[sfmskywalker]

Closes #238. Program #58.

Problem

ResourceLifecycleMarkerTransitionService read the current marker, ran the before hooks, then upserted with SaveMarkerAsync. Two concurrent marker writes on one resource both passed the read, for example an archive and a soft-delete, or two policy applications. Both returned Applied, both after-archive hooks saw Succeeded, and the last write won.

That broke the documented lifecycle-marker-conflict contract under concurrency. Hook consumers saw two successful archive points for one marker: the Aster.Elsa trigger could send Resource Archived for a resource that ended up soft-deleted.

Change

• New store method: IResourceLifecycleMarkerStore.CreateMarkerAsync returns ResourceLifecycleMarkerCreateResult { Created, Marker }. Marker is the marker it wrote, or the one already there. The API is still unshipped, and PublicAPI.Unshipped.txt is updated.
  • In-memory: ConcurrentDictionary.GetOrAdd.
  • SQLite and Postgres: a new RelationalJsonDialect.InsertPayloadIfAbsent, which runs INSERT … ON CONFLICT (tenant_id, resource_id) DO NOTHING.
  • SQL Server: INSERT … SELECT … WHERE NOT EXISTS (… WITH (UPDLOCK, HOLDLOCK)). The range lock makes a second insert wait, then find the first row. It keeps the DATALENGTH comparison used by the existing upsert.
  • Relational, when nothing was inserted: the store reads the existing marker on the same connection. If a concurrent restore cleared it in between, the insert runs again.
• Service: the transition service uses CreateMarkerAsync. A write that loses the race runs the after-archive hooks with Failed. It then returns what the pre-check would have returned had it run second: AlreadySatisfied for the same state, otherwise Failed with lifecycle-marker-conflict.
• Unchanged: SaveMarkerAsync stays an upsert, and portability import still uses it.
• Docs and tests: the core README and the in-repo test doubles are updated.

Tests

• New file Persistence/LifecycleMarkerRaceStoreTests.cs, with one class per provider (in-memory, SQLite, Postgres, SQL Server):
  • ArchiveAndSoftDeleteRace_OneAppliesAndTheOtherConflicts
  • TwoArchivesRace_OneAppliesAndTheOtherIsAlreadySatisfied
  • CreateMarkerAsync_WritesOnlyWhenTheResourceHasNoMarkerInItsTenant
• A before-archive hook holds both writers until both arrive, so the race is deterministic, with no sleeps.
• All 8 race tests fail on main: both writes succeed, and the same-state case gets two Succeeded after-hooks.
• With the fix, all 12 pass, and they passed in each of five repeated runs.
• Aster.Tests: 1949/1949 on each of net8.0, net9.0 and net10.0, with Postgres and SQL Server required.
• Aster.Elsa.Tests: 76/76 on net10.0.

Notes

• Any third-party implementation of IResourceLifecycleMarkerStore must add CreateMarkerAsync. This is acceptable before 1.0; all in-repo stores and doubles are updated.
• On SQL Server, the range lock covers one key per write, so contention only arises between writers marking the same resource.

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Generated by Claude Code

Summary by CodeRabbit

• New Features

  • Added atomic lifecycle-marker creation across supported storage providers.
  • Concurrent writes now prevent duplicate markers and return the existing marker when appropriate.
  • Added tenant-scoped marker handling to preserve resource isolation.

• Bug Fixes

  • Archive and restore operations now correctly handle competing writes and concurrent marker changes.
  • Lifecycle hooks accurately reflect whether an operation succeeded or lost a race.

• Documentation

  • Clarified concurrency behavior for lifecycle-marker writes and lifecycle hooks.

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• test/Aster.Tests/Persistence/LifecycleMarkerRaceStoreTests.cs

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• test/Aster.Tests/Persistence/LifecycleMarkerRaceStoreTests.cs

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📝 Walkthrough

Lifecycle marker stores now support atomic create-if-absent writes. Transition handling reports concurrent writes using the existing marker state and invokes after hooks with the corresponding status. Tests cover in-memory, SQLite, PostgreSQL, and SQL Server providers.

Changes: Lifecycle marker races

Layer / File(s)	Summary
Marker creation contract and in-memory store src/core/Aster.Core/Abstractions/IResourceLifecycleMarkerStore.cs, src/core/Aster.Core/Models/Instances/ResourceLifecycleMarker.cs, src/core/Aster.Core/InMemory/InMemoryResourceLifecycleMarkerStore.cs, src/core/Aster.Core/PublicAPI.Unshipped.txt	The store interface adds CreateMarkerAsync, which returns a creation status and the stored marker. The in-memory store creates a marker only when no marker exists for that tenant and resource.
Relational insert-if-absent src/persistence/Relational/RelationalJsonDialect.cs, src/persistence/Aster.Persistence.SqlServerJson/SqlServerJsonDialect.cs, src/persistence/Relational/RelationalJsonResourceStore.cs	Relational dialects add insert-if-absent SQL. The resource store returns an existing marker after a competing insert and retries if a concurrent restore removes it before it can be read.
Transition outcomes and race validation src/core/Aster.Core/Services/ResourceLifecycleMarkerTransitionService.cs, src/core/Aster.Core/README.md, test/Aster.Tests/Persistence/LifecycleMarkerRaceStoreTests.cs, test/Aster.Tests/Lifecycle/*, test/Aster.Tests/Operational/OperationalHardeningTests.cs	The transition service uses atomic creation and handles same-state and conflicting existing markers. Race tests cover four providers, and the documentation and test stores describe or implement the updated contract.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant TransitionService as ResourceLifecycleMarkerTransitionService
  participant Store as RelationalJsonResourceStore
  participant Database as SQL database
  participant Hooks as ResourceLifecycleHook
  TransitionService->>Store: CreateMarkerAsync
  Store->>Database: Insert payload if key is absent
  Database-->>Store: Inserted row or existing marker
  Store-->>TransitionService: Creation result and stored marker
  alt Marker created
    TransitionService->>Hooks: Run after hook with success status
  else Marker already exists
    TransitionService->>Hooks: Run after hook with failed status
  end

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Possibly related issues

• valence-works/aster#238 — The pull request adds the atomic marker creation and race handling described by this issue.

Merge Risk: ⚪ Minimal · up to 8b69d

No concrete issue remains identified that would prevent merging after normal checks.

Security architecture risk: 🔵 Low · up to ee6cc

The change closes a concurrency race without expanding the resources callers can address. Remaining uncertainty concerns behavior under production contention and authorization in consuming applications.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The changed mutation decision is scoped to one tenant/resource marker. Its downstream effects include registered lifecycle hooks and archive-triggered workflows. The inspected change preserves the existing addressable tenant/resource set rather than establishing a new remote entrypoint.

Trust Boundaries and Controls

• observed — A losing writer invokes after-hooks with Failed rather than Succeeded. The Elsa archive consumer independently requires both Succeeded and Archived before publishing ResourceArchived, preventing a losing archive attempt from producing that successful event through this path.
• observed — The relational create path binds tenant, resource, and payload as parameters. SQL Server retains identifier validation against trailing-space aliases and a composite tenant/resource primary key, preserving the inspected isolation controls.

Resilience and Maintainability Implications

• observed — Marker persistence and completion hooks remain separate operations. Cancellation after persistence can interrupt hook completion, and a successful-hook failure can become a diagnostic without undoing the marker. Base comparison shows this failure window predates the PR; atomic creation does not establish transactional or exactly-once hook delivery.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 31.11% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 45 functions across 11 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: lifecycle markers now use create-if-absent behavior for archive and soft-delete operations.
Linked Issues check		The changes meet the coding requirements in [#238]. CreateMarkerAsync provides atomic create-if-absent behavior for in-memory, SQLite, PostgreSQL, and SQL Server stores. `ResourceLifecycleMarkerTran…
Out of Scope Changes check		The changes remain within [#238]. The API update, relational dialect support, documentation, test doubles, and provider-specific tests support the marker creation contract or its concurrency behavior.…

Full details: Linked Issues check

Explanation

The changes meet the coding requirements in [#238]. CreateMarkerAsync provides atomic create-if-absent behavior for in-memory, SQLite, PostgreSQL, and SQL Server stores. ResourceLifecycleMarkerTransitionService uses it and reports AlreadySatisfied or lifecycle-marker-conflict for race losers. Failed race losers run after hooks with Failed. SaveMarkerAsync remains the upsert path. Provider-specific tests cover the required archive and soft-delete race.

Full details: Out of Scope Changes check

Explanation

The changes remain within [#238]. The API update, relational dialect support, documentation, test doubles, and provider-specific tests support the marker creation contract or its concurrency behavior. No unrelated change is demonstrated.

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Inline comments:
Review comments at
@test/Aster.Tests/Persistence/LifecycleMarkerRaceStoreTests.cs:
- Around line 48-68: Update
TwoArchivesRace_OneAppliesAndTheOtherIsAlreadySatisfied to use the
status-bearing IResourceLifecycleMarkerTransitionService via a
TransitionRaceAsync helper, then assert exactly one Applied and one
AlreadySatisfied result while preserving the stored-marker assertions.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: c4bf9bec-0ca2-48d0-8555-6228f0584d21

📥 Commits

Reviewing files that changed from the base of the PR and between bfbcc2c and ee6cc58.

📒 Files selected for processing: 13

• src/core/Aster.Core/Abstractions/IResourceLifecycleMarkerStore.cs
• src/core/Aster.Core/InMemory/InMemoryResourceLifecycleMarkerStore.cs
• src/core/Aster.Core/Models/Instances/ResourceLifecycleMarker.cs
• src/core/Aster.Core/PublicAPI.Unshipped.txt
• src/core/Aster.Core/README.md
• src/core/Aster.Core/Services/ResourceLifecycleMarkerTransitionService.cs
• src/persistence/Aster.Persistence.SqlServerJson/SqlServerJsonDialect.cs
• src/persistence/Relational/RelationalJsonDialect.cs
• src/persistence/Relational/RelationalJsonResourceStore.cs
• test/Aster.Tests/Lifecycle/LifecycleArchiveRestoreHookTests.cs
• test/Aster.Tests/Lifecycle/LifecycleRestoreDiagnosticsTests.cs
• test/Aster.Tests/Operational/OperationalHardeningTests.cs
• test/Aster.Tests/Persistence/LifecycleMarkerRaceStoreTests.cs

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