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Make the setup warning count cache database-backed
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Currently, the setup warning count is stored on the host, usually in APC. This is used to show the red "setup warnings" banner.

When multiple web nodes are in service in a cluster configuration, this warning can be cached on all of them and need to be cleared individually. This is annoying.

Better would be to make a database cache authoritative, and hit that if we see the flag in APC, then clear the flag from APC if it has already been cleared by another host.