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mads
cli: refactor db_create to avoid app initialization in multiple places

Make sure kallithea.config.application.make_app only is invoked at a high level
... and avoid references to kallithea.CONFIG.global_conf right before
kallithea.CONFIG is set to a plain dict again.

Click commands that have both needs_config_file=True and
config_file_initialize_app=True will now be called twice - first time before
setting kallithea.CONFIG but with the config dict as parameter.

That seems kind of intuitive and will simplify the code and allow cleanup of
config handling.

Mute pytype warning:

File "kallithea/bin/kallithea_cli_db.py", line 73, in db_create: No attribute 'global_conf' on Dict[nothing, nothing] [attribute-error]
File "kallithea/bin/kallithea_cli_db.py", line 73, in db_create: No attribute 'local_conf' on Dict[nothing, nothing] [attribute-error]
.. _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.