Fix #49: disable MySQL foreign keys on truncate all (#88)
Fix #49: disable MySQL foreign keys on truncate all (#88)

* Fix #49: disable MySQL foreign keys on truncate all

* Use SET SESSION FOREIGN_KEY_CHECKS to disable / enable fks.
* Fix MySQL truncation list to exclude views.

* Exclude SQLite3 for the add_foreign_key migration

* Remove foreign key, that's a side-issue

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