Jira issue originally created by user drauschenbach:

Steps to reproduce:

1. Load an entity from an EntityManager (one with a generator=AUTO primary key)
2. perform $em->remove(entity);
3. Create a new entity to re-create it, using identical attributes (except for PK): $em->persist(new entity);
4. flush()

Expected result:
A DELETE followed by an INSERT

Actual result:
An INSERT with a new assigned primary key, but a failure on some other unique index