added explicit lookup_fields to entity types

src/database/executors/mock.rs

@@ -85,6 +85,10 @@ impl DatabaseExecutor for MockExecutor {
     Ok("2026-03-10T00:00:00Z".to_string())
   }
 
+  fn is_mock(&self) -> bool {
+    true
+  }
+
   #[cfg(test)]
   fn get_queries(&self) -> Vec<String> {
     MOCK_STATE.with(|state| state.borrow().captured_queries.clone())