{"id":"news-feed-pull-uses-heap-merge","text":"Fan-out-on-read merges all followed users' timelines via `heapq.merge` with negated timestamps, avoiding full materialization of all posts","truth_value":"IN","source":"entries/2026/06/05/news-feed-system-news_feed.md","source_url":"","source_hash":"","justifications":[],"dependents":["hybrid-fanout-bounds-both-write-and-read-cost"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"news-feed-pull-uses-heap-merge","truth_value":"IN","reason":"premise"}]}}