fix: 대체 아이템 삭제와 미사용 정리 기준 보정

backend/src/db.js

@@ -2027,37 +2027,57 @@ async function findUnusedCustomItems({ queryText = '' } = {}) {
   const whereClause = hasQuery ? 'WHERE c.label LIKE ? OR c.src LIKE ? OR u.email LIKE ? OR u.nickname LIKE ?' : ''
   const params = hasQuery ? [search, search, search, search] : []
 
-  const rows = await query(
-    `
-      SELECT
-        c.id,
-        c.owner_id,
-        c.src,
-        c.label,
-        c.replaced_by_item_id,
-        c.replaced_by_src,
-        c.replaced_by_label,
-        c.replaced_at,
-        c.created_at,
-        u.nickname,
-        u.email
-      FROM custom_items c
-      INNER JOIN users u ON u.id = c.owner_id
-      ${whereClause}
-      ORDER BY c.created_at DESC
-    `,
-    params
-  )
+  const [rows, topicItemRows, usageMeta] = await Promise.all([
+    query(
+      `
+        SELECT
+          c.id,
+          c.owner_id,
+          c.src,
+          c.label,
+          c.replaced_by_item_id,
+          c.replaced_by_src,
+          c.replaced_by_label,
+          c.replaced_at,
+          c.created_at,
+          u.nickname,
+          u.email
+        FROM custom_items c
+        INNER JOIN users u ON u.id = c.owner_id
+        ${whereClause}
+        ORDER BY c.created_at DESC
+      `,
+      params
+    ),
+    query(
+      `
+        SELECT ti.topic_id, tp.name AS topic_name, ti.src
+        FROM topic_items ti
+        LEFT JOIN topics tp ON tp.id = ti.topic_id
+      `
+    ),
+    getCustomItemUsageMeta(),
+  ])
+
+  const templateLinkedBySrc = new Map()
+  topicItemRows.forEach((row) => {
+    if (!row?.src) return
+    if (!templateLinkedBySrc.has(row.src)) templateLinkedBySrc.set(row.src, new Map())
+    templateLinkedBySrc.get(row.src).set(row.topic_id, {
+      id: row.topic_id,
+      name: row.topic_name || row.topic_id,
+    })
+  })
 
-  const { usageMap } = await getCustomItemUsageMeta()
   return rows
     .map((row) => ({
       ...mapCustomItemRow(row),
       ownerName: row.nickname || row.email,
       ownerEmail: row.email,
-      usageCount: usageMap.get(row.id) || 0,
+      usageCount: usageMeta.usageMap.get(row.id) || 0,
+      linkedTemplates: Array.from((templateLinkedBySrc.get(row.src) || new Map()).values()),
     }))
-    .filter((item) => item.usageCount === 0 || !!item.replacedAt)
+    .filter((item) => ((item.usageCount === 0 && item.linkedTemplates.length === 0) || !!item.replacedAt))
 }
 
 async function getFavoriteStatsForTierListIds(tierListIds, userId = '') {

backend/src/routes/admin.js

@@ -54,6 +54,7 @@ const {
   listRecentImageOptimizationJobs,
   clearImageOptimizationJobs,
   cleanupMissingUploadReferences,
+  listReferencedUploadSources,
   replaceUploadSourceReferences,
   updateCustomItemDisplayReferences,
   clearCustomItemReplacement,
@@ -546,6 +547,12 @@ async function removeCustomItemFiles(items) {
   )
 }
 
+async function removeUnreferencedCustomItemFiles(items) {
+  const referencedSrcs = new Set(await listReferencedUploadSources())
+  const removableItems = (items || []).filter((item) => item?.src && !referencedSrcs.has(item.src))
+  await removeCustomItemFiles(removableItems)
+}
+
 async function promoteLibraryItemToTemplateItem({ item, templateId }) {
   return createTopicItem({
     id: nanoid(),
@@ -776,13 +783,14 @@ router.delete('/custom-items/:itemId', requireAdmin, async (req, res) => {
     return res.json({ ok: true, sourceType: 'template' })
   }
 
+  const canDeleteReplacedUserItem = target.sourceType === 'user' && !!target.replacedAt
   if (!target.canDelete) return res.status(409).json({ error: 'item_locked' })
-  if (target.linkedTemplates.length > 0) return res.status(409).json({ error: 'item_linked' })
-  if (target.usageCount > 0) return res.status(409).json({ error: 'item_in_use' })
+  if (!canDeleteReplacedUserItem && target.linkedTemplates.length > 0) return res.status(409).json({ error: 'item_linked' })
+  if (!canDeleteReplacedUserItem && target.usageCount > 0) return res.status(409).json({ error: 'item_in_use' })
 
   const items = await findCustomItemsByIds([target.id])
   await deleteCustomItems([target.id])
-  await removeCustomItemFiles(items)
+  await removeUnreferencedCustomItemFiles(items)
   res.json({ ok: true, sourceType: 'user' })
 })
 
@@ -1135,7 +1143,7 @@ router.delete('/custom-items', requireAdmin, async (req, res) => {
   const items = await findUnusedCustomItems({ queryText: parsed.data.q })
   const ids = items.map((item) => item.id)
   await deleteCustomItems(ids)
-  await removeCustomItemFiles(items)
+  await removeUnreferencedCustomItemFiles(items)
   res.json({ ok: true, deletedCount: ids.length })
 })