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/posts.ts

@@ -28,15 +28,18 @@ export const fetchPost = async (id: string): Promise<Post> => await apiGet (`/po
 
 
 export const fetchPostChanges = async (
-    { post, tag, page, limit }: {
-	post?:  string
-	tag?:   string
-	page:   number
-	limit:  number }): Promise<{
+    { post, tag, externalTag, page, limit }: {
+	post?:        string
+	tag?:         string
+	externalTag?: string
+	page:         number
+	limit:        number }): Promise<{
     versions: PostVersion[]
     count:    number }> =>
 	await apiGet ('/posts/versions', { params: { ...(post && { post }),
 						     ...(tag && { tag }),
+						     ...(externalTag && {
+						       external_tag: externalTag }),
 						     page, limit } })