fix tests ugh

src/services/db/personalization.db.ts

@@ -270,7 +270,7 @@ export class PersonalizationRepository {
       return newAppliances;
     } catch (error) {
       await client.query('ROLLBACK');
-      // The patch requested this specific error handling.
+      // The patch requested this specific error handling - check for foreign key violation
       if ((error as any).code === '23503') {
         throw new ForeignKeyConstraintError('Invalid appliance ID');
       }