Metadata model
==============

Our metadata is contained in six highly related tables, which are defined using
`SQLAlchemy <http://docs.sqlalchemy.org/en/latest/>`_ classes.

.. contents::
   :local:
   :depth: 2

Relational Diagram
------------------

.. blockdiag::
   :desctable:

   {
      default_fontsize = 16;
      node_width = 240;
      node_height = 60;
      obs_column [ description = ":class:`~.meta.OBSColumn`" ];
      obs_column_table [ description = ":class:`~.meta.OBSColumnTable`" ];
      obs_table [ description = ":class:`~.meta.OBSTable`" ];
      obs_column_to_column [ description = ":class:`~.meta.OBSColumnToColumn`" ];
      obs_column_tag [ description = ":class:`~.meta.OBSColumnTag`" ];
      obs_tag [ description = ":class:`~.meta.OBSTag`" ];
      obs_column -> obs_column_to_column <- obs_column -> obs_column_table <- obs_table;
      obs_column -> obs_column_tag <- obs_tag;
   }

Manually generated entities
---------------------------

.. autoclass:: tasks.meta.OBSColumn
   :members:

.. autoclass:: tasks.meta.OBSTag
   :members:

Autogenerated entities
----------------------

.. autoclass:: tasks.meta.OBSColumnToColumn
   :members:

.. autoclass:: tasks.meta.OBSColumnTable
   :members:

.. autoclass:: tasks.meta.OBSTable
   :members:

.. autoclass:: tasks.meta.OBSColumnTag
   :members: