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74cfcaa318
Replaces the workflow_id-on-every-event approach (#13684, reverted in #13901) with a generic metadata envelope captured at submission and injected at the server-side send chokepoint. - POST /prompt accepts an opaque ``extra_data.metadata`` dict (falls back to synthesizing ``{"workflow_id": <id>}`` from ``extra_pnginfo.workflow.id`` so existing frontends keep working). - ``PromptServer`` owns a ``prompt_id -> metadata`` map populated at submission, drained when the prompt finishes. ``send_sync`` injects the envelope into any outbound payload that carries a ``prompt_id``, including the ``(preview_image, metadata_dict)`` tuple used by ``PREVIEW_IMAGE_WITH_METADATA``. WS reconnect path carries it too. - Pure helpers live in ``app/prompt_metadata.py`` so the execution layer never depends on workflow concepts and the helpers can be unit-tested without torch. Execution layer (``execution.py``, ``comfy_execution/*``) and the jobs API are unchanged. Backward compatible: existing fields and shapes are preserved, only an additional ``metadata`` field is attached when present.
Pytest Unit Tests
Install test dependencies
pip install -r tests-unit/requirements.txt
Run tests
pytest tests-unit/