fix(core): Detect DB connection aquisition deadlocks (no-changelog) (#9485)

Co-authored-by: Danny Martini <danny@n8n.io>

packages/cli/src/databases/repositories/project.repository.ts

@@ -17,8 +17,10 @@ export class ProjectRepository extends Repository<Project> {
 		});
 	}
 
-	async getPersonalProjectForUserOrFail(userId: string) {
-		return await this.findOneOrFail({
+	async getPersonalProjectForUserOrFail(userId: string, entityManager?: EntityManager) {
+		const em = entityManager ?? this.manager;
+
+		return await em.findOneOrFail(Project, {
 			where: { type: 'personal', projectRelations: { userId, role: 'project:personalOwner' } },
 		});
 	}

packages/cli/src/databases/subscribers/UserSubscriber.ts

@@ -1,12 +1,12 @@
+import { Container } from 'typedi';
 import type { EntitySubscriberInterface, UpdateEvent } from '@n8n/typeorm';
 import { EventSubscriber } from '@n8n/typeorm';
-import { User } from '../entities/User';
-import Container from 'typedi';
-import { ProjectRepository } from '../repositories/project.repository';
 import { ApplicationError, ErrorReporterProxy } from 'n8n-workflow';
 import { Logger } from '@/Logger';
-import { UserRepository } from '../repositories/user.repository';
+
 import { Project } from '../entities/Project';
+import { User } from '../entities/User';
+import { UserRepository } from '../repositories/user.repository';
 
 @EventSubscriber()
 export class UserSubscriber implements EntitySubscriberInterface<User> {
@@ -27,14 +27,17 @@ export class UserSubscriber implements EntitySubscriberInterface<User> {
 					fields.includes('email')
 				) {
 					const oldUser = event.databaseEntity;
-					const name =
+					const userEntity =
 						newUserData instanceof User
-							? newUserData.createPersonalProjectName()
-							: Container.get(UserRepository).create(newUserData).createPersonalProjectName();
+							? newUserData
+							: Container.get(UserRepository).create(newUserData);
 
-					const project = await Container.get(ProjectRepository).getPersonalProjectForUser(
-						oldUser.id,
-					);
+					const projectName = userEntity.createPersonalProjectName();
+
+					const project = await event.manager.findOneBy(Project, {
+						type: 'personal',
+						projectRelations: { userId: oldUser.id },
+					});
 
 					if (!project) {
 						// Since this is benign we're not throwing the exception. We don't
@@ -47,7 +50,7 @@ export class UserSubscriber implements EntitySubscriberInterface<User> {
 						return;
 					}
 
-					project.name = name;
+					project.name = projectName;
 
 					await event.manager.save(Project, project);
 				}