Hi list. Some background information on the subject: http://en.wikipedia.org/wiki/Temporal_database I haven't used them before, but I like the idea of never deleting/updating records so you have a complete history (a bit like source code version control). How well do temporal databases work? Do RDBMS (ie Postgresql) need add-ons to make it effective, or can you just add extra temporal columns to all your tables and add them to your app queries? Does this increase app complexity and increase server load a lot? Are there Python libraries which simplify this? (eg: add-ons for Elixir or SQLAlchemy). Or should apps all implement their own 'temporal data access' module, which transparently uses the current date & time until queried for historical data? David.
