なんかもうめっちゃ変えた

packages/backend/src/daemons/JanitorService.ts

@@ -0,0 +1,37 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { LessThan } from 'typeorm';
+import { DI } from '@/di-symbols.js';
+import { AttestationChallengesRepository } from '@/models/index.js';
+import type { OnApplicationShutdown } from '@nestjs/common';
+
+const interval = 30 * 60 * 1000;
+
+@Injectable()
+export class JanitorService implements OnApplicationShutdown {
+	#intervalId: NodeJS.Timer;
+
+	constructor(
+		@Inject(DI.attestationChallengesRepository)
+		private attestationChallengesRepository: AttestationChallengesRepository,
+	) {
+	}
+
+	/**
+	 * Clean up database occasionally
+	 */
+	public start(): void {
+		const tick = async () => {
+			await this.attestationChallengesRepository.delete({
+				createdAt: LessThan(new Date(new Date().getTime() - 5 * 60 * 1000)),
+			});
+		};
+
+		tick();
+
+		this.#intervalId = setInterval(tick, interval);
+	}
+
+	public onApplicationShutdown(signal?: string | undefined) {
+		clearInterval(this.#intervalId);
+	}
+}