fix(hitl): rollback on KB delete failure, tighten linear tool guards

- delete_linear_issue + delete_notion_page: add db_session.rollback()
  in the KB document deletion exception handler so the session is never
  left in a PendingRollbackError state after a failed commit, which
  would otherwise break all subsequent DB operations in the same request
- delete_linear_issue: include issue identifier (e.g. ENG-42) in the
  success message so the caller can confirm which issue was archived
- update_linear_issue: remove redundant label_ids ternary
  (x if x is not None else None -> x)
- create_linear_issue: add logger.error on empty-title guard for parity
  with the equivalent Notion tool

surfsense_backend/app/agents/new_chat/tools/linear/create_issue.py

@@ -144,6 +144,7 @@ def create_create_linear_issue_tool(
             final_connector_id = final_params.get("connector_id", connector_id)
 
             if not final_title or not final_title.strip():
+                logger.error("Title is empty or contains only whitespace")
                 return {"status": "error", "message": "Issue title cannot be empty."}
             if not final_team_id:
                 return {

surfsense_backend/app/agents/new_chat/tools/linear/delete_issue.py

@@ -99,6 +99,7 @@ def create_delete_linear_issue_tool(
                     return {"status": "error", "message": error_msg}
 
             issue_id = context["issue"]["id"]
+            issue_identifier = context["issue"].get("identifier", "")
             document_id = context["issue"]["document_id"]
             connector_id_from_context = context.get("workspace", {}).get("id")
 
@@ -229,12 +230,15 @@ def create_delete_linear_issue_tool(
                         logger.warning(f"Document {document_id} not found in KB")
                 except Exception as e:
                     logger.error(f"Failed to delete document from KB: {e}")
+                    await db_session.rollback()
                     result["warning"] = (
                         f"Issue archived in Linear, but failed to remove from knowledge base: {e!s}"
                     )
 
             if result.get("status") == "success":
                 result["deleted_from_kb"] = deleted_from_kb
+                if issue_identifier:
+                    result["message"] = f"Issue {issue_identifier} archived successfully."
                 if deleted_from_kb:
                     result["message"] = (
                         f"{result.get('message', '')} Also removed from the knowledge base."

surfsense_backend/app/agents/new_chat/tools/linear/update_issue.py

@@ -232,9 +232,7 @@ def create_update_linear_issue_tool(
                 state_id=final_new_state_id,
                 assignee_id=final_new_assignee_id,
                 priority=final_new_priority,
-                label_ids=final_new_label_ids
-                if final_new_label_ids is not None
-                else None,
+                label_ids=final_new_label_ids,
             )
 
             if updated_issue.get("status") == "error":