Warning, just tested with olddata.rrd from Freifunk Bremen generated by detailed-rrds branch of [ffmap-backend](https://github.com/ffnord/ffmap-backend/tree/detailed-rrds)
```
Usage:
yanic import <file.rrd> [flags]
Examples:
yanic import --config /etc/yanic.toml olddata.rrd
Flags:
-c, --config string Path to configuration file (default "config.toml")
-h, --help help for import
```
### Firstseen
To import firstseen values there is a little script in contrib: