The user page a superuser opens from the user list has an API Tokens
tab: the user's tokens with their name, first characters, creation,
expiry and last use, and a delete button for one that may have leaked.
The token itself is never shown; only its digest is kept.
The delete reuses the owner's delete view with the user's id; only a
superuser may name another user. The confirmation and the log row say
whose token it was ("API token backup of alice"); the owner's own
confirmation now reads "Delete "API token backup"?" too. The profile
and the user page share one token table, and one script that opens a
tab named in the address (#apitokens).
