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SmileQWQ 2e03db1c02 perf: trim lite import hot paths and generalize perf report
## 中文
- 为 SubTracker 备份追加导入增加 append-noop 快路径,命中时直接返回并跳过 followups。
- 复用追加导入的预查结果,减少重复查库,并把 trace 补到 noop 判定步骤。
- 泛化 lite before/after perf 报告脚本与根脚本入口,支持任意 baseline/current snapshot root 与标签。

## English
- Add an append-noop fast path for SubTracker backup append imports so no-op restores return early and skip followups.
- Reuse append preflight lookup results to reduce duplicate queries and expose noop detection in the import trace.
- Generalize the lite before/after perf report script and root entry so it can compare arbitrary baseline/current snapshot roots and labels.
2026-05-30 15:31:34 +08:00
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