Method checkpoint

src/storage/overflow_file.cpp:141–145

}

void OverflowFileHandle::checkpoint() {
    for (auto& [pageIndex, page] : pageWriteCache) {
        overflowFile.writePageToDisk(pageIndex, page.buffer->getData(), page.newPage);
    }
}

void OverflowFileHandle::reclaimStorage(PageAllocator& pageAllocator) {
    if (startPageIdx == INVALID_PAGE_IDX) {