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fix(clickhouse): harden R/W path P0–P3 (cleanup, durability, rollups)
Honest TTL cleanup semantics; enqueue-safe dedup with flush retry and writer metrics; model insert hooks; latest-per-node and hourly metric/openresty rollups; small-host pool/async defaults, traffic hourly TTL, and UV labeling.
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# ClickHouse P0–P3 修复计划
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> 状态: 已完成(已合并主工作区,`make code-check` 通过)
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> 策略: 4 个互不干扰 worktree 并行,最后由主代理合并
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## 任务拆分
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| ID | Worktree 主题 | 范围 | 禁止改动 |
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|----|---------------|------|----------|
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| WT1 | P0 清理语义 C1 | cleanup maintenance / delete / tasks | chwriter、dashboard、DDL 新 MV |
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| WT2 | 写路径 C2+H1+H2+H3 | chwriter、batchwriter、risk_control、model store 分层、status 指标 | goose 迁移、dashboard 读逻辑 |
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| WT3 | 读路径 H4+H5 | 最新快照查询、metric/openresty 小时 MV + 读路径 | chwriter、cleanup |
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| WT4 | P3 打磨 | 连接池/async_insert、traffic hourly TTL、UV 语义 | model store 分层、cleanup |
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## 合并顺序
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1. WT1 → 2. WT2 → 3. WT3 → 4. WT4
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(迁移文件时间戳已错开,changelog 由主代理统一写)
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## 验收
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各 worktree: 相关 `go test` + 可运行部分;合并后 `make code-check`。
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