* sqlstore: Run tests as integration tests

* Truncate database instead of re-creating it on each test

* Fix test description

See https://github.com/grafana/grafana/pull/12129

* Fix lint issues

* Fix postgres dialect after review suggestion

* Rename and document functions after review suggestion

* Add periods

* Fix auto-increment value for mysql dialect

Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>