發布日期：2026-06-23
年度回顧的各種總計與 52 週熱力圖，現在會自己記帳，不會再因為舊對話紀錄被砍掉而失憶了。以前它們每次都是從你電腦上現存的對話紀錄重算一次，所以只要紀錄被清掉，你的回顧就只剩下最近兩個月；現在系統每天會自己把當天的成績抄進一本專用的「帳本」裡保存下來。就算你把舊對話全砍了，帳本上的紀錄還是會保留著（最多保留 53 週，超過這個窗口的舊資料會被自動修剪掉）。就像以前老師算學期總成績是去數你抽屜裡還剩幾張考卷，現在老師會每天把分數登記在成績單上，就算考卷弄丟了分數也不會不見。
Your Year in Review totals and the 52-week heatmap now keep their own ledger and won't suffer from amnesia just because your old chat logs get cleaned up. Previously, they recalculated everything from scratch using whatever conversation logs still existed on your computer, meaning if your logs got rotated out, your review shrank to just the last two months. Now, the system copies your daily score into a dedicated "ledger" every single day. Even if you completely delete all your old chats, the records in the ledger remain untouched (up to a 53-week window, beyond which older data is automatically trimmed). It's like a teacher who used to calculate your final grade by counting how many tests you still kept in your desk — now they record your score in a gradebook every day, so even if you lose the actual test papers, your points are safe.
**Annual Wrapped and the 52-week contribution heatmap no longer lose history when source logs are pruned**: the year view recomputed everything from whatever Claude Code / Codex session logs still existed on disk, so once those logs were rotated away it could only ever show the last ~2 months. usage now persists a daily ledger (`~/.usage/year_ledger.json`) that accumulates over time — each rebuild merges the currently-available days in (overwriting a stored day only when the fresh total is at least as large, so a partially-pruned day can't shrink the record) and trims entries beyond the 53-week window. The heatmap, streaks, active days, and Wrapped totals are all computed from the merged ledger, so coverage fills toward a full year from here on.