For bitbucket issue #2, tweak the admin settings for the Post model to reduce slow queries. Define our own queryset() method so we can control the select_related(), and not have it cascade from post to topics to forums to categories. Removed 'topic' from list_display because MySQL still sucked with 2 inner joins. Now it seems to be tolerable with only one join to User.

"""
Celery tasks for the accounts application.

"""
from celery.task import task

from accounts.stats import update_user_stats


@task
def user_stats_task(user_id):
    """
    Run the update_user_stats() function on a new task.

    """
    update_user_stats(user_id)