Newbie question re updates to an indexed DB

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I read a question a few messages down from this one enquiring as to an
'update' feature. While I'm not requiring an update feature as such, I
was wondering what the recommended approach would be to when a DB is
indexed, and then FK relationships change in the DB i.e. what's the
most efficient way to update/reindex the index?

I previously posted a comment about my own domain model which consists
of an Account with 1 or more Profiles which in turn has 0 or more
Devices. Devices can be moved between Profiles. If I have indexed the
Device data flattening it out to include the Profile data, what's the
most efficient way to now update my index? The DB update is as simple
as:

update device set profile_id = ? where id in (?, ?, ...?)

Obviously it won't be that simple in the Lucene index. :frowning:

Thanks,
Darryl