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docs: correct the places where documents contradicted their own evidence

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An independent audit found ten documents printing values their evidence files do not contain. C-1 printed a session count of 0 where the evidence says 4, C-2 printed a success readback for a command that exited 1, and A-1 credited the conntrack flush with a split that the timestamps attribute to a pod restart four seconds earlier.

Also measured wal_writer_delay, which A-3 had asserted as matching without ever querying it, relabelled the A-6 control that moved 41 percent, noted A-8's nine-sample resolution, corrected D-1's RTO to the 41 seconds its own timeline shows, and added a correction banner to D-2. Every experiment document now links its evidence files with their real collection times, and the duplicate screenshots are documented as duplicates.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
DongHyeonka
2026-09-04 16:35:49 +09:00
co-authored by Claude Opus 5
parent 78b270559c
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docs/experiment-a3-database-crash.md
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@@ -181,8 +181,23 @@ database system is ready to accept connections
★ p5XybeQIYmAs818gO4Vl_5ea
```
**약 2.6% 유실.** 초당 19건 정도 로그인하던 중이었으므로
**대략 마지막 0.2초 분량**이다 — `wal_writer_delay` 기본값(200ms)과 맞는다.
**약 2.6% 유실.**
처음 이 문서는 *"초당 19건 … `wal_writer_delay` 기본값(200ms)과 맞는다"* 고
썼는데, **그 시점에 `wal_writer_delay` 를 조회한 적이 없었다.** 나중에 쟀다.
```
name | setting | unit | source
------------------------+---------+------+---------
wal_writer_delay | 200 | ms | default
wal_writer_flush_after | 128 | 8kB | default
synchronous_commit | on | | default
```
[`08-wal-settings.txt`](evidence/a3-database-crash/08-wal-settings.txt)
**값은 맞았지만 그때는 추정이었다.** 그리고 로그인 속도도 정확히는
증거의 `8초에 112건` ≈ **초당 14건**이며 19건이 아니다. 4건은 그 속도에서
**약 0.29초 분량**이고, 200ms 창과 같은 자릿수이되 정확히 일치하지는 않는다.
### 사용자에게 어떻게 보이는가
@@ -284,6 +299,25 @@ ALTER DATABASE keycloak SET synchronous_commit = on; -- SET LOCAL 이 이깁
---
---
## 증거 파일
**증거 수집 시각: 2026-09-04 11:58 – 16:32 KST** (파일 mtime 기준. 문서 상단의 시각 표기는 작성 시점이라 다를 수 있다.)
| 파일 | 종류 |
|---|---|
| [`01-crash-injection.txt`](evidence/a3-database-crash/01-crash-injection.txt) | 터미널 원문 |
| [`02-design-check.txt`](evidence/a3-database-crash/02-design-check.txt) | 터미널 원문 |
| [`03-loss-measurement.txt`](evidence/a3-database-crash/03-loss-measurement.txt) | 터미널 원문 |
| [`04-comparison.txt`](evidence/a3-database-crash/04-comparison.txt) | 터미널 원문 |
| [`05-true-crash.txt`](evidence/a3-database-crash/05-true-crash.txt) | 터미널 원문 |
| [`06-backend-kill-crash.txt`](evidence/a3-database-crash/06-backend-kill-crash.txt) | 터미널 원문 |
| [`07-loss-result.txt`](evidence/a3-database-crash/07-loss-result.txt) | 터미널 원문 |
| [`08-wal-settings.txt`](evidence/a3-database-crash/08-wal-settings.txt) | 터미널 원문 |
파일별 상세는 [`evidence/a3-database-crash/README.md`](evidence/a3-database-crash/README.md).
## 8. 재현 절차 (명령어)
```bash