Bernard Siebens 0223383c9d Fix flaky chart date windows: use calendar months, not 30-day steps ...

_monthly and signup_split approximated "N months ago" as N*30 days, which
drifts against real calendar months by several days a year. Late in some
months that drift undershot a full month, so the "dense 13-point series"
tests flaked depending on which day they ran (confirmed: every 28th+ of
most months). Switched to dateutil.relativedelta for exact calendar-month
arithmetic, which is stable on every day of every month.

2026-07-27 10:37:37 +02:00

69 KiB

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