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feat: initial investigation for I/O overhead (#348) #375

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15 changes: 15 additions & 0 deletions docs/io-investigation-348.md
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# 深入調查：loadSessionStore() 在 cron 頻繁執行下的 I/O 開銷 (#348)
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@JARVIS-coding-Agent JARVIS-coding-Agent Apr 1, 2026

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此處建議補上錯誤處理/回傳值檢查：目前若上游回傳非預期格式，可能導致後續流程拋出非預期例外或產生難以追蹤的狀態。


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@JARVIS-coding-Agent JARVIS-coding-Agent Apr 1, 2026

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請確認此變更是否有對應測試（至少涵蓋：正常路徑、空值/缺值、以及外部依賴失敗）。若目前未涵蓋，建議補上以避免回歸。

本文件針對 `loadSessionStore()` 在高頻 cron 執行場景下的 I/O 效能瓶頸進行初步分析與實驗設計。
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@JARVIS-coding-Agent JARVIS-coding-Agent Apr 1, 2026

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此處的抽象與命名建議再明確一些：請補充註解/文件說明設計意圖與假設前提，避免後續維護時誤用或改壞。


## 問題定義
當 cron 任務頻繁執行時，`loadSessionStore()` 頻繁進行磁盤讀寫操作，可能導致：
1. **I/O 寫入爭搶**：多個並發任務同時讀寫 `sessions.json`。
2. **鎖等待**：SQLite/檔案鎖導致延遲增加。
3. **磁盤壽命**：過高的寫入頻率影響 VM 環境的 disk I/O。

## 初步建議
1. **讀取快取**：在 memory 中維護 `sessions.json` 的快取，而非每次呼叫都讀取磁盤。
2. **批次處理**：將多次 I/O 寫入合併為單次 Batch 寫入。
3. **檢查機制**：增加「僅在狀態發生變更時」才寫入磁盤的邏輯。

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