diff --git a/packages/engine-http/src/content/ContentApiMiddlewareFactory.ts b/packages/engine-http/src/content/ContentApiMiddlewareFactory.ts
index bfd335e5..05ee96d6 100644
--- a/packages/engine-http/src/content/ContentApiMiddlewareFactory.ts
+++ b/packages/engine-http/src/content/ContentApiMiddlewareFactory.ts
@@ -53,7 +53,7 @@ export class ContentApiMiddlewareFactory {
 				request,
 				timer,
 				systemDatabase,
-				stageSlug: stage.slug,
+				stageId: stage.id,
 			})
 			if (notModifiedRes?.isModified === false) {
 				response.status = 304
diff --git a/packages/engine-http/src/content/NotModifiedChecker.ts b/packages/engine-http/src/content/NotModifiedChecker.ts
index e404ab50..5b1afaa3 100644
--- a/packages/engine-http/src/content/NotModifiedChecker.ts
+++ b/packages/engine-http/src/content/NotModifiedChecker.ts
@@ -11,11 +11,11 @@ export interface NotModifiedCheckResult {
 }
 
 export class NotModifiedChecker {
-	public async checkNotModified({ request, timer, systemDatabase, stageSlug }: {
+	public async checkNotModified({ request, timer, systemDatabase, stageId }: {
 		request: Request
 		timer: Timer
 		systemDatabase: DatabaseContext
-		stageSlug: string
+		stageId: string
 	}): Promise<NotModifiedCheckResult | null> {
 		if (request.headers[NotModifiedHeaderName] === undefined) {
 			return null
@@ -28,7 +28,7 @@ export class NotModifiedChecker {
 		}
 		const latestRef = await timer('NotModifiedCheck', () => {
 			const queryHandler = systemDatabase.queryHandler
-			return queryHandler.fetch(new LatestTransactionIdByStageQuery(stageSlug))
+			return queryHandler.fetch(new LatestTransactionIdByStageQuery(stageId))
 		})
 
 		return {
diff --git a/packages/engine-system-api/src/model/queries/events/LatestTransactionIdByStageQuery.ts b/packages/engine-system-api/src/model/queries/events/LatestTransactionIdByStageQuery.ts
index 1840b529..e9fa44f5 100644
--- a/packages/engine-system-api/src/model/queries/events/LatestTransactionIdByStageQuery.ts
+++ b/packages/engine-system-api/src/model/queries/events/LatestTransactionIdByStageQuery.ts
@@ -1,34 +1,20 @@
-import { DatabaseQuery, DatabaseQueryable } from '@contember/database'
+import { DatabaseQuery, DatabaseQueryable, SelectBuilder } from '@contember/database'
 import { ImplementationException } from '../../../utils'
 
 export class LatestTransactionIdByStageQuery extends DatabaseQuery<string> {
-	constructor(private readonly stageSlug: string) {
+	constructor(private readonly stageId: string) {
 		super()
 	}
 
 	async fetch(queryable: DatabaseQueryable): Promise<string> {
-		const stageId = (
-			await queryable.db.query<{ id: string }>(
-				`
-				SELECT id
-				FROM system.stage
-				WHERE slug = ?
-				`,
-				[this.stageSlug],
-			)
-		).rows[0].id
-		const rows = (
-			await queryable.db.query<{ transaction_id: string }>(
-				`
-				SELECT transaction_id
-				FROM system.stage_transaction
-				WHERE stage_id = ?
-				ORDER BY applied_at DESC
-				LIMIT 1
-				`,
-				[stageId],
-			)
-		).rows
+		const rows = await SelectBuilder.create<{ transaction_id: string }>()
+			.from('stage_transaction')
+			.select('transaction_id')
+			.where({ stage_id: this.stageId })
+			.orderBy('applied_at', 'desc')
+			.limit(1)
+			.getResult(queryable.db)
+
 		if (rows.length !== 1) {
 			throw new ImplementationException()
 		}