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docs(keycloak-session-store): import the session-storage lab as a new project

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The keycloak project ended with four open questions that design could not
settle. A two-VM lab was built to answer them by measurement, and this is
that material: 26 experiments, 125 raw command outputs, 22 browser captures.

Follows the import procedure in README.md.

  source/     the originating repository verbatim — 78 documents, 28 SVGs,
              8 manifests, plus .source-revision recording the commit
  final/      the SSOT
    document.md   729 lines written from the 29 experiment documents, not
                  concatenated: what was predicted, what was measured, and
                  where the measurement itself was wrong
    evidence/raw    125 outputs, flattened to <experiment>__<file> because
                    the originals collided (01-baseline.txt appeared three
                    times) and the audit only globs the top level
    evidence/meta   one per raw file; command and exitCode are null and the
                    README says why rather than inventing them
    evidence/browser  22 captures
    assets/       three diagrams through techviz
    .techviz/     their VizSpecs

A separate project rather than an addition to keycloak: the B-layer answers
that project's four questions, but the A, C and D layers are about cluster
failure, SSO and operations, and one document.md should hold one subject.
The four question records there can point here through 관계.

Recorded rather than papered over: only three of the 28 diagrams were
remade. The repository forbids hand-drawn SVG and forbids titles inside the
canvas; all 28 originals carry both, so converting them is redrawing, not
reformatting. They stay in source/ and the gap is written into the document.

verify-pipeline.py passes. audit-records.py reports no issues.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
DongHyeonka
2026-09-04 22:51:59 +09:00
co-authored by Claude Opus 5
parent 43bccd08a8
commit b2963105a8
5017 changed files with 372751 additions and 4943 deletions
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docs/clean-architecture-backend-template/final/evidence/rendered/a06-f013-recordapplied.svg
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<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="1712" viewBox="0 0 1200 1712" role="img">
<title>terminal evidence</title>
<desc>Terminal-style rendering generated from retained command output. Sensitive-looking values are redacted in the visual asset.</desc>
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<rect x="1" y="1" width="1198" height="44" rx="14" fill="#161b22"/>
<rect x="1" y="30" width="1198" height="14" fill="#161b22"/>
<circle cx="24" cy="22" r="6" fill="#ff5f57"/>
<circle cx="44" cy="22" r="6" fill="#febc2e"/>
<circle cx="64" cy="22" r="6" fill="#28c840"/>
<text x="92" y="27" fill="#8b949e" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace">terminal evidence</text>
<text x="24" y="68" fill="#c9d1d9" font-size="15" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">$ M=src/adapter/outbound/persistence-mongo/src/main/java/dev/caskeleton/adapter/outbound/mongo/migration
echo &#x27;# 인터페</tspan><tspan x="24" dy="22">이스가 적는 계약&#x27;
sed -n &#x27;18,29p&#x27; $M/MongoMigrationLedger.java
echo
echo &#x27;# 구현이 하는 일&#x27;
sed -n &#x27;93,99p&#x27; $M/MongoCol</tspan><tspan x="24" dy="22">lectionMigrationLedger.java
echo
echo &#x27;# 그 구현이 부르는 검사와 그 검사의 javadoc&#x27;
sed -n &#x27;171,182p&#x27; $M/MongoCollect</tspan><tspan x="24" dy="22">ionMigrationLedger.java
echo
echo &#x27;# 같은 파일의 saveCheckpoint 는 저장된 펜스를 조건으로 건다&#x27;
sed -n &#x27;145,153p&#x27; $M/Mo</tspan><tspan x="24" dy="22">ngoCollectionMigrationLedger.java
echo
echo &#x27;# 그리고 중복 키를 잡아 번역한다. 그렇게 된 이유가 주석에 있다&#x27;
sed -n &#x27;</tspan><tspan x="24" dy="22">141,144p&#x27; $M/MongoCollectionMigrationLedger.java
sed -n &#x27;157,167p&#x27; $M/MongoCollectionMigrationLedger.java</tspan></text>
<text x="24" y="200" fill="#8b949e" font-size="13" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">cwd: /shared/codebase/clean-architecture-backend-template</tspan></text>
<text x="24" y="222" fill="#8b949e" font-size="13" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">time: 2026-09-02T07:40:13+00:00 · exit 0</tspan></text>
<line x1="24" y1="236" x2="1176" y2="236" stroke="#30363d"/>
<text x="24" y="276" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 인터페이스가 적는 계약</tspan></text>
<text x="24" y="298" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> /**</tspan></text>
<text x="24" y="320" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * Records a completed migration, only if the fence is still the current one.</tspan></text>
<text x="24" y="342" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> *</tspan></text>
<text x="24" y="364" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * &lt;p&gt;Conditioned on the fence because the runner that wrote the batches may no longer be the</tspan></text>
<text x="24" y="386" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * runner that owns the lease. A ledger entry from a superseded runner says a migration completed</tspan></text>
<text x="24" y="408" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * when the work it describes was overwritten by the runner that replaced it.</tspan></text>
<text x="24" y="430" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> *</tspan></text>
<text x="24" y="452" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * @param fence the acquisition token from {@link MongoMigrationLock#fence()}</tspan></text>
<text x="24" y="474" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * @throws dev.caskeleton.adapter.outbound.mongo.api.error.MongoOperationRejectedException when a</tspan></text>
<text x="24" y="496" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * newer acquisition exists</tspan></text>
<text x="24" y="518" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> */</tspan></text>
<text x="24" y="540" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> void recordApplied(</tspan></text>
<text x="24" y="562" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
<text x="24" y="584" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 구현이 하는 일</tspan></text>
<text x="24" y="606" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> requireCurrentFence(fence, &quot;ledger entry for &quot; + migrationId.value());</tspan></text>
<text x="24" y="628" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> ledger.insertOne(</tspan></text>
<text x="24" y="650" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> new Document(MIGRATION_ID, migrationId.value())</tspan></text>
<text x="24" y="672" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> .append(&quot;checksum&quot;, checksum.value())</tspan></text>
<text x="24" y="694" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> .append(&quot;operator&quot;, operator)</tspan></text>
<text x="24" y="716" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> .append(&quot;appliedAt&quot;, Date.from(appliedAt))</tspan></text>
<text x="24" y="738" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> .append(&quot;fence&quot;, fence));</tspan></text>
<text x="24" y="760" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
<text x="24" y="782" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 그 구현이 부르는 검사와 그 검사의 javadoc</tspan></text>
<text x="24" y="804" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> /**</tspan></text>
<text x="24" y="826" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * Refuses a write from an unfenced lease.</tspan></text>
<text x="24" y="848" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> *</tspan></text>
<text x="24" y="870" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * &lt;p&gt;An unfenced lease cannot prove the writer is still the owner, and the whole point of the</tspan></text>
<text x="24" y="892" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * ledger is that it says what actually happened.</tspan></text>
<text x="24" y="914" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> */</tspan></text>
<text x="24" y="936" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> private static void requireCurrentFence(long fence, String what) {</tspan></text>
<text x="24" y="958" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> if (fence == MongoMigrationLock.UNFENCED) {</tspan></text>
<text x="24" y="980" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> throw MongoOperationRejectedException.of(</tspan></text>
<text x="24" y="1002" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> &quot;migration.fence&quot;,</tspan></text>
<text x="24" y="1024" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> &quot;refusing to write the &quot;</tspan></text>
<text x="24" y="1046" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> + what</tspan></text>
<text x="24" y="1068" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
<text x="24" y="1090" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 같은 파일의 saveCheckpoint 는 저장된 펜스를 조건으로 건다</tspan></text>
<text x="24" y="1112" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> long replaced =</tspan></text>
<text x="24" y="1134" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> checkpoints</tspan></text>
<text x="24" y="1156" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> .replaceOne(</tspan></text>
<text x="24" y="1178" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> Filters.and(</tspan></text>
<text x="24" y="1200" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> Filters.eq(MIGRATION_ID, checkpoint.migrationId().value()),</tspan></text>
<text x="24" y="1222" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> Filters.or(Filters.exists(&quot;fence&quot;, false), Filters.lte(&quot;fence&quot;, fence))),</tspan></text>
<text x="24" y="1244" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> document,</tspan></text>
<text x="24" y="1266" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> new ReplaceOptions().upsert(false))</tspan></text>
<text x="24" y="1288" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> .getMatchedCount();</tspan></text>
<text x="24" y="1310" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
<text x="24" y="1332" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 그리고 중복 키를 잡아 번역한다. 그렇게 된 이유가 주석에 있다</tspan></text>
<text x="24" y="1354" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // Nor was the refusal itself reachable. With `upsert(true)`, a superseded write matches nothing</tspan></text>
<text x="24" y="1376" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // and MongoDB attempts an insert, which the unique index on migrationId rejects — so a</tspan></text>
<text x="24" y="1398" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // superseded runner got a driver-level duplicate-key error instead of the sentence written for</tspan></text>
<text x="24" y="1420" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // it, and the branch meant to produce that sentence was dead.</tspan></text>
<text x="24" y="1442" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> try {</tspan></text>
<text x="24" y="1464" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> checkpoints.insertOne(document);</tspan></text>
<text x="24" y="1486" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> } catch (MongoWriteException duplicate) {</tspan></text>
<text x="24" y="1508" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> if (duplicate.getError().getCategory() != ErrorCategory.DUPLICATE_KEY) {</tspan></text>
<text x="24" y="1530" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> throw duplicate;</tspan></text>
<text x="24" y="1552" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> }</tspan></text>
<text x="24" y="1574" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // Either the checkpoint was already there and the fence filter excluded it, or another runner</tspan></text>
<text x="24" y="1596" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // inserted between the replace and this insert. Both are the same fact about this runner.</tspan></text>
<text x="24" y="1618" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> throw MongoOperationRejectedException.of(</tspan></text>
<text x="24" y="1640" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> &quot;migration.fence&quot;,</tspan></text>
<text x="24" y="1662" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> &quot;a newer migration runner owns the lease; this runner&#x27;s checkpoint write was refused&quot;);</tspan></text>
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