[Building Sakai] SURROGATEKEY in MFR_OPEN_FORUM_T

[Zhen Qian]

HI, Sakai Developers:

Both MFR_OPEN_FORUM_T and MFR_MESSAGE_T contain a field called
"surrogatekey". What is that field used for?

When a forum or topic gets deleted, the surrogatekey is set to null. So if
we want to recover the forum, how can we find out the original
surrogatekey?

Thanks,

- Zhen
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