Add exceptions for metadata modules (#6070)

Class exception for each metadata module + handler to map on graphql
error

TODO left :
- find a way to call handler on auto-resolvers nestjs query (probably
interceptors)
- discuss what should be done for pre-hooks errors
- discuss what should be done for Unauthorized exception

packages/twenty-server/src/engine/metadata-modules/data-source/data-source.exception.ts

@@ -0,0 +1,11 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class DataSourceException extends CustomException {
+  constructor(message: string, code: DataSourceExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum DataSourceExceptionCode {
+  DATA_SOURCE_NOT_FOUND = 'DATA_SOURCE_NOT_FOUND',
+}

packages/twenty-server/src/engine/metadata-modules/data-source/data-source.service.ts

@@ -3,6 +3,11 @@ import { InjectRepository } from '@nestjs/typeorm';
 
 import { FindManyOptions, Repository } from 'typeorm';
 
+import {
+  DataSourceException,
+  DataSourceExceptionCode,
+} from 'src/engine/metadata-modules/data-source/data-source.exception';
+
 import { DataSourceEntity } from './data-source.entity';
 
 @Injectable()
@@ -58,10 +63,17 @@ export class DataSourceService {
   async getLastDataSourceMetadataFromWorkspaceIdOrFail(
     workspaceId: string,
   ): Promise<DataSourceEntity> {
-    return this.dataSourceMetadataRepository.findOneOrFail({
-      where: { workspaceId },
-      order: { createdAt: 'DESC' },
-    });
+    try {
+      return this.dataSourceMetadataRepository.findOneOrFail({
+        where: { workspaceId },
+        order: { createdAt: 'DESC' },
+      });
+    } catch (error) {
+      throw new DataSourceException(
+        `Data source not found for workspace ${workspaceId}: ${error}`,
+        DataSourceExceptionCode.DATA_SOURCE_NOT_FOUND,
+      );
+    }
   }
 
   async delete(workspaceId: string): Promise<void> {