for point 1, if we have a list then we can get the steps in the order in which
they were executed. Using a bag with order-by should solve this problem. I think
the retrieving the steps in order might be important for some applications. so
bag or list both should be ok. but using a bag would need changes to the
database schema ?

for 2, yes, having a version number on WorkflowEntry should be great. I am
having some problems using entry as the entry point for everything. These
problems are most likely due to hibernate "write behind". May have to flush the
session manually.

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