{"id":"nearby-friends-update-location-skips-grid-filtering","text":"`update_location` iterates all friends and computes haversine for each (O(friends)), while `get_nearby_friends` uses the grid index to narrow candidates before distance checks","truth_value":"OUT","source":"entries/2026/06/05/nearby-friends-nearby_friends.md","source_url":"","source_hash":"","justifications":[],"dependents":["nearby-friends-visibility-scales"],"metadata":{"_retracted":true},"created_at":"","updated_at":"2026-06-17T14:30:23+00:00","reviewed_at":"","verified_at":"","retracted_at":"2026-06-17T14:30:23+00:00","explanation":{"steps":[{"node":"nearby-friends-update-location-skips-grid-filtering","truth_value":"OUT","reason":"retracted premise"}]}}