# GovOPlaN Workflow Engine

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**Repository type:** module (platform).
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Headless workflow definition and execution services for GovOPlaN modules.

Workflow Engine owns the canonical BPMN/native graph model, immutable
definition revisions, runtime instances and evidence, migrations, validation,
execution adapters, dispatch, retries, and recovery. It intentionally provides
no primary navigation or visual editor. Modules can depend on runtime module ID
`workflow_engine` and the versioned `workflow.*` interfaces without installing
the optional `govoplan-workflow` editor.

The extraction preserves the existing `workflow_*` tables, Alembic revision
IDs, `/api/v1/workflow` routes, `workflow:*` permissions, instance IDs, and
audit references. See [the engine/editor split](docs/ENGINE_EDITOR_SPLIT.md)
for the ownership and compatibility policy.
See [the module concept](docs/CONCEPT.md) and
[BPMN interoperability contract](docs/BPMN_INTEROPERABILITY.md) for runtime
semantics and adapter boundaries.

The optional `workflow_engine.service_launcher` capability lets Portal start an
authorized active workflow from an exact published Service revision. It resolves
tenant overrides before system baselines, pins the selected workflow revision,
records the Service and binding in trusted instance context, and safely replays
the same launch after an ambiguous response. Portal never accesses Workflow
Engine tables.

Active definitions reconcile durable API, one-time/interval schedule,
platform-event, and parent-workflow trigger registrations. A shared worker
claims due deliveries with scale-out-safe locking, rechecks the exact active
revision and automation authority, and starts instances idempotently. Duration,
deadline, and platform-event waits are persistent runtime state rather than
human handoffs; event filters and variable mappings are bounded JSON
expressions and never executable code. Cron remains an optional governed
scheduler-adapter concern.

## Checks

```bash
/mnt/DATA/git/govoplan/.venv/bin/python -m unittest discover -s tests
```