if you look at the current mapping the schema has a column for list index which
will not be required once the mapping is changed to bag. Object contract would
not change but the DB schema may change.

I had problems because of unsaved-value attribute of CurrentStep and
HistoryStep. The mapping file had unsaved-value as -1 and when a new current
step was created it had 0 as the value in id field. If this is the case then
hibernate thinks that the entity is already saved and does not issue a insert
sql statement. It works perfectly after removing the unsaved-value attribute.

I have one concern which you have not addressed till now. Are you planning for this store to use its own sessionFactory or it could also
use a session factory supplied by the application ?

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