Follow System

Overview

Users can follow/unfollow other users. Follower and following counts are denormalized on the User model for O(1) reads.

Implementation

• Toggle — single mutation handles both follow and unfollow
• Unique index — compound index on (follower, following) prevents duplicates
• Counter sync — followerCount and followingCount are incremented/decremented atomically on follow/unfollow
• Cursor pagination — followers/following lists are paginated for scalability

Technical Details

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