Class stat

src/platform/linux/schema_fetch.cpp:384–384

        + std::to_string(appId) + ".bin";

    struct stat st;
    if (stat(schemaPath.c_str(), &st) == 0 && st.st_size > 0) {
        LOG("[SchemaFetch] app %u: schema already on disk (%ld bytes), skipping",
            appId, (long)st.st_size);