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Part of the social-feature backlog (follow, comments, reactions, ratings, feed, threading) audited earlier — see conversation. - notifications table: follow/comment/reply/reaction/rating events, replaces the fully-dead feed_items table (feed_item_type enum existed but had zero references anywhere in the codebase). - Bell UI in the nav with unread badge, mark-all-read, 30s poll. - Rate limiting on comment posting (20/min), follow/unfollow (30/min), and comment reactions (60/min) — previously unthrottled. - /recipes/[id] queried by (id, authorId=session.user) only, so any recipe not owned by the viewer 404'd regardless of visibility. Widen the query to include public/unlisted recipes and gate the owner-only actions (edit, delete, version history, translate, AI content generation) behind an isOwner check. - user_follows had no primary key/unique constraint, so the follow route's onConflictDoNothing() was a silent no-op — concurrent follow clicks could insert duplicate rows and inflate follower counts. Add a composite primary key on (follower_id, following_id). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>