I was wondering if the various bulk migration utilities between
multiple databases correctly do deep copies, maintaining relationships
with new primary keys, etc.

I have a production DB that has been regularly renamed on a yearly
basis to start fresh. I'd like to merge them into one now, retaining
all deep relationships. One approach is to merge them all into the
production DB and use present date fields to distinguish between them,
but another idea, perhaps foolish, is to dumb them into a different
entity type that inherits from a common ancestor, thus separating
archived records from current records.

Any insight on whether the tools of note are up to the task?
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