[server] Make connection pooler configurable and set better default values
Drop the configuration connections-pool-size and add new configurations options:
* connections-pool-min-size. Set to 0 by default so we open connections only
when needed. This avoid opening min-size*processes connections at startup,
which is, it think, a good default.
* connections-pool-max-size. Set to 0 (unlimited) by default, so we move the
bottleneck to postgresql.
* connections-idle-timeout. Set to 10 minutes. I don't have arguments about
this except that this is the default in pgbouncer.
.. _pre_defined_entity_types:
Pre-defined entities in the library
-----------------------------------
The library defines a set of entity schemas that are required by the system
or commonly used in *CubicWeb* instances.
Entity types used to store the schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* _`CWEType`, entity type
* _`CWRType`, relation type
* _`CWRelation`, relation definition
* _`CWAttribute`, attribute relation definition
* _`CWConstraint`, `CWConstraintType`, `RQLExpression`
Entity types used to manage users and permissions
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* _`CWUser`, system users
* _`CWGroup`, users groups
Entity types used to manage workflows
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* :ref:`Workflow <Workflow>`, workflow entity, linked to some entity types which may use this workflow
* _`State`, workflow state
* _`Transition`, workflow transition
* _`TrInfo`, record of a transition trafic for an entity
Other entity types
~~~~~~~~~~~~~~~~~~
* _`CWProperty`, used to configure the instance
* _`EmailAddress`, email address, used by the system to send notifications
to the users and also used by others optionnals schemas
* _`Bookmark`, an entity type used to allow a user to customize his links within
the instance
* _`ExternalUri`, used for semantic web site to indicate that an entity is the
same as another from an external site