Merge pull request #2679 from HugoMichard/patch-1

docs(database): fix TypeScript error for UsersService

Author: kamilmysliwiec

content/techniques/sql.md

@@ -180,11 +180,11 @@ export class UsersService {
     return this.usersRepository.find();
   }
 
-  findOne(id: number): Promise<User> {
+  findOne(id: number): Promise<User | null> {
     return this.usersRepository.findOneBy({ id });
   }
 
-  async remove(id: string): Promise<void> {
+  async remove(id: number): Promise<void> {
     await this.usersRepository.delete(id);
   }
 }