteSize : 0,
+    queuedCount: Number(jobs.queued_count || 0),
+    processingCount: Number(jobs.processing_count || 0),
+    completedCount: Number(jobs.completed_count || 0),
+    failedCount: Number(jobs.failed_count || 0),
+    reusedCount: Number(jobs.reused_count || 0),
+  }
+}
 async function createGameItem({ id, gameId, src, label }) {
   const createdAt = now()
   await query('INSERT INTO game_items (id, game_id, src, label, created_at) VALUES (?, ?, ?, ?, ?)', [
@@ -1595,6 +1631,7 @@ module.exports = {
   listRecentImageOptimizationJobs,
   listUnusedImageAssets,
   deleteImageAssets,
+  getImageAssetStats,
   createGameItem,
   updateGameItemLabel,
   deleteGameItem,