In a situation when you are doing a major code release and/or database schema change to a production environment is it detrimental to SEO to put up a "Gone Fishin'" page while the upgrade happening?
Assume that using the old code/database schema during the upgrade could put the post-upgrade DB into an undesirable/unknown state.
No, not if you make sure to send the proper HTTP-headers. Do not send 200 OK, as this will make the search engines index your error message.
I would suggest sending "503 Service Unavailable" together with a text explaining why and how long you will be down..
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