Indicates that the file is permanent and should not be deleted.
Temporary files older than the system.file.temporary_maximum_age configuration value will be, if clean-up not disabled, removed during cron runs, but permanent files will not be removed during the file garbage collection process.
const FILE_STATUS_PERMANENT = 1;
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https://api.drupal.org/api/drupal/core!includes!file.inc/constant/FILE_STATUS_PERMANENT/8.1.x