Function remove

src/Chain/libraries/include/db/LevelMap.hpp:397–410

            }

            void remove(const Key& k, bool sync = false)
            {
                try {
                    FC_ASSERT(is_open(), "Database is not open!");

                    std::vector<char> kslice = fc::raw::pack(k);
                    ldb::Slice ks(kslice.data(), kslice.size());
                    auto status = _db->Delete(sync ? _sync_options : _write_options, ks);
                    if (!status.ok())
                    {
                        FC_THROW_EXCEPTION(level_map_failure, "database error: ${msg}", ("msg", status.ToString()));
                    }
                } FC_RETHROW_EXCEPTIONS(warn, "error removing ${key}", ("key", k));
            }

            void export_to_json(const fc::path& path)const
            {