test(guild): add concurrent message write verification and fix duplicate messageId index

Fabric.Backend.Guild/src/entities/message.entity.ts

@@ -9,7 +9,6 @@ export class Message {
   @PrimaryGeneratedColumn('uuid')
   id!: string;
 
-  @Index()
   @Column({ type: 'varchar', length: 80, unique: true })
   messageId!: string;
 

Fabric.Backend.Guild/src/health.integration.spec.ts

@@ -2,6 +2,8 @@ import { INestApplication } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
 import request from 'supertest';
 import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { DataSource } from 'typeorm';
+import { Channel } from './entities/channel.entity';
 
 process.env.DB_HOST = '127.0.0.1';
 process.env.DB_PORT = '3308';
@@ -13,6 +15,7 @@ process.env.FABRIC_API_KEY = 'test-api-key';
 
 describe('guild integration (mysql + api)', () => {
   let app: INestApplication;
+  let dataSource: DataSource;
 
   beforeAll(async () => {
     const { AppModule } = await import('./app.module');
@@ -23,6 +26,9 @@ describe('guild integration (mysql + api)', () => {
     app = moduleRef.createNestApplication();
     app.setGlobalPrefix('api');
     await app.init();
+    dataSource = app.get(DataSource);
+    await dataSource.dropDatabase();
+    await dataSource.synchronize();
   }, 30000);
 
   afterAll(async () => {
@@ -40,4 +46,32 @@ describe('guild integration (mysql + api)', () => {
     const res = await request(app.getHttpServer()).get('/api/channels/non-exist/messages');
     expect(res.status).toBe(401);
   });
+
+  it('supports concurrent message writes with continuous seq', async () => {
+    const channelRepo = dataSource.getRepository(Channel);
+    const channel = await channelRepo.save(
+      channelRepo.create({
+        guildId: 'test-guild',
+        name: `concurrency-${Date.now()}`,
+        kind: 'text',
+        isPrivate: false,
+        lastSeq: 0,
+      }),
+    );
+
+    const concurrent = 10;
+    const tasks = Array.from({ length: concurrent }, (_, i) =>
+      request(app.getHttpServer())
+        .post(`/api/channels/${channel.id}/messages`)
+        .set('x-api-key', 'test-api-key')
+        .send({ content: `hello-${i + 1}`, authorUserId: 'u1' }),
+    );
+
+    const responses = await Promise.all(tasks);
+    const seqs = responses.map((r) => r.body.seq).sort((a, b) => a - b);
+
+    expect(responses.every((r) => r.status === 201)).toBe(true);
+    expect(new Set(seqs).size).toBe(concurrent);
+    expect(seqs).toEqual(Array.from({ length: concurrent }, (_, i) => i + 1));
+  });
 });