fix(db): bug fix for add vectors

Former-commit-id: 84cfcf89843bfd79e226ef3fd8c6d9a273a1f4dc

cpp/src/db/MemManager.cpp

@@ -33,9 +33,6 @@ template<typename EngineT>
 void MemVectors<EngineT>::add(size_t n_, const float* vectors_, IDNumbers& vector_ids_) {
     _pIdGenerator->getNextIDNumbers(n_, vector_ids_);
     pEE_->AddWithIds(n_, vectors_, vector_ids_.data());
-    for(auto i=0 ; i<n_; i++) {
-        vector_ids_.push_back(i);
-    }
 }
 
 template<typename EngineT>