# v0.4.1 Release Notes

> v0.4.0 -> v0.4.1

## Summary

Extract shared `core` struct to enable `Session` support, add lazy DB replay and parallel compaction for faster startup/shutdown, replace channel-based cancellation with `context.Context`, support custom storage path via `New(path)`, and sync Expire/Persist changes to JSON cache files.
<details>
<summary>翻譯</summary>
抽離共用 core 結構體支援 Session、新增延遲載入與並行 compact 加速啟動與關閉、以 context.Context 取代 channel 取消機制、支援自訂儲存路徑、修正 Expire/Persist 未同步寫入 JSON 快取檔案。
</details>

## Changes

### FEAT
- Add `Session` type sharing `core` db routing, allowing independent db index per session
- Add custom storage path support via `New(path ...string)` with directory validation

<details>
<summary>翻譯</summary>

- 新增 `Session` 類型共用 `core` db 路由，每個 session 可獨立切換 db index
- 透過 `New(path ...string)` 支援自訂儲存路徑，含目錄驗證

</details>

### FIX
- Sync Expire/ExpireAt/Persist changes to JSON cache files, matching Set/Del behavior
- Remove expired key's JSON cache file in `cleanExpired`, consistent with `Del`

<details>
<summary>翻譯</summary>

- 修正 Expire/ExpireAt/Persist 變更未同步寫入 JSON 快取檔案，與 Set/Del 行為一致
- 清除過期 key 時同步刪除對應 JSON 快取檔案，與 Del 行為一致

</details>

### REFACTOR
- Extract `core` struct with `DB()`, `Current()`, `Select()` methods shared by `Store` and `Session`
- Move all command methods from `*Store` receiver to `*core` receiver

<details>
<summary>翻譯</summary>

- 抽離 `core` 結構體，`DB()`、`Current()`、`Select()` 供 `Store` 與 `Session` 共用
- 所有命令方法從 `*Store` receiver 遷移至 `*core` receiver

</details>

### PERF
- Add lazy DB replay via `sync.Once`, only loading AOF on first access instead of all 16 at startup
- Parallelize `compact()` in `Close()` using goroutines, reducing shutdown time to slowest single DB
- Replace unbuffered `cleanCh` channel with `context.Context` cancellation, eliminating potential deadlock on shutdown

<details>
<summary>翻譯</summary>

- 透過 `sync.Once` 延遲載入 DB，首次存取才 replay AOF，啟動不再掃描全部 16 個 DB
- `Close()` 中以 goroutine 並行執行 `compact()`，關閉耗時降為最慢單一 DB
- 以 `context.Context` 取消機制取代無緩衝 channel，消除關閉時潛在 deadlock

</details>

***

## Files Changed

| File | Status | Tag |
|------|--------|-----|
| `core/store/store.go` | Modified | FEAT |
| `core/store/ttl.go` | Modified | FIX |
| `core/store/exec.go` | Modified | REFACTOR |
| `core/store/get.go` | Modified | REFACTOR |
| `core/store/set.go` | Modified | REFACTOR |
| `core/store/del.go` | Modified | REFACTOR |
| `core/store/find.go` | Modified | REFACTOR |
| `core/store/query.go` | Modified | REFACTOR |
| `core/store/keys.go` | Modified | REFACTOR |
| `core/store/incr.go` | Modified | REFACTOR |
| `core/store/incrField.go` | Modified | REFACTOR |
| `core/store/setField.go` | Modified | REFACTOR |
| `cmd/test/main.go` | Modified | UPDATE |

***

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