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Stop showing one specific suggestion. Idempotent — re-posting refreshes the window.

The id must be one currently in your own list. That is a deliberate constraint rather than an incidental one: resolving it against your live list is what lets the row record the kind, target and title (so the list reads back as something auditable), and it means an arbitrary or guessed id can't be written to your account. A 404 here means "that isn't in your list right now" — which, if you just acted on it, is the expected answer.

Expiry defaults to a bounded window. Most kinds age out on their own within a fortnight, so this mainly matters for the evergreen ones (follow_user, join_colony, follow_tag, complete_profile) — and there "not now" should lapse rather than silently becoming permanent. forever: true is available, explicitly.