feat(server): add generate title cron resolver (#13189)

fix AI-350

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added a new option to manually trigger the generation of missing
session titles via a GraphQL query.

* **Improvements**
* The process for generating missing session titles now considers all
eligible sessions, without limiting the number processed at a time.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/__tests__/__snapshots__/copilot.spec.ts.md

@@ -431,9 +431,7 @@ Generated by [AVA](https://avajs.dev).
       ],
       modelCalls: [
         {
-          args: [
-            100,
-          ],
+          args: [],
         },
       ],
     }

packages/backend/server/src/__tests__/models/copilot-session.spec.ts

@@ -1078,7 +1078,7 @@ test('should get sessions for title generation correctly', async t => {
     })
   );
 
-  const result = await copilotSession.toBeGenerateTitle(10);
+  const result = await copilotSession.toBeGenerateTitle();
 
   t.snapshot(
     {

packages/backend/server/src/models/copilot-session.ts

@@ -613,7 +613,7 @@ export class CopilotSessionModel extends BaseModel {
   }
 
   @Transactional()
-  async toBeGenerateTitle(take: number) {
+  async toBeGenerateTitle() {
     const sessions = await this.db.aiSession
       .findMany({
         where: {
@@ -628,7 +628,6 @@ export class CopilotSessionModel extends BaseModel {
           // count assistant messages
           _count: { select: { messages: { where: { role: 'assistant' } } } },
         },
-        take,
         orderBy: { updatedAt: 'desc' },
       })
       .then(s => s.filter(s => s._count.messages > 0));

packages/backend/server/src/plugins/copilot/cron.ts

@@ -11,8 +11,6 @@ declare global {
   }
 }
 
-const GENERATE_TITLES_BATCH_SIZE = 100;
-
 @Injectable()
 export class CopilotCronJobs {
   private readonly logger = new Logger(CopilotCronJobs.name);
@@ -37,6 +35,14 @@ export class CopilotCronJobs {
     );
   }
 
+  async triggerGenerateMissingTitles() {
+    await this.jobs.add(
+      'copilot.session.generateMissingTitles',
+      {},
+      { jobId: 'trigger-copilot-generate-missing-titles' }
+    );
+  }
+
   @OnJob('copilot.session.cleanupEmptySessions')
   async cleanupEmptySessions() {
     const { removed, cleaned } =
@@ -51,9 +57,7 @@ export class CopilotCronJobs {
 
   @OnJob('copilot.session.generateMissingTitles')
   async generateMissingTitles() {
-    const sessions = await this.models.copilotSession.toBeGenerateTitle(
-      GENERATE_TITLES_BATCH_SIZE
-    );
+    const sessions = await this.models.copilotSession.toBeGenerateTitle();
 
     for (const session of sessions) {
       await this.jobs.add('copilot.session.generateTitle', {

packages/backend/server/src/plugins/copilot/resolver.ts

@@ -37,6 +37,7 @@ import { Admin } from '../../core/common';
 import { AccessController } from '../../core/permission';
 import { UserType } from '../../core/user';
 import type { ListSessionOptions, UpdateChatSession } from '../../models';
+import { CopilotCronJobs } from './cron';
 import { PromptService } from './prompt';
 import { PromptMessage, StreamObject } from './providers';
 import { ChatSessionService } from './session';
@@ -773,7 +774,18 @@ class CreateCopilotPromptInput {
 @Admin()
 @Resolver(() => String)
 export class PromptsManagementResolver {
-  constructor(private readonly promptService: PromptService) {}
+  constructor(
+    private readonly cron: CopilotCronJobs,
+    private readonly promptService: PromptService
+  ) {}
+
+  @Query(() => Boolean, {
+    description: 'Trigger generate missing titles cron job',
+  })
+  async triggerGenerateTitleCron() {
+    await this.cron.triggerGenerateMissingTitles();
+    return true;
+  }
 
   @Query(() => [CopilotPromptType], {
     description: 'List all copilot prompts',