fix: Use ISO year for weekly cohort grouping to fix year boundary bug #86
+40
−14
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Context
Fixed a bug where weekly cohort data was incorrectly bucketed at year boundaries (e.g., week 52 showing only 20 users when the day view showed 275).
The issue: mixing calendar year (
date.year) with ISO week number (date.isocalendar()[1]), resulting in dates like Dec 30 being assigned to the wrong week.Updated all instances to extract both ISO year and ISO week from
isocalendar()for consistency withWeekEventsclass.