* abstract boilerplate code into class and rename csv to file
* add db migration
* fix some stuff
* more renaming of csv to file
* rename in translations
* update down revision
* update down revision
* bump chart version
* switch to alter column name approach in db migration
* fix db migration for MySQL
* db migration conflict
* Add UUID to saved_query
* Reuse function from previous migration
* Point to new head
* feat: add backend to export saved queries using new format
* Rename ImportMixin to ImportExportMixin
* Create base class for exports
* Add saved queries as well
* Add constant, small fixes
* Fix wrong import
* Fix lint