make_all_scorecards' dedup query used strict bounds, so a single-day
period (supplier created on a month's last day -> start == end under
"Per Month") never matched its own window and was re-created on every
call. The daily refresh_scorecards job would insert a duplicate
submitted period each day for such suppliers, and
test_make_all_scorecards_is_idempotent fails on any date where
nowdate() - 75 days lands on a month end — both nightly server suites
went red on 2026-07-14 (75 days after April 30).
Inclusive bounds cannot false-match adjacent periods: each next period
starts at end_date + 1, so closed intervals never touch.
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