feat: Complete NestJS backend scaffold — 22 modules, 39 entities, WebSocket gateway

Full backend rewrite from Rust/Axum to NestJS/TypeScript.
- 22 feature modules (auth, servers, wipes, maps, plugins, players, console,
  chat, team, notifications, settings, schedules, analytics, alerts, status,
  store, webstore, admin, setup, migration, users, licenses)
- 39 TypeORM entities matching PostgreSQL schema (12 migrations)
- Common infrastructure: JWT/RBAC guards, decorators, exception filter
- NATS service with pub/sub/request-reply
- Socket.IO WebSocket gateway with NATS bridge
- Docker: NestJS Dockerfile + updated docker-compose.yml
- Zero compile errors (npx tsc --noEmit clean)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend-nest/src/modules/alerts/alerts.service.ts

@@ -0,0 +1,65 @@
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { AlertConfig } from '../../entities/alert-config.entity';
+import { AlertHistory } from '../../entities/alert-history.entity';
+import { UpdateAlertConfigDto } from './dto/update-alert-config.dto';
+
+@Injectable()
+export class AlertsService {
+  constructor(
+    @InjectRepository(AlertConfig)
+    private readonly alertConfigRepo: Repository<AlertConfig>,
+    @InjectRepository(AlertHistory)
+    private readonly alertHistoryRepo: Repository<AlertHistory>,
+  ) {}
+
+  async getConfig(licenseId: string): Promise<AlertConfig> {
+    let config = await this.alertConfigRepo.findOne({
+      where: { license_id: licenseId },
+    });
+
+    if (!config) {
+      // Create default config if not exists
+      config = this.alertConfigRepo.create({
+        license_id: licenseId,
+        population_drop_enabled: true,
+        population_drop_threshold_percent: 30,
+        fps_degradation_enabled: true,
+        fps_threshold: 30,
+        notify_discord: true,
+        notify_pushbullet: false,
+        notify_email: false,
+      });
+      await this.alertConfigRepo.save(config);
+    }
+
+    return config;
+  }
+
+  async updateConfig(licenseId: string, dto: UpdateAlertConfigDto): Promise<AlertConfig> {
+    let config = await this.alertConfigRepo.findOne({
+      where: { license_id: licenseId },
+    });
+
+    if (!config) {
+      config = this.alertConfigRepo.create({
+        license_id: licenseId,
+        ...dto,
+      });
+    } else {
+      Object.assign(config, dto);
+      config.updated_at = new Date();
+    }
+
+    return this.alertConfigRepo.save(config);
+  }
+
+  async getHistory(licenseId: string, limit: number = 50): Promise<AlertHistory[]> {
+    return this.alertHistoryRepo.find({
+      where: { license_id: licenseId },
+      order: { triggered_at: 'DESC' },
+      take: limit,
+    });
+  }
+}