enhance(backend): refine system account (#15530)

* wip

* wip

* wip

* Update SystemAccountService.ts

* Update 1740121393164-system-accounts.js

* Update DeleteAccountService.ts

* wip

* wip

* wip

* wip

* Update 1740121393164-system-accounts.js

* Update RepositoryModule.ts

* wip

* wip

* wip

* Update ApRendererService.ts

* wip

* wip

* Update SystemAccountService.ts

* fix tests

* fix tests

* fix tests

* fix tests

* fix tests

* fix tests

* add print logs

* ログが長すぎて出てないかもしれない

* fix migration

* refactor

* fix fed-tests

* Update RelayService.ts

* merge

* Update user.test.ts

* chore: emit log

* fix: tweak sleep duration

* fix: exit 1

* fix: wait for misskey processes to become healthy

* fix: longer sleep for user deletion

* fix: make sleep longer again

* デッドロック解消の試み

https://github.com/misskey-dev/misskey/issues/15005

* Revert "デッドロック解消の試み"

This reverts commit 266141f66f.

* wip

* Update SystemAccountService.ts

---------

Co-authored-by: おさむのひと <46447427+samunohito@users.noreply.github.com>
Co-authored-by: zyoshoka <107108195+zyoshoka@users.noreply.github.com>

packages/backend/src/core/AbuseReportService.ts

@@ -10,9 +10,9 @@ import { bindThis } from '@/decorators.js';
 import type { AbuseUserReportsRepository, MiAbuseUserReport, MiUser, UsersRepository } from '@/models/_.js';
 import { AbuseReportNotificationService } from '@/core/AbuseReportNotificationService.js';
 import { QueueService } from '@/core/QueueService.js';
-import { InstanceActorService } from '@/core/InstanceActorService.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
+import { SystemAccountService } from '@/core/SystemAccountService.js';
 import { IdService } from './IdService.js';
 
 @Injectable()
@@ -27,7 +27,7 @@ export class AbuseReportService {
 		private idService: IdService,
 		private abuseReportNotificationService: AbuseReportNotificationService,
 		private queueService: QueueService,
-		private instanceActorService: InstanceActorService,
+		private systemAccountService: SystemAccountService,
 		private apRendererService: ApRendererService,
 		private moderationLogService: ModerationLogService,
 	) {
@@ -136,7 +136,7 @@ export class AbuseReportService {
 			forwarded: true,
 		});
 
-		const actor = await this.instanceActorService.getInstanceActor();
+		const actor = await this.systemAccountService.fetch('actor');
 		const targetUser = await this.usersRepository.findOneByOrFail({ id: report.targetUserId });
 
 		const flag = this.apRendererService.renderFlag(actor, targetUser.uri!, report.comment);