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There are tables containing NOT NULL fields for actors
like the log table, which contains who did something.
When we remove a user, we don't want to remove that log
as the entity it is for is still alive. We instead want
to remove the actor (or set it to null) so that the
database stays consistent. The migrations in this patch
recreate every table which has an actor to allow NULL
fields. It also corrects a few constraints to set those
values to NULL on delete.
Resolves: #21
Resolves: #25
Resolves: #28