The day-file cleanup (#240) called stats::window_start without the zone that TALLY_TIMEZONE support added to it. With both merged, main no longer compiles with --features aws. The cleanup now passes the site's zone, the same one the day files are grouped by.
Verified: cargo fmt --check, clippy (aws, -D warnings), cargo test (188 with aws, 176 without) and node --check.
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