Revert the conversion to 64-bit ints stored in a PickleType column, because PickleType is incompatible with having a unique constraint.
Revert the conversion to 64-bit ints stored in a PickleType column, because PickleType is incompatible with having a unique constraint.

We moved away from 32 bit ints because of the chance of collision.  It turns out the existing code already checked for collisions and retried, so this wasn't an issue.
n0ano/gantt,n0ano/gantt