Deadlock in MYSQL

[kulla]

What is wrong?

Sometimes MySQL deadlocks can occur which would result in internal server errors.

Steps to reproduce

1. Change the tests for delete-bots or delete-regular-users so that user with ID 1 gets deleted.
2. Run yarn test two times
3. At the second run a deadlock error is thrown in creating events (file event-types.ts in the tests).

How should it behave?

In Deadlocks the transaction should be replayed with a delay.

Proposed Solution

I tried to fix the issue in #1542 but it does not work. Maybe one can use the code there.