{"id":"chat-read-cursors-monotonic","text":"`mark_read` only advances the read cursor; it silently ignores attempts to set a lower sequence number, preventing regression.","truth_value":"IN","source":"entries/2026/06/05/chat-system-chat_system.md","source_url":"","source_hash":"","justifications":[],"dependents":["chat-monotonic-read-progress"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"chat-read-cursors-monotonic","truth_value":"IN","reason":"premise"}]}}