Update the tags assigned to a Data Room participant, identified by email. Two mutually exclusive modes:

Replacement - provide tagIds: the participant ends up with exactly those tags, and an empty list clears all of their tags. Ideal for sync integrations that mirror a source of truth.

Incremental - provide addTagIds and/or removeTagIds: the listed tags are added to / removed from the participant's current set without touching other tags. Adding an already-assigned tag and removing an unassigned tag are no-ops. Ideal when multiple systems each manage their own tags.

Providing both modes, omitting all three fields, or listing the same tag in addTagIds and removeTagIds responds with 400. Empty addTagIds/removeTagIds lists are accepted and simply change nothing.

Tags can be assigned to participants who have been invited but have not yet joined the Data Room. Responds with 404 if no participant with that email exists in the Data Room, and 400 if any referenced tag is not a tag of the Data Room.