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mads
repo group: fix logging of rename/move

After renaming a group, it would iterate over all the contained groups and
repos and update their full path while logging the update from the/old/path to
the the/new/path. Doing that, it would also visit the already renamed top level
group, but since the full path of that one already had been updated, it would
log it as renaming from the/new/path to the/new/path.

Fixed by logging when renaming in the first place, and skipping the top level
repo group while iterating.

To avoid redundant logging, only log (and rename) if the name or parent
actually change.

Based on a patch by toras9000.
.. _statistics:

=====================
Repository statistics
=====================

Kallithea has a *repository statistics* feature, disabled by default. When
enabled, the amount of commits per committer is visualized in a timeline. This
feature can be enabled using the ``Enable statistics`` checkbox on the
repository ``Settings`` page.

The statistics system makes heavy demands on the server resources, so
in order to keep a balance between usability and performance, statistics are
cached inside the database and gathered incrementally.

When Celery is disabled:

  On each first visit to the summary page a set of 250 commits are parsed and
  added to the statistics cache. This incremental gathering also happens on each
  visit to the statistics page, until all commits are fetched.

  Statistics are kept cached until additional commits are added to the
  repository. In such a case Kallithea will only fetch the new commits when
  updating its statistics cache.

When Celery is enabled:

  On the first visit to the summary page, Kallithea will create tasks that will
  execute on Celery workers. These tasks will gather all of the statistics until
  all commits are parsed. Each task parses 250 commits, then launches a new
  task.