How to: periodic rescan
filesystem monitoring;  if copyparty is not the only software doing stuff on your filesystem, you may want to enable periodic rescans to keep the index up to date

argument `--re-maxage 60` will rescan all volumes every 60 sec, same as volflag `:c,scan=60` to specify it per-volume

uploads are disabled while a rescan is happening, so rescans will be delayed by `--db-act` (default 10 sec) when there is write-activity going on (uploads, renames, ...)

note: folder-thumbnails are selected during filesystem indexing, so periodic rescans can be used to keep them accurate as images are uploaded/deleted (or manually do a rescan with the `reload` button in the controlpanel)

config file example:

```yaml
[global]
  re-maxage: 3600

[/pics]
  /mnt/nas/pics
  flags:
    scan: 900
```