# Task: Add content activity endpoint

## Feature

`docs/FEATURES/production-workflow.md`

## Goal

Add a content-owned activity history endpoint that is separate from user-facing notifications.

## Scope

- Add persisted content activity entries.
- Add `GET /api/content-items/{id}/activity`.
- Log content creation, revisions, status changes, comments, linked assets, and asset revisions.
- Include field-level metadata for content revision changes such as title, message, channels, hashtags, and publish date.
- Persist publish date changes sent from the content editor revision flow.
- Use the activity endpoint from the content detail production activity tab.

## Out Of Scope

- Full diff rendering UI.
- Deleting tags or assets.
- Notification recipient behavior changes.

## Validation

```bash
dotnet build backend/Socialize.slnx
cd frontend
npm run build
```

## Acceptance Criteria

- [x] `GET /api/content-items/{id}/activity` returns content history for users who can review the content item.
- [x] Activity entries are not filtered by notification recipients.
- [x] Content revision activity records changed fields.
- [x] Publish date changes are saved and included in content activity.
- [x] The content detail activity tab reads from content activity instead of notifications.