diff --git a/src/main/kotlin/dev/usbharu/hideout/query/UserQueryServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/query/UserQueryServiceImpl.kt
index 9d18d2cd..647b8d5f 100644
--- a/src/main/kotlin/dev/usbharu/hideout/query/UserQueryServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/query/UserQueryServiceImpl.kt
@@ -9,9 +9,13 @@ import org.jetbrains.exposed.sql.and
 import org.jetbrains.exposed.sql.select
 import org.jetbrains.exposed.sql.selectAll
 import org.koin.core.annotation.Single
+import org.slf4j.LoggerFactory
 
 @Single
 class UserQueryServiceImpl : UserQueryService {
+
+    private val logger = LoggerFactory.getLogger(UserQueryServiceImpl::class.java)
+
     override suspend fun findAll(limit: Int, offset: Long): List<User> =
         Users.selectAll().limit(limit, offset).map { it.toUser() }
 
@@ -28,9 +32,12 @@ class UserQueryServiceImpl : UserQueryService {
             }
             .toUser()
 
-    override suspend fun findByUrl(url: String): User = Users.select { Users.url eq url }
-        .singleOr { FailedToGetResourcesException("url: $url  is duplicate or does not exist.", it) }
-        .toUser()
+    override suspend fun findByUrl(url: String): User {
+        logger.trace("findByUrl url: $url")
+        return Users.select { Users.url eq url }
+            .singleOr { FailedToGetResourcesException("url: $url  is duplicate or does not exist.", it) }
+            .toUser()
+    }
 
     override suspend fun findByIds(ids: List<Long>): List<User> =
         Users.select { Users.id inList ids }.map { it.toUser() }
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/ap/APLikeService.kt b/src/main/kotlin/dev/usbharu/hideout/service/ap/APLikeService.kt
index 0313acf8..6f88d87a 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/ap/APLikeService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/ap/APLikeService.kt
@@ -28,18 +28,19 @@ class APLikeServiceImpl(
         val actor = like.actor ?: throw IllegalActivityPubObjectException("actor is null")
         val content = like.content ?: throw IllegalActivityPubObjectException("content is null")
         like.`object` ?: throw IllegalActivityPubObjectException("object is null")
-        transaction.transaction {
-            val person = apUserService.fetchPerson(actor)
+        transaction.transaction(java.sql.Connection.TRANSACTION_SERIALIZABLE) {
+            val person = apUserService.fetchPersonWithEntity(actor)
             apNoteService.fetchNote(like.`object`!!)
 
-            val user = userQueryService.findByUrl(
-                person.url
-                    ?: throw IllegalActivityPubObjectException("actor is not found")
-            )
 
             val post = postQueryService.findByUrl(like.`object`!!)
 
-            reactionService.receiveReaction(content, actor.substringAfter("://").substringBefore("/"), user.id, post.id)
+            reactionService.receiveReaction(
+                content,
+                actor.substringAfter("://").substringBefore("/"),
+                person.second.id,
+                post.id
+            )
         }
         return ActivityPubStringResponse(HttpStatusCode.OK, "")
     }
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/ap/APNoteService.kt b/src/main/kotlin/dev/usbharu/hideout/service/ap/APNoteService.kt
index 255c9804..45583001 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/ap/APNoteService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/ap/APNoteService.kt
@@ -120,7 +120,8 @@ class APNoteServiceImpl(
         url: String
     ): Note {
         if (note.id == null) {
-            return internalNote(note, targetActor, url)
+            throw IllegalArgumentException("id is null")
+//            return internalNote(note, targetActor, url)
         }
 
         val findByApId = try {
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/core/ExposedTransaction.kt b/src/main/kotlin/dev/usbharu/hideout/service/core/ExposedTransaction.kt
index a58cfe04..c15327a4 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/core/ExposedTransaction.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/core/ExposedTransaction.kt
@@ -6,7 +6,13 @@ import org.koin.core.annotation.Single
 @Single
 class ExposedTransaction : Transaction {
     override suspend fun <T> transaction(block: suspend () -> T): T {
-        return newSuspendedTransaction {
+        return newSuspendedTransaction(transactionIsolation = java.sql.Connection.TRANSACTION_SERIALIZABLE) {
+            block()
+        }
+    }
+
+    override suspend fun <T> transaction(transactionLevel: Int, block: suspend () -> T): T {
+        return newSuspendedTransaction(transactionIsolation = transactionLevel) {
             block()
         }
     }
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/core/Transaction.kt b/src/main/kotlin/dev/usbharu/hideout/service/core/Transaction.kt
index 40911be1..105420ed 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/core/Transaction.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/core/Transaction.kt
@@ -2,4 +2,5 @@ package dev.usbharu.hideout.service.core
 
 interface Transaction {
     suspend fun <T> transaction(block: suspend () -> T): T
+    suspend fun <T> transaction(transactionLevel: Int, block: suspend () -> T): T
 }
diff --git a/src/test/kotlin/utils/TestTransaction.kt b/src/test/kotlin/utils/TestTransaction.kt
index 425372bd..f8d1832c 100644
--- a/src/test/kotlin/utils/TestTransaction.kt
+++ b/src/test/kotlin/utils/TestTransaction.kt
@@ -4,4 +4,5 @@ import dev.usbharu.hideout.service.core.Transaction
 
 object TestTransaction : Transaction {
     override suspend fun <T> transaction(block: suspend () -> T): T = block()
+    override suspend fun <T> transaction(transactionLevel: Int, block: suspend () -> T): T = block()
 }