diff --git a/src/api/model/ApiObject.kt b/src/api/model/ApiObject.kt
index 6fda350..322cd60 100644
--- a/src/api/model/ApiObject.kt
+++ b/src/api/model/ApiObject.kt
@@ -1,8 +1,9 @@
 package com.kmalbz.api.model
 
 import com.google.gson.annotations.SerializedName
+import java.util.*
 
 data class ApiObject(
-    @SerializedName("tag") val tag: String,
+    @SerializedName("tag") val tag: UUID,
     @SerializedName("probability") val probability: Double
 )
\ No newline at end of file
diff --git a/src/api/route/OutputServiceRDBServer.kt b/src/api/route/OutputServiceRDBServer.kt
index ff756bd..9ac9d69 100644
--- a/src/api/route/OutputServiceRDBServer.kt
+++ b/src/api/route/OutputServiceRDBServer.kt
@@ -9,6 +9,7 @@ import io.ktor.routing.get
 import org.koin.ktor.ext.inject
 import java.time.LocalDate
 import java.time.format.DateTimeFormatter
+import java.util.*
 
 /**
  * Output Service - RDB
@@ -63,7 +64,7 @@ class OutputServiceRDBServer {
 
         get("/output/{tagID}") {
             val tagID = call.parameters["tagID"] ?: error(HttpStatusCode.NotAcceptable)
-            val resultObject = resultObjectService.getResultObjectbyTag(tagID) ?: call.respond(HttpStatusCode.NotFound)
+            val resultObject = resultObjectService.getResultObjectbyTag(UUID.fromString(tagID)) ?: call.respond(HttpStatusCode.NotFound)
 
             call.respond(resultObject)
         }
diff --git a/src/database/dao/ResultObjects.kt b/src/database/dao/ResultObjects.kt
index b27397f..ae2df3b 100644
--- a/src/database/dao/ResultObjects.kt
+++ b/src/database/dao/ResultObjects.kt
@@ -4,9 +4,10 @@ import org.jetbrains.exposed.dao.id.IntIdTable
 import org.jetbrains.exposed.sql.*
 import org.jetbrains.exposed.sql.`java-time`.date
 import java.time.LocalDate
+import java.util.*
 
 object ResultObjects : IntIdTable() {
-    val tag: Column<String> = varchar("tag",32)
+    val tag: Column<UUID> = uuid("tag")
     val date: Column<LocalDate> = date("date").default(LocalDate.now())
     val probability: Column<Double> = double("probability")
     override val primaryKey = PrimaryKey(id, name = "PK_ResultObject_Id")
diff --git a/src/database/service/IResultObjectService.kt b/src/database/service/IResultObjectService.kt
index d612f78..a59c9bc 100644
--- a/src/database/service/IResultObjectService.kt
+++ b/src/database/service/IResultObjectService.kt
@@ -2,11 +2,12 @@ package com.kmalbz.database.service
 
 import com.kmalbz.api.model.ApiObject
 import java.time.LocalDate
+import java.util.*
 
 interface IResultObjectService{
     fun addOne(apiObject: ApiObject)
     suspend fun getAllResultObjects(): List<ApiObject>
-    suspend fun getResultObjectbyTag(tag: String): ApiObject?
+    suspend fun getResultObjectbyTag(tag: UUID): ApiObject?
     suspend fun getResultObjectbyDate(date: LocalDate): List<ApiObject>?
     suspend fun getResultObjectbeforeDate(date: LocalDate): List<ApiObject>?
     suspend fun getResultObjectafterDate(date: LocalDate): List<ApiObject>?
diff --git a/src/database/service/ResultObjectService.kt b/src/database/service/ResultObjectService.kt
index 6765e67..d67bd7f 100644
--- a/src/database/service/ResultObjectService.kt
+++ b/src/database/service/ResultObjectService.kt
@@ -9,6 +9,7 @@ import org.jetbrains.exposed.sql.select
 import org.jetbrains.exposed.sql.selectAll
 import org.jetbrains.exposed.sql.transactions.transaction
 import java.time.LocalDate
+import java.util.*
 
 
 class ResultObjectService : IResultObjectService {
@@ -26,7 +27,7 @@ class ResultObjectService : IResultObjectService {
         ResultObjects.selectAll().map { toResultObject(it) }
     }
 
-    override suspend fun getResultObjectbyTag(tag: String): ApiObject? = dbQuery {
+    override suspend fun getResultObjectbyTag(tag: UUID): ApiObject? = dbQuery {
         ResultObjects.select {
             (ResultObjects.tag eq tag)
         }.mapNotNull { toResultObject(it) }