diff --git a/packages/backend/src/core/WebhookService.ts b/packages/backend/src/core/WebhookService.ts
index 36110490a0..30caa9682c 100644
--- a/packages/backend/src/core/WebhookService.ts
+++ b/packages/backend/src/core/WebhookService.ts
@@ -44,16 +44,25 @@ export class WebhookService implements OnApplicationShutdown {
 			switch (type) {
 				case 'webhookCreated':
 					if (body.active) {
-						this.webhooks.push(body);
+						this.webhooks.push({
+							...body,
+							createdAt: new Date(body.createdAt),
+						});
 					}
 					break;
 				case 'webhookUpdated':
 					if (body.active) {
 						const i = this.webhooks.findIndex(a => a.id === body.id);
 						if (i > -1) {
-							this.webhooks[i] = body;
+							this.webhooks[i] = {
+								...body,
+								createdAt: new Date(body.createdAt),
+							};
 						} else {
-							this.webhooks.push(body);
+							this.webhooks.push({
+								...body,
+								createdAt: new Date(body.createdAt),
+							});
 						}
 					} else {
 						this.webhooks = this.webhooks.filter(a => a.id !== body.id);
diff --git a/packages/backend/src/core/entities/NotificationEntityService.ts b/packages/backend/src/core/entities/NotificationEntityService.ts
index ded1b512a1..4140b3f35e 100644
--- a/packages/backend/src/core/entities/NotificationEntityService.ts
+++ b/packages/backend/src/core/entities/NotificationEntityService.ts
@@ -2,7 +2,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import { In } from 'typeorm';
 import { ModuleRef } from '@nestjs/core';
 import { DI } from '@/di-symbols.js';
-import type { AccessTokensRepository, NoteReactionsRepository, NotificationsRepository } from '@/models/index.js';
+import type { AccessTokensRepository, NoteReactionsRepository, NotificationsRepository, User } from '@/models/index.js';
 import { awaitAll } from '@/misc/prelude/await-all.js';
 import type { Notification } from '@/models/entities/Notification.js';
 import type { NoteReaction } from '@/models/entities/NoteReaction.js';