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I have a plugin where I want to intercept database changes made during the upgrade process.

It looks like the WordPress Way to do this is with the 'dbdelta_queries' filter. The trouble is, my plugin's main .php file isn't loaded during the upgrade process, so I can't hook that filter.

How can I get a plugin to hook a filter -- this filter or any filter -- during the upgrade process?

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Must-use (mu) plugins are loaded during the version update process, unlike ordinary plugins. Explanation here. So it's possible to hook dbdelta_queries and the related filters from within a mu plugin.

(Thanks to Sergey Biryukov for the answer.)

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