diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/archives/ArchiveService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/archives/ArchiveService.scala
index 2a0f3e90..34d38333 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/archives/ArchiveService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/archives/ArchiveService.scala
@@ -13,7 +13,7 @@ import cats.Monad
 class ArchiveService[F[_]: Monad](
   archiveRepository: ArchiveRepository[F],
   contentTypeService: ContentTypeService[F]
-)(using transactor: Executer[F, IO]) {
+)(using executer: Executer[F, IO]) {
 
   def actions(contentTypeId: ContentTypeId): Action[Seq[ResponseArchive]] = {
     Continue(archiveRepository.get(contentTypeId), Action.done[Seq[ResponseArchive]])
@@ -22,7 +22,7 @@ class ArchiveService[F[_]: Monad](
   def get: IO[Seq[ResponseArchive]] = {
     for {
       c <- contentTypeService.findByName("article").throwIfNone(NotFound(detail = "content-type not found: article"))
-      articles <- transactor.transact(actions(c.id))
+      articles <- executer.transact(actions(c.id))
     } yield articles
   }
 
diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/articles/ArticleService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/articles/ArticleService.scala
index 0e0a2fc0..eaf5eb8a 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/articles/ArticleService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/articles/ArticleService.scala
@@ -15,7 +15,7 @@ import net.yoshinorin.qualtet.syntax.*
 class ArticleService[F[_]: Monad](
   articleRepository: ArticleRepository[F],
   contentTypeService: ContentTypeService[F]
-)(using transactor: Executer[F, IO]) {
+)(using executer: Executer[F, IO]) {
 
   def actions(
     contentTypeId: ContentTypeId,
@@ -53,7 +53,7 @@ class ArticleService[F[_]: Monad](
   )(f: (ContentTypeId, A, ArticlesQueryParameter) => Action[Seq[(Int, ResponseArticle)]]): IO[ResponseArticleWithCount] = {
     for {
       c <- contentTypeService.findByName("article").throwIfNone(NotFound(detail = "content-type not found: article"))
-      articlesWithCount <- transactor.transact(f(c.id, data, queryParam))
+      articlesWithCount <- executer.transact(f(c.id, data, queryParam))
     } yield
       if (articlesWithCount.nonEmpty) {
         ResponseArticleWithCount(articlesWithCount.map(_._1).headOption.getOrElse(0), articlesWithCount.map(_._2))
diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/authors/AuthorService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/authors/AuthorService.scala
index 8e49fac7..745147f2 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/authors/AuthorService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/authors/AuthorService.scala
@@ -10,7 +10,7 @@ import net.yoshinorin.qualtet.syntax.*
 
 class AuthorService[F[_]: Monad](
   authorRepository: AuthorRepository[F]
-)(using transactor: Executer[F, IO]) {
+)(using executer: Executer[F, IO]) {
 
   def upsertActions(data: Author): Action[Int] = {
     Continue(authorRepository.upsert(data), Action.done[Int])
@@ -40,7 +40,7 @@ class AuthorService[F[_]: Monad](
    */
   def create(data: Author): IO[ResponseAuthor] = {
     for {
-      _ <- transactor.transact(upsertActions(data))
+      _ <- executer.transact(upsertActions(data))
       a <- this.findByName(data.name).throwIfNone(InternalServerError("user not found"))
     } yield a
   }
@@ -51,7 +51,7 @@ class AuthorService[F[_]: Monad](
    * @return Authors
    */
   def getAll: IO[Seq[ResponseAuthor]] = {
-    transactor.transact(fetchActions)
+    executer.transact(fetchActions)
   }
 
   /**
@@ -61,7 +61,7 @@ class AuthorService[F[_]: Monad](
    * @return Author
    */
   def findById(id: AuthorId): IO[Option[ResponseAuthor]] = {
-    transactor.transact(findByIdActions(id))
+    executer.transact(findByIdActions(id))
   }
 
   /**
@@ -71,7 +71,7 @@ class AuthorService[F[_]: Monad](
    * @return Author
    */
   def findByIdWithPassword(id: AuthorId): IO[Option[Author]] = {
-    transactor.transact(findByIdWithPasswordActions(id))
+    executer.transact(findByIdWithPasswordActions(id))
   }
 
   /**
@@ -81,7 +81,7 @@ class AuthorService[F[_]: Monad](
    * @return Author
    */
   def findByName(name: AuthorName): IO[Option[ResponseAuthor]] = {
-    transactor.transact(findByNameActions(name))
+    executer.transact(findByNameActions(name))
   }
 
 }
diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/contentTaggings/ContentTaggingService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/contentTaggings/ContentTaggingService.scala
index fc351076..6e807901 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/contentTaggings/ContentTaggingService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/contentTaggings/ContentTaggingService.scala
@@ -10,7 +10,7 @@ import net.yoshinorin.qualtet.infrastructure.db.Executer
 
 class ContentTaggingService[F[_]: Monad](
   contentTaggingRepository: ContentTaggingRepository[F]
-)(using transactor: Executer[F, IO]) {
+)(using executer: Executer[F, IO]) {
 
   def findByTagIdActions(id: TagId): Action[Seq[ContentTagging]] = {
     Continue(contentTaggingRepository.findByTagId(id), Action.done[Seq[ContentTagging]])
@@ -43,6 +43,6 @@ class ContentTaggingService[F[_]: Monad](
   }
 
   def findByTagId(id: TagId): IO[Seq[ContentTagging]] = {
-    transactor.transact(findByTagIdActions(id))
+    executer.transact(findByTagIdActions(id))
   }
 }
diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/contentTypes/ContentTypeService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/contentTypes/ContentTypeService.scala
index 58881f7c..4fbe5ab3 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/contentTypes/ContentTypeService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/contentTypes/ContentTypeService.scala
@@ -13,7 +13,7 @@ import net.yoshinorin.qualtet.syntax.*
 class ContentTypeService[F[_]: Monad](
   contentRepository: ContentTypeRepository[F],
   cache: CacheModule[String, ContentType]
-)(using transactor: Executer[F, IO])
+)(using executer: Executer[F, IO])
     extends Cacheable {
 
   def upsertActions(data: ContentType): Action[Int] = {
@@ -35,7 +35,7 @@ class ContentTypeService[F[_]: Monad](
       case Some(x: ContentType) => IO(x)
       case None =>
         for {
-          _ <- transactor.transact(upsertActions(data))
+          _ <- executer.transact(upsertActions(data))
           c <- this.findByName(data.name).throwIfNone(InternalServerError("contentType not found"))
         } yield c
     }
@@ -56,7 +56,7 @@ class ContentTypeService[F[_]: Monad](
 
     def fromDB(name: String): IO[Option[ContentType]] = {
       for {
-        x <- transactor.transact(actions(name))
+        x <- executer.transact(actions(name))
       } yield (x, cache.put(name, x))._1
     }
 
@@ -73,7 +73,7 @@ class ContentTypeService[F[_]: Monad](
    * @return ContentTypes
    */
   def getAll: IO[Seq[ContentType]] = {
-    transactor.transact(getAllActions)
+    executer.transact(getAllActions)
   }
 
   def invalidate(): IO[Unit] = {
diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/contents/ContentService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/contents/ContentService.scala
index 1e1f9fe4..e22761fa 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/contents/ContentService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/contents/ContentService.scala
@@ -28,7 +28,7 @@ class ContentService[F[_]: Monad](
   seriesService: SeriesService[F],
   contentSerializingService: ContentSerializingService[F]
 )(using
-  transactor: Executer[F, IO]
+  executer: Executer[F, IO]
 ) {
 
   def upsertActions(data: Content): Action[Int] = {
@@ -124,16 +124,16 @@ class ContentService[F[_]: Monad](
     val maybeExternalResources = externalResources.flatMap(a => a.values.map(v => ExternalResource(data.id, a.kind, v)))
 
     val queries = for {
-      contentUpsert <- transactor.perform(upsertActions(data))
-      robotsUpsert <- transactor.perform(robotsService.upsertActions(Robots(data.id, robotsAttributes)))
-      currentTags <- transactor.perform(tagService.findByContentIdActions(data.id))
-      tagsDiffDelete <- transactor.perform(contentTaggingService.bulkDeleteActions(data.id, currentTags.map(_.id).diff(tags.getOrElse(List()).map(t => t.id))))
-      tagsBulkUpsert <- transactor.perform(tagService.bulkUpsertActions(tags))
+      contentUpsert <- executer.perform(upsertActions(data))
+      robotsUpsert <- executer.perform(robotsService.upsertActions(Robots(data.id, robotsAttributes)))
+      currentTags <- executer.perform(tagService.findByContentIdActions(data.id))
+      tagsDiffDelete <- executer.perform(contentTaggingService.bulkDeleteActions(data.id, currentTags.map(_.id).diff(tags.getOrElse(List()).map(t => t.id))))
+      tagsBulkUpsert <- executer.perform(tagService.bulkUpsertActions(tags))
       // TODO: check diff and clean up contentTagging before upsert
-      contentTaggingBulkUpsert <- transactor.perform(contentTaggingService.bulkUpsertActions(contentTagging))
-      contentSerializingUpsert <- transactor.perform(contentSerializingService.upsertActions(contentSerializing))
+      contentTaggingBulkUpsert <- executer.perform(contentTaggingService.bulkUpsertActions(contentTagging))
+      contentSerializingUpsert <- executer.perform(contentSerializingService.upsertActions(contentSerializing))
       // TODO: check diff and clean up external_resources before upsert
-      externalResourceBulkUpsert <- transactor.perform(externalResourceService.bulkUpsertActions(maybeExternalResources))
+      externalResourceBulkUpsert <- executer.perform(externalResourceService.bulkUpsertActions(maybeExternalResources))
     } yield (
       contentUpsert,
       currentTags,
@@ -146,7 +146,7 @@ class ContentService[F[_]: Monad](
     )
 
     for {
-      _ <- transactor.transact8[Int, Seq[Tag], Unit, Int, Int, Int, Int, Int](queries)
+      _ <- executer.transact8[Int, Seq[Tag], Unit, Int, Int, Int, Int, Int](queries)
       c <- this.findByPath(data.path).throwIfNone(InternalServerError("content not found")) // NOTE: 404 is better?
       // TODO: Should return `ResponseContent` instead of `Content`.
     } yield c
@@ -160,11 +160,11 @@ class ContentService[F[_]: Monad](
   def delete(id: ContentId): IO[Unit] = {
 
     val queries = for {
-      externalResourcesDelete <- transactor.perform(externalResourceService.deleteActions(id))
+      externalResourcesDelete <- executer.perform(externalResourceService.deleteActions(id))
       // TODO: Tags should be deleted automatically after delete a content which are not refer from other contents.
-      contentTaggingDelete <- transactor.perform(contentTaggingService.deleteByContentIdActions(id))
-      robotsDelete <- transactor.perform(robotsService.deleteActions(id))
-      contentDelete <- transactor.perform(deleteActions(id))
+      contentTaggingDelete <- executer.perform(contentTaggingService.deleteByContentIdActions(id))
+      robotsDelete <- executer.perform(robotsService.deleteActions(id))
+      contentDelete <- executer.perform(deleteActions(id))
     } yield (
       externalResourcesDelete,
       contentTaggingDelete,
@@ -174,7 +174,7 @@ class ContentService[F[_]: Monad](
 
     for {
       _ <- this.findById(id).throwIfNone(NotFound(detail = s"content not found: ${id}"))
-      _ <- transactor.transact4[Unit, Unit, Unit, Unit](queries)
+      _ <- executer.transact4[Unit, Unit, Unit, Unit](queries)
     } yield ()
   }
 
@@ -185,7 +185,7 @@ class ContentService[F[_]: Monad](
    * @return ResponseContent instance
    */
   def findByPath(path: Path): IO[Option[Content]] = {
-    transactor.transact(findByPathActions(path))
+    executer.transact(findByPathActions(path))
   }
 
   /**
@@ -205,11 +205,11 @@ class ContentService[F[_]: Monad](
    * @return ResponseContent instance
    */
   def findById(id: ContentId): IO[Option[Content]] = {
-    transactor.transact(findByIdActions(id))
+    executer.transact(findByIdActions(id))
   }
 
   def findBy[A](data: A)(f: A => Action[Option[ReadContentDbRow]]): IO[Option[ResponseContent]] = {
-    transactor.transact(f(data)).flatMap {
+    executer.transact(f(data)).flatMap {
       case None => IO(None)
       case Some(x) =>
         val stripedContent = x.content.stripHtmlTags.replaceAll("\n", "")
diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/search/SearchService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/search/SearchService.scala
index 8524710a..24623fb1 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/search/SearchService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/search/SearchService.scala
@@ -17,7 +17,7 @@ import scala.annotation.tailrec
 class SearchService[F[_]: Monad](
   searchConfig: SearchConfig,
   searchRepository: SearchRepository[F]
-)(using transactor: Executer[F, IO]) {
+)(using executer: Executer[F, IO]) {
 
   def actions(query: List[String]): Action[Seq[(Int, ResponseSearch)]] = {
     Continue(searchRepository.search(query), Action.done[Seq[(Int, ResponseSearch)]])
@@ -114,7 +114,7 @@ class SearchService[F[_]: Monad](
       _ <- IO(if (accErrors.nonEmpty) {
         throw new UnprocessableEntity(detail = "Invalid search conditions. Please see error details.", errors = Some(accErrors))
       })
-      searchResult <- transactor.transact(actions(queryStrings))
+      searchResult <- executer.transact(actions(queryStrings))
     } yield
       if (searchResult.nonEmpty) {
         val r = searchResult.map { x =>
diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/series/SeriesService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/series/SeriesService.scala
index 08d3a2ef..8c4ed107 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/series/SeriesService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/series/SeriesService.scala
@@ -13,7 +13,7 @@ import wvlet.airframe.ulid.ULID
 class SeriesService[F[_]: Monad](
   seriesRepository: SeriesRepository[F],
   articleService: ArticleService[F]
-)(using transactor: Executer[F, IO]) {
+)(using executer: Executer[F, IO]) {
 
   def upsertActions(data: Series): Action[Int] = {
     Continue(seriesRepository.upsert(data), Action.done[Int])
@@ -37,12 +37,12 @@ class SeriesService[F[_]: Monad](
     this.findByName(data.name).flatMap {
       case Some(s: Series) =>
         for {
-          _ <- transactor.transact(upsertActions(Series(s.id, s.name, data.title, data.description)))
+          _ <- executer.transact(upsertActions(Series(s.id, s.name, data.title, data.description)))
           s <- this.findByName(data.name).throwIfNone(NotFound(detail = "series not found"))
         } yield s
       case None =>
         for {
-          _ <- transactor.transact(upsertActions(Series(SeriesId(ULID.newULIDString.toLower), data.name, data.title, data.description)))
+          _ <- executer.transact(upsertActions(Series(SeriesId(ULID.newULIDString.toLower), data.name, data.title, data.description)))
           s <- this.findByName(data.name).throwIfNone(NotFound(detail = "series not found"))
         } yield s
     }
@@ -55,12 +55,12 @@ class SeriesService[F[_]: Monad](
    * @return Series Instance
    */
   def findByName(name: SeriesName): IO[Option[Series]] = {
-    transactor.transact(findByNameActions(name))
+    executer.transact(findByNameActions(name))
   }
 
   def get(name: SeriesName): IO[ResponseSeries] = {
     for {
-      series <- transactor.transact(findByNameActions(name)).throwIfNone(NotFound(detail = s"series not found: ${name.value}"))
+      series <- executer.transact(findByNameActions(name)).throwIfNone(NotFound(detail = s"series not found: ${name.value}"))
       seriesWithArticles <- articleService.getBySeriesName(series.name)
     } yield {
       ResponseSeries(series.id, series.name, series.title, series.description, seriesWithArticles.articles)
@@ -73,7 +73,7 @@ class SeriesService[F[_]: Monad](
    * @return Series
    */
   def getAll: IO[Seq[Series]] = {
-    transactor.transact(fetchActions)
+    executer.transact(fetchActions)
   }
 
 }
diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/sitemaps/SitemapService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/sitemaps/SitemapService.scala
index 2f9cf367..f8ac0083 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/sitemaps/SitemapService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/sitemaps/SitemapService.scala
@@ -11,7 +11,7 @@ import net.yoshinorin.qualtet.domains.Cacheable
 class SitemapService[F[_]: Monad](
   sitemapRepository: SitemapsRepository[F],
   cache: CacheModule[String, Seq[Url]]
-)(using transactor: Executer[F, IO])
+)(using executer: Executer[F, IO])
     extends Cacheable {
 
   private val cacheKey = "sitemaps-full-cache"
@@ -25,7 +25,7 @@ class SitemapService[F[_]: Monad](
       case Some(x: Seq[Url]) => IO(x)
       case _ =>
         for {
-          x <- transactor.transact(getActions)
+          x <- executer.transact(getActions)
         } yield (x, cache.put(cacheKey, x))._1
     }
   }
diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/tags/TagService.scala b/src/main/scala/net/yoshinorin/qualtet/domains/tags/TagService.scala
index 62b7d438..fe3736f1 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/tags/TagService.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/tags/TagService.scala
@@ -14,7 +14,7 @@ import net.yoshinorin.qualtet.syntax.*
 class TagService[F[_]: Monad](
   tagRepository: TagRepository[F],
   contentTaggingService: ContentTaggingService[F]
-)(using transactor: Executer[F, IO]) {
+)(using executer: Executer[F, IO]) {
 
   def bulkUpsertActions(data: Option[List[Tag]]): Action[Int] = {
     data match {
@@ -49,7 +49,7 @@ class TagService[F[_]: Monad](
    * @return tags
    */
   def getAll: IO[Seq[ResponseTag]] = {
-    transactor.transact(getAllActions)
+    executer.transact(getAllActions)
   }
 
   /**
@@ -59,7 +59,7 @@ class TagService[F[_]: Monad](
    * @return maybe Tag
    */
   def findById(id: TagId): IO[Option[Tag]] = {
-    transactor.transact(findByIdActions(id))
+    executer.transact(findByIdActions(id))
   }
 
   /**
@@ -69,7 +69,7 @@ class TagService[F[_]: Monad](
    * @return maybe Tag
    */
   def findByName(tagName: TagName): IO[Option[Tag]] = {
-    transactor.transact(findByNameActions(tagName))
+    executer.transact(findByNameActions(tagName))
   }
 
   /**
@@ -105,13 +105,13 @@ class TagService[F[_]: Monad](
    */
   def delete(id: TagId): IO[Unit] = {
     val queries = for {
-      contentTaggingDelete <- transactor.perform(contentTaggingService.deleteByTagIdActions(id))
-      tagDelete <- transactor.perform(deleteActions(id))
+      contentTaggingDelete <- executer.perform(contentTaggingService.deleteByTagIdActions(id))
+      tagDelete <- executer.perform(deleteActions(id))
     } yield (contentTaggingDelete, tagDelete)
 
     for {
       _ <- this.findById(id).throwIfNone(NotFound(detail = s"tag not found: ${id}"))
-      _ <- transactor.transact2(queries)
+      _ <- executer.transact2(queries)
     } yield ()
   }
 }