Identification cleanup (#17301)

# Introduction

following https://github.com/twentyhq/twenty/pull/17279
As we've finally identified all the syncable metadata entities, which
means they're expected to have non nullable applicationId and
universalIdentifier at pg_level we can remove previous retro comp
universalIdentifier fallbacking and update the dto too

~~This needs IdentifyRemainingEntitiesMetadataCommand and
MakeRemainingEntitiesUniversalIdentifierAndApplicationIdNotNullableMigrationCommand
to be run~~
```ts
[Nest] 197  - 01/21/2026, 3:08:35 PM     LOG [MakeRemainingEntitiesUniversalIdentifierAndApplicationIdNotNullableMigrationCommand] Successfully run MakeRemainingEntitiesUniversalIdentifierAndApplicationIdNotNullableMigrationCommand
```

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata/utils/from-create-object-input-to-flat-object-metadata-and-flat-field-metadatas-to-create.util.ts

@@ -96,8 +96,7 @@ export const fromCreateObjectInputToFlatObjectMetadataAndFlatFieldMetadatasToCre
       standardId: createObjectInput.standardId ?? null,
       standardOverrides: null,
       applicationId: workspaceCustomApplicationId,
-      universalIdentifier:
-        createObjectInput.universalIdentifier ?? objectMetadataId,
+      universalIdentifier: createObjectInput.universalIdentifier ?? v4(),
       targetTableName: 'DEPRECATED',
       workspaceId,
     };

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata/utils/from-flat-object-metadata-to-object-metadata-dto.util.ts

@@ -27,6 +27,7 @@ export const fromFlatObjectMetadataToObjectMetadataDto = (
     workspaceId,
     imageIdentifierFieldMetadataId,
     labelIdentifierFieldMetadataId,
+    applicationId,
   } = flatObjectMetadata;
 
   return {
@@ -52,5 +53,6 @@ export const fromFlatObjectMetadataToObjectMetadataDto = (
     standardOverrides: standardOverrides ?? undefined,
     shortcut: shortcut ?? undefined,
     duplicateCriteria: duplicateCriteria ?? undefined,
+    applicationId,
   };
 };

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata/utils/from-object-metadata-entity-to-flat-object-metadata.util.ts

@@ -14,11 +14,8 @@ export const fromObjectMetadataEntityToFlatObjectMetadata = (
 
   return {
     ...objectMetadataEntityWithoutRelations,
-    // TODO remove once MakeObjectMetadataUniversalIdentifierAndApplicationIdNotNullableMigrationCommand has been run once
     universalIdentifier:
-      objectMetadataEntityWithoutRelations.universalIdentifier ??
-      objectMetadataEntityWithoutRelations.standardId ??
-      objectMetadataEntityWithoutRelations.id,
+      objectMetadataEntityWithoutRelations.universalIdentifier,
     createdAt: objectMetadataEntity.createdAt.toISOString(),
     updatedAt: objectMetadataEntity.updatedAt.toISOString(),
     viewIds: objectMetadataEntity.views.map((viewEntity) => viewEntity.id),