Brush

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*2016-07-18*

* Javascript is now bundled and minified using webassets__, meaning that
Node and NPM are no longer required. Note that the use of some
ES2015 code means that the web interface may not work in older
browsers.
* Reduce CPU usage with a real comb by limiting XMLRPC polling
frequency.
* Ensure timestamps are always returned when getting data via the HTTP
interface.
* Improve data downloading interface by using a datetime picker.

__ https://github.com/miracle2k/webassets/

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*2016-06-29*

* Rework web user interface to use Vue__.
* Implement charts with Chart.js__.
* Use time zone aware timestamps on databases that support them. This
breaks backwards compatibility: `timestamp` columns in existing
databases must be manually altered to use (e.g., for Postgres,
``TIMESTAMP WITH TIME ZONE`` instead of ``TIMESTAMP WITHOUT TIME ZONE``).

__ http://vuejs.org/
__ http://www.chartjs.org/

Updating existing tables with Postgres
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

To update the ``timestamp`` column to include time zones if using
Postgres, you can issue the following SQL command:

.. code-block:: psql

ALTER TABLE brush
ALTER COLUMN timestamp TYPE timestamp with time zone
USING timestamp AT TIME ZONE 'UTC';

This update should be performed after stopping Brush. Good practice
dictates that a backup should also be made prior to altering the table.

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*2016-04-11*

* Rework database: use all data from the XMLRPC server and optionally
save data even when the comb is not locked.
* Simplify command-line usage: only data logging and basic web server
for monitoring remain. Other features are still accessible via the
:mod:`brush.comb` module to communicate with a frequency comb in other
ways.

* Added a web interface to view data and monitor status
* Improved command-line usage
* Storage to SQL databases

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