perf(backend): createdAtをidから取得するように & 無駄なDateインスタンスの生成を避けるように

packages/backend/src/server/api/endpoints/invite/limit.ts

@@ -9,6 +9,7 @@ import { Endpoint } from '@/server/api/endpoint-base.js';
 import type { RegistrationTicketsRepository } from '@/models/_.js';
 import { RoleService } from '@/core/RoleService.js';
 import { DI } from '@/di-symbols.js';
+import { IdService } from '@/core/IdService.js';
 
 export const meta = {
 	tags: ['meta'],
@@ -41,12 +42,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private registrationTicketsRepository: RegistrationTicketsRepository,
 
 		private roleService: RoleService,
+		private idService: IdService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const policies = await this.roleService.getUserPolicies(me.id);
 
 			const count = policies.inviteLimit ? await this.registrationTicketsRepository.countBy({
-				createdAt: MoreThan(new Date(Date.now() - (policies.inviteExpirationTime * 60 * 1000))),
+				id: MoreThan(this.idService.gen(Date.now() - (policies.inviteExpirationTime * 60 * 1000))),
 				createdById: me.id,
 			}) : null;