Summary

In multiuser mode, admin users were receiving the full InvocationProgressEvent — including the base64 JPEG image preview — for generations started by other users, because the admin socket room received an unfiltered copy of every invocation event.

Fix: When emitting InvocationProgressEvent to the admin room, strip the image field before serialization using Pydantic's model_copy:

# Owner gets the full event (unchanged)
await self._sio.emit(event=event_name, data=event_data.model_dump(mode="json"), room=user_room)

# Admin gets progress metadata (message, percentage) but no image content
if isinstance(event_data, InvocationProgressEvent):
    admin_event_data = event_data.model_copy(update={"image": None})
    await self._sio.emit(event=event_name, data=admin_event_data.model_dump(mode="json"), room="admin")
else:
    await self._sio.emit(event=event_name, data=event_data.model_dump(mode="json"), room="admin")

• Owners still receive the full progress event with image preview in their user:{user_id} room.
• Admins receive InvocationProgressEvent with image: null — progress status (message, percentage) is preserved for monitoring, but image content is not exposed.
• All other invocation events (InvocationStartedEvent, InvocationCompleteEvent, InvocationErrorEvent) forwarded to admin room are unaffected.

Related Issues / Discussions

QA Instructions

1. Run InvokeAI in multiuser mode.
2. Log in as a non-admin user in one browser and start a generation.
3. Log in as an admin in another browser and observe the socket events — progress events should arrive with image: null while message and percentage remain populated.

Merge Plan

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• ❗Changes to a redux slice have a corresponding migration
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)

• Fixes [bug]: Admin can see image previews #60

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