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PATCH /v1/topics/:name/read upserts topic_member.last_read_at for the api key's issuing member. The chat panel calls it on mount and on every inbound SSE message (5s debounce so we don't hammer it). GET /v1/topics now returns unread per topic — counts messages newer than last_read_at and not authored by the viewer. Mesh detail page shows a clay-rounded badge next to each topic name with the count (99+ ceiling). AuthedApiKey gains issuedByMemberId so endpoints can attribute side-effects to the minting member. Required because external api keys aren't tied to a specific peer member; only dashboard- and CLI-minted keys carry one. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>