Update dataset version
Tag a dataset version.
Points the tag at the version given by as_of, creating the tag or moving it if the dataset already has it. Other tags are unchanged. Requires permission to update datasets. Returns the version’s time and all of its tags. Returns 400 if the tag is latest, and 404 if the dataset or the as_of tag does not exist.
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The version to tag: an ISO 8601 timestamp, or the name of an existing tag on this dataset (latest resolves to the most recent example change, and returns 404 for a dataset with no examples). A value that does not parse as a timestamp is treated as a tag name, and an unknown tag name returns 404. Timestamps are not checked against the dataset history: the tag covers every example change made on or before that time, so a future time keeps picking up new changes until it passes. Use the exact as_of of an existing version, since looking up a version by tag returns 404 when the tag's time does not match a version.
The tag to set. If the dataset already has this tag, it is moved to the new version. The tag latest is reserved and returns 400.

