Fix finalization cleanup for pending tool executions

internal/handler/conversation_process_details_test.go

@@ -76,6 +76,65 @@ func TestProcessDetailsPageIncludesTerminalToolStatusAcrossPageBoundary(t *testi
 	}
 }
 
+func TestProcessDetailsPageUsesPersistedExecutionStatusAfterBackgroundCancel(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	db, err := database.NewDB(filepath.Join(t.TempDir(), "process-details-cancelled.db"), zap.NewNop())
+	if err != nil {
+		t.Fatalf("NewDB: %v", err)
+	}
+	t.Cleanup(func() { _ = db.Close() })
+	conversation, err := db.CreateConversation("cancelled background", database.ConversationCreateMeta{})
+	if err != nil {
+		t.Fatalf("CreateConversation: %v", err)
+	}
+	message, err := db.AddMessage(conversation.ID, "assistant", "done", nil)
+	if err != nil {
+		t.Fatalf("AddMessage: %v", err)
+	}
+	execID := "exec-cancelled-after-background"
+	if err := db.AddProcessDetail(message.ID, conversation.ID, "tool_call", "call", map[string]interface{}{
+		"toolName": "exec", "toolCallId": "call-cancelled", "index": 1, "total": 1,
+	}); err != nil {
+		t.Fatalf("AddProcessDetail(tool_call): %v", err)
+	}
+	if err := db.AddProcessDetail(message.ID, conversation.ID, "tool_result", "background", map[string]interface{}{
+		"toolName": "exec", "toolCallId": "call-cancelled", "executionId": execID, "status": "background_running", "success": true,
+	}); err != nil {
+		t.Fatalf("AddProcessDetail(tool_result): %v", err)
+	}
+	now := time.Now()
+	if err := db.SaveToolExecution(&mcp.ToolExecution{
+		ID:        execID,
+		ToolName:  "exec",
+		Status:    mcp.ToolExecutionStatusCancelled,
+		StartTime: now,
+		EndTime:   &now,
+	}); err != nil {
+		t.Fatalf("SaveToolExecution: %v", err)
+	}
+
+	w := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(w)
+	c.Request = httptest.NewRequest("GET", "/api/messages/"+message.ID+"/process-details?limit=10&offset=0", nil)
+	c.Params = gin.Params{{Key: "id", Value: message.ID}}
+	NewConversationHandler(db, zap.NewNop()).GetMessageProcessDetails(c)
+	if w.Code != 200 {
+		t.Fatalf("status = %d: %s", w.Code, w.Body.String())
+	}
+	var response struct {
+		ToolExecutions []database.ProcessDetailsToolExecution `json:"toolExecutions"`
+	}
+	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+	if len(response.ToolExecutions) != 1 {
+		t.Fatalf("tool executions = %d, want 1", len(response.ToolExecutions))
+	}
+	if got := response.ToolExecutions[0].Status; got != mcp.ToolExecutionStatusCancelled {
+		t.Fatalf("tool execution status = %q, want cancelled", got)
+	}
+}
+
 func TestProcessDetailsFullBackfillsEmptyToolCallArgumentsFromExecution(t *testing.T) {
 	gin.SetMode(gin.TestMode)
 	db, err := database.NewDB(filepath.Join(t.TempDir(), "process-details-args.db"), zap.NewNop())