## Summary
An audit of the SQLite→PostgreSQL store migration found data-store paths
still reaching the removed SQLite stub in backend (PG) mode. In backend
mode `store.db`/`getDatabase()` throw the removed-SQLite error, so each
of these either threw on every run or — worse — had the throw swallowed
into a silent wrong result. This PR routes all of them through the
`AsyncDataLayer` (and removes one dead primitive).
## The 6 live bugs fixed
| Fix | Was |
|-----|-----|
| `executor.ts` authoritative assigned-agent fallback now inherits the
TaskStore `asyncLayer` | silently returned `null` → model drift to the
pi built-in (the exact thing its comment guards) |
| `pruneAgentLogFilesAsync` replaces the sync self-healing prune call |
threw `SQLite Database is not available` every maintenance sweep →
agent-log pruning never ran |
| `cleanupOrphanedMaterializedSteps` deletes PG `workflow_steps` rows on
a failed create | swallowed the throw → leaked rows |
| `deleteTaskBackendImpl` now runs the async mission feature/task-link
unlink | PG hard delete left orphaned mission links |
| `getWorkflowSettingsProjectId` returns `rootDir` in backend mode
without touching the stub | swallowed throw for unscoped backend stores
|
| `fn plugin` unregistered-project fallback bootstraps a `CentralCore`
`AsyncDataLayer` | layerless `PluginStore` threw in PG |
## The 4 latent traps, fixed properly
- **`cleanupArchivedTasks`** — real async port (enumerate archived
soft-deleted rows, guarantee cold snapshot, hard-delete project row +
purge selection rows + rm dir).
- **`deleteWorkflowStep`** — real async port (delete `workflow_steps`
via the layer with `.returning()` to preserve the not-found contract).
- **`applyTaskPatch`** — **removed** (zero-caller SQLite column-patch
primitive with no backend analogue; impl + facade + import deleted).
- **`AgentStore.importLegacyFileRuns`** — clean backend no-op (no legacy
SQLite run-files exist in a PG deployment; its only `init()` caller
early-returns in backend mode).
## Symptom Verification
New PG regression suite
`packages/core/src/__tests__/postgres/store-sqlite-residue-fixes.pg.test.ts`
reproduces the original failures against real embedded Postgres and
asserts they're gone:
- orphaned `workflow_steps` are actually deleted (no swallowed throw)
- `pruneAgentLogFilesAsync` resolves and prunes inactive-task log files
- hard delete unlinks the mission feature from the task
- `deleteWorkflowStep` removes the row / reports not-found
- `cleanupArchivedTasks` hard-deletes the project row while retaining
the cold snapshot
## Verification
- `@fusion/core`, `@fusion/engine`, `@runfusion/fusion` typecheck clean
- ~50 existing + 5 new PG tests pass; lint clean; changeset validates
🤖 Generated with [Claude Code](https://claude.com/claude-code)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Prevented PostgreSQL backend maintenance from hitting removed legacy
SQLite code paths, avoiding datastore failures and residue cleanup
issues.
* Fixed workflow-step deletion and “not found” behavior in backend mode.
* Ensured backend hard-deletes correctly unlink related mission
feature/task links and clean orphaned materialized steps.
* Prevented legacy file-run imports from incorrectly reporting success
in backend mode.
* **New Features**
* Added async agent-log pruning for inactive tasks and updated
maintenance to use it.
* **Tests**
* Added PostgreSQL regression coverage for residue fixes and
archive/workflow cleanup.
* **Refactor**
* Removed an unused task patch operation and updated task-store cleanup
methods to be async where needed.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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