Datamodel add DEFERRABLE INITIALLY DEFERRED

[sjib]

Backporting DEFERRABLE INITIALLY DEFERRED also to qgep:

• To all fk_ relations and
• organisation.fk_dataowner and fk_provider
• to check if to all other organisation relations also needed.

Hopefully solves QGEP/QGEP#852 and similar INTERLIS import relation errors

[sjib]

• Will need adaption in import of plugin see TEKSI code:
  self.session_tww.execute(text("SET CONSTRAINTS ALL DEFERRED;"))
  https://github.com/teksi/wastewater/blob/bccfbdd9d732ea47e172608363799194329cc7ed/plugin/teksi_wastewater/interlis/interlis_model_mapping/interlis_importer_to_intermediate_schema.py#L72

Already in code:

• qgepdss:
  qgep_session.execute("SET CONSTRAINTS ALL DEFERRED;")
  https://github.com/QGEP/qgepqwat2ili/blob/ef399256541b380d5f61863f9b5607a6506d09fc/qgepqwat2ili/qgepdss/import_.py#L62

• qgepsia405: https://github.com/QGEP/qgepqwat2ili/blob/ef399256541b380d5f61863f9b5607a6506d09fc/qgepqwat2ili/qgepsia405/import_.py#L41

• qgep: https://github.com/QGEP/qgepqwat2ili/blob/ef399256541b380d5f61863f9b5607a6506d09fc/qgepqwat2ili/qgep/import_.py#L41

• TEKSI wastewater sets this also on export
  self.abwasser_session.execute(text("SET CONSTRAINTS ALL DEFERRED;"))
  https://github.com/teksi/wastewater/blob/3acfba249866d299f8a22e249d9f1e475fe7b88d/plugin/teksi_wastewater/interlis/interlis_model_mapping/interlis_exporter_to_intermediate_schema.py#L83

[sjib]

• Find out how a delta file should look like to add DEFERRABLE INITIALLY DEFERRED
  see QGEP 1.6.2, Import DSS in datamodel 1.6.1 QGEP#852 (comment)

[ponceta]

Since these are the first deltas for 1.6.2 you have to set current version to 1.6.2 :
https://github.com/QGEP/datamodel/blob/master/system/CURRENT_VERSION.txt

[ponceta]

Thank you for this welcome update!