Method DeleteSubtask

backend/Controllers/TasksController.cs:169–193

(int subtaskId)

    }

    [HttpDelete("subtasks/{subtaskId}")]
    public async Task<IActionResult> DeleteSubtask(int subtaskId)
    {
        try
        {
            int userId = GetUserId();
            // Fetch subtask before deletion to get TaskCardId for SignalR
            var subtask = await _taskService.GetSubtaskByIdAsync(subtaskId);
            if (subtask == null) return NotFound();

            var result = await _taskService.DeleteSubtaskAsync(subtaskId, userId);
            if (!result) return NotFound();

            // Notify board
            var task = await _taskService.GetTaskByIdAsync(subtask.TaskCardId, userId);
            if (task != null)
            {
                await _hubContext.Clients.Group($"board_{task.BoardId}")
                    .SendAsync("TaskUpdated", task);
            }

            return NoContent();
        }
        catch (UnauthorizedAccessException) { return Forbid(); }
    }

    [HttpGet("{taskId}/activities")]
    public async Task<IActionResult> GetTaskActivities(int taskId)