Tags are labels that you can add to Splitgraph images. A tag is unique per-repository.
There are two reserved tags,
latest always points to the
most recent image in a given repository. If you have checked out at least one
image in a repository,
HEAD points to the image you checked-out. If you have
not checked out an image, or you have just created the repository,
to the "empty image" (hash
You can manage image tags using the
sgr tag command.