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* feat(chat): support deleting chat sessions
Replaces the unreachable archive endpoint with a real hard delete and
exposes it from the chat history panel.
- DELETE /api/chat/sessions/{id} now hard-deletes the session and its
messages (CASCADE), cancels any in-flight tasks before removal so the
daemon doesn't keep running work whose result has nowhere to land,
and broadcasts chat:session_deleted.
- Frontend adds a per-row delete button with a confirmation dialog,
optimistically drops the session from both list caches, and clears the
active session pointer locally + on other tabs via the WS handler.
Co-authored-by: multica-agent <github@multica.ai>
* fix(chat): make session delete atomic and keep archived sessions read-only
Address review feedback on #2115.
- DeleteChatSession now runs lock + cancel + delete in a single tx and
only broadcasts events post-commit. The new LockChatSessionForDelete
query takes FOR UPDATE on chat_session, which blocks the FK validation
of any concurrent SendChatMessage trying to enqueue a task for this
session — that insert fails after we commit, so it can no longer
produce an orphaned task whose chat_session_id is nulled by
ON DELETE SET NULL. Cancel failure now aborts the delete instead of
warn-and-continue.
- SendChatMessage refuses non-active sessions again. The archive code
path is gone, but legacy rows with status='archived' may still exist
in the DB; keep the guard until we explicitly migrate them.
- Frontend re-reads allChatSessionsOptions to disable ChatInput on
legacy archived sessions so the UX matches the server-side guard.
Co-authored-by: multica-agent <github@multica.ai>
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Co-authored-by: multica-agent <github@multica.ai>