activity: when restricting deactivated users, precalculate the user list
the PostgreSQL query planner is easily confused due to the complexity of certain queries we make. while we plan to simplify these queries through unification of activities and objects, we are not yet there. it has been discovered that using a precalculated list of deactivated users encourages the query planner to prefer simpler indices instead of the activity_visibility index. accordingly, drop the subquery and precalc the user list instead.
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