Add label/tags to existing snapshots

[enboig]

When "forgeting" snapshots, I group them by host and paths; but now and then I change paths, so grouping fails. From now on I will label them, but I would like to be able to label my old ones.

Is this possible?

[enboig]

I cleaned my repo using "tags", as they can be added any time. Could the same functionality be added for labels?

[aawsome]

@enboig You are right, there is currently no command to set labels to existing snapshots. It can be done quite easily, is only not yet implemented.. Maybe we need to add a rustic rewrite snapshots command?

[aawsome]

With #1583, the rewrite command has been added. This currently only rewrite snapshot information, but is able to also rewrite labels. It is available in the nightly builds and will be in the next release.