[server] use a LifoQueue in _CnxSetPool
In postgresql, some cache is attached to the connection. Using a LifoQueue
(last-in, first-out) makes a few connections to get the most load which give
best performance.
Data model
==========
This chapter describes how you define a schema and how to make it evolves as the time goes.
.. toctree::
:maxdepth: 1
definition
metadata
baseschema
define-workflows