weichenandCursor
1623a9a0fe
Why: The task card still said C4 and C5 had not run, which would make the pull request describe the wrong result. Evidence: B6, C4, and C5 receipts already on the card (SELF). drill_driver tests pass after grouping the imports. Impact: The card now states K4 failed and second-instance writes stay closed. No product code change. Refs: feature/u7-ops-drills Co-authored-by: Cursor <cursoragent@cursor.com>
U7 运维演练（C4 / C5）
只打隔离栈。实例名必须以 u7drill 或 u7bk 开头，端口必须落在 18980–18999。
脚本只按自己的 pidfile 结束进程，并且先核对命令行里有本演练的数据目录或端口。
| 文件 | 职责 |
|---|---|
lib.sh |
隔离 PG / Redis / serve 的创建、回收、端口与名称守卫 |
drill_driver/ |
时间线、幂等重放、SSE seq、标记写入、工件、限流突发、权限核对 |
run_fault_drill.sh |
C4：pg-stop、pg-kill、redis-kill |
run_backup_drill.sh |
C5：物理备份 + WAL/PITR，以及 pg_dump，恢复到新目标 |
tests/ops/self_check.sh
tests/ops/run_fault_drill.sh --fault all
tests/ops/run_backup_drill.sh
结果在 results/<ts>/（gitignore）。证据以 make evidence 记入任务卡，来源是 SELF。
本入口不放行第二实例写流量。