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7d3cbf1023
Config.update_config() applies submitted options to the main configuration file via configparser read-modify-write: unknown options are preserved, null removes an option, the merged view of all files is validated as ServerConfig before anything is written (a bad file would kill the FileWatcher polling loop), and the write is atomic (.tmp + os.replace, mode 0600). Options whose effective value is owned by a later configuration file raise ConfigConflictError instead of writing a no-op. The reload logic is factored into reload_and_notify() and the file watcher callback is exception-guarded so polling never dies.