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…, mark-as-read endpoint
Add unread message tracking infrastructure for chat sessions:
- Add last_read_at DATETIME NULL column to datamachine_chat_sessions (dbDelta + ensure migration)
- Add count_unread() helper — counts visible assistant messages with metadata.timestamp > last_read_at
- Add mark_session_read() method — sets last_read_at = NOW() where session_id and user_id match
- Add unread_count to get_user_sessions() return shape
- Add last_read_at to single session GET response (via GetChatSessionAbility)
- Register datamachine/mark-session-read ability
- Add POST /datamachine/v1/chat/sessions/{session_id}/read REST endpoint (uses execute_ability pattern)
Closes #997
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Summary
Add backend infrastructure for tracking unread messages per chat session. This enables unread badges on any frontend with cross-device sync.
last_read_at DATETIME NULLcolumn todatamachine_chat_sessionsvia dbDelta +ensure_last_read_at_column()migration safety netcount_unread()helper — counts visible assistant messages withmetadata.timestamp > last_read_atmark_session_read()method — setslast_read_at = NOW()where session_id and user_id matchunread_counttoget_user_sessions()return shapelast_read_atto single session GET responsedatamachine/mark-session-readability (delegates tomark_session_read())POST /datamachine/v1/chat/sessions/{session_id}/readREST endpointCloses #997
Dependency chain: This is step 1 of 3. The chat package (Extra-Chill/chat#16) and frontend-chat plugin (Extra-Chill/data-machine-frontend-chat#4) depend on this.