Fix contact creation

[simhnna]

Fix #384

[djaiss]

Thanks a lot for this fix. You've actually put the file in the right order. Funny how mySQL didn't behave like Postgre does in this case.

[simhnna]

I have a suspicion, that in MySQL such enforcements aren't checked which could theoretically result in a database that is not valid in Monica's view.

My observations that led to that are this merge request, which fixes a problem which would be fine if the account_id is allowed to be null. The other thing I observed, is that a migration that drops an index is considered invalid by PostgreSQL (it's a migration that was added in the second half of this year, I'm currently mobile so I can't tell you which one exactly it is...)

Someone that knows more about the internals should write a test or two to confirm or deny this...

[github-actions]

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