Export statistics to datawarehouse #1243
Description
The goal is to export "invoicing facts" ("fakturagrunnlag") so the master-data is not in the operational DB of notification.
The process should (but must not initially) be automated and "continous (but only export immutable final states!).
The Datawarehouse is documented at https://digdir.atlassian.net/wiki/spaces/BTAP/pages/3366649875/FinOps+Datavarehus+Dokumentasjonsforslag+WIP