Remove DataSourceService and clean up datasource migration logic (#19532)

## Summary

- **Drop the `objectMetadata.dataSourceId` foreign key and index** via a
1-22 fast instance command — column kept nullable for data preservation
- **Delete `DataSourceService`, `DataSourceModule`, and
`DataSourceException`** — all code now uses `workspace.databaseSchema`
directly
- **Remove `IS_DATASOURCE_MIGRATED` feature flag** from default flags
and all branching logic
- **Simplify workspace/object creation pipelines** —
`WorkspaceManagerService`, `DevSeederService`, and the object creation
action handler no longer route through `DataSourceService`
- **Keep `DataSourceEntity` and the `dataSource` table** for historical
data — entity stripped of all ORM relations

packages/twenty-server/src/engine/workspace-manager/workspace-migration/constant/default-feature-flags.ts

@@ -1,5 +1,3 @@
 import { FeatureFlagKey } from 'twenty-shared/types';
 
-export const DEFAULT_FEATURE_FLAGS = [
-  FeatureFlagKey.IS_DATASOURCE_MIGRATED,
-] as const satisfies FeatureFlagKey[];
+export const DEFAULT_FEATURE_FLAGS = [] as const satisfies FeatureFlagKey[];

packages/twenty-server/src/engine/workspace-manager/workspace-migration/workspace-migration-runner/action-handlers/object/services/create-object-action-handler.service.ts

@@ -4,7 +4,6 @@ import { v4 } from 'uuid';
 
 import { WorkspaceMigrationRunnerActionHandler } from 'src/engine/workspace-manager/workspace-migration/workspace-migration-runner/interfaces/workspace-migration-runner-action-handler-service.interface';
 
-import { DataSourceEntity } from 'src/engine/metadata-modules/data-source/data-source.entity';
 import { ALL_METADATA_ENTITY_BY_METADATA_NAME } from 'src/engine/metadata-modules/flat-entity/constant/all-metadata-entity-by-metadata-name.constant';
 import { isCompositeFlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/utils/is-composite-flat-field-metadata.util';
 import { isEnumFlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/utils/is-enum-flat-field-metadata.util';
@@ -42,19 +41,9 @@ export class CreateObjectActionHandlerService extends WorkspaceMigrationRunnerAc
   override async transpileUniversalActionToFlatAction(
     context: WorkspaceMigrationActionRunnerArgs<UniversalCreateObjectAction>,
   ): Promise<FlatCreateObjectAction> {
-    const { action, queryRunner, workspaceId, allFlatEntityMaps } = context;
+    const { action, workspaceId, allFlatEntityMaps } = context;
     const { fieldIdByUniversalIdentifier, id: providedObjectId } = action;
 
-    const dataSourceRepository =
-      queryRunner.manager.getRepository<DataSourceEntity>(DataSourceEntity);
-
-    const lastDataSourceMetadata = await dataSourceRepository.findOneOrFail({
-      where: {
-        workspaceId,
-      },
-      order: { createdAt: 'DESC' },
-    });
-
     const allFieldIdToBeCreatedInActionByUniversalIdentifierMap = new Map<
       string,
       string
@@ -77,7 +66,6 @@ export class CreateObjectActionHandlerService extends WorkspaceMigrationRunnerAc
         allFieldIdToBeCreatedInActionByUniversalIdentifierMap,
         allFlatEntityMaps,
         context,
-        dataSourceId: lastDataSourceMetadata.id,
         generatedId: providedObjectId ?? v4(),
         universalFlatObjectMetadata: action.flatEntity,
       });

packages/twenty-server/src/engine/workspace-manager/workspace-migration/workspace-migration-runner/action-handlers/object/services/utils/from-universal-flat-object-metadata-to-flat-object-metadata.util.ts

@@ -20,7 +20,6 @@ export type FromUniversalFlatObjectMetadataToFlatObjectMetadataArgs = {
     WorkspaceMigrationActionRunnerArgs<AllUniversalWorkspaceMigrationAction>,
     'workspaceId' | 'flatApplication'
   >;
-  dataSourceId: string;
 };
 
 const findFieldMetadataIdInCreateObjectContext = ({
@@ -49,7 +48,6 @@ const findFieldMetadataIdInCreateObjectContext = ({
 
 export const fromUniversalFlatObjectMetadataToFlatObjectMetadata = ({
   universalFlatObjectMetadata,
-  dataSourceId,
   generatedId,
   allFlatEntityMaps,
   allFieldIdToBeCreatedInActionByUniversalIdentifierMap,
@@ -57,9 +55,7 @@ export const fromUniversalFlatObjectMetadataToFlatObjectMetadata = ({
     flatApplication: { id: applicationId },
     workspaceId,
   },
-}: FromUniversalFlatObjectMetadataToFlatObjectMetadataArgs): FlatObjectMetadata & {
-  dataSourceId: string;
-} => {
+}: FromUniversalFlatObjectMetadataToFlatObjectMetadataArgs): FlatObjectMetadata => {
   const {
     universalIdentifier,
     applicationUniversalIdentifier,
@@ -107,7 +103,6 @@ export const fromUniversalFlatObjectMetadataToFlatObjectMetadata = ({
 
   return {
     ...restProperties,
-    dataSourceId,
     id: generatedId,
     workspaceId,
     applicationId,

packages/twenty-server/src/engine/workspace-manager/workspace-migration/workspace-migration-runner/workspace-migration-runner.module.ts

@@ -6,7 +6,6 @@ import { WorkspaceIteratorModule } from 'src/database/commands/command-runners/w
 import { TypeORMModule } from 'src/database/typeorm/typeorm.module';
 import { FeatureFlagModule } from 'src/engine/core-modules/feature-flag/feature-flag.module';
 import { WorkspaceEntity } from 'src/engine/core-modules/workspace/workspace.entity';
-import { DataSourceModule } from 'src/engine/metadata-modules/data-source/data-source.module';
 import { WorkspaceManyOrAllFlatEntityMapsCacheModule } from 'src/engine/metadata-modules/flat-entity/services/workspace-many-or-all-flat-entity-maps-cache.module';
 import { WorkspaceMetadataVersionModule } from 'src/engine/metadata-modules/workspace-metadata-version/workspace-metadata-version.module';
 import { WorkspaceCacheStorageModule } from 'src/engine/workspace-cache-storage/workspace-cache-storage.module';
@@ -20,7 +19,6 @@ import { WorkspaceMigrationRunnerService } from 'src/engine/workspace-manager/wo
   imports: [
     FeatureFlagModule,
     TypeORMModule,
-    DataSourceModule,
     WorkspaceMetadataVersionModule,
     WorkspaceSchemaMigrationRunnerActionHandlersModule,
     WorkspaceManyOrAllFlatEntityMapsCacheModule,