外部タグを分離 (#419) (#420)

**本番 DB のバックアップをかならずすること**

Reviewed-on: #420
Co-authored-by: miteruzo <miteruzo@naver.com>

frontend/src/lib/prefetchers.ts

@@ -128,6 +128,7 @@ const prefetchPostShow: Prefetcher = async (qc, url) => {
 const prefetchPostChanges: Prefetcher = async (qc, url) => {
   const id = url.searchParams.get ('id')
   const tag = url.searchParams.get ('tag')
+  const externalTag = url.searchParams.get ('external_tag')
   const page = Number (url.searchParams.get ('page') || 1)
   const limit = Number (url.searchParams.get ('limit') || 20)
 
@@ -141,9 +142,11 @@ const prefetchPostChanges: Prefetcher = async (qc, url) => {
   await qc.prefetchQuery ({
       queryKey: postsKeys.changes ({ ...(id && { id }),
 				     ...(tag && { tag }),
+				     ...(externalTag && { externalTag }),
 				     page, limit }),
       queryFn:  () => fetchPostChanges ({ ...(id && { id }),
 					  ...(tag && { tag }),
+					  ...(externalTag && { externalTag }),
 					  page, limit }) })
 }