* Drop violating rows before adding foreign constraints
* Don't delete rows with null-references
* Only delete rows when integrityerror is caught
* Move restore of dropped foreign key constraints to a separate migration step
* Use aliases for tables
* Update homeassistant/components/recorder/migration.py
* Update test
* Don't use alias for table we're deleting from, improve test
* Fix MySQL
* Update instead of deleting in case of self references
* Improve log messages
* Batch updates
* Add workaround for unsupported LIMIT in PostgreSQL
* Simplify
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Co-authored-by: J. Nick Koston <nick@koston.org>
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