This is a web server that takes json data formatted as collectd JSON and puts it into a Postgres database.
Once installed, you'll want to edit your gdata2pg.ini.default file (and rename it) to set it up as you desire. It's a fairly straightforward configuration. Be sure to set your users up in the [users] section of the ini file. This will be used for the basic auth for your server.
You'll also need to install Postgres and get that configured in a basic sense (out of the scope of this README). You'll need to create a database and user for the db connections. The included tsd.sql file can then be used to create the tables in your db.
psql dbname < tsd.sql
Once this is all setup, just run the server.py -c path/to/config and you should be up and running. Now, you can just configure the write_http module in your collectd.conf to point at your server and data should start getting recorded. Optionally, you could also taxman to create plugins and submit custom data.
This is an included script to perform data rollups in Postgres. You can define at what age your data is rolled up and to what aggregate. This is also configured in the gdata2pg.ini file and uses the same Postgres information for the db connection. The best thing to do is set this up to run as cron/systemd.timer.