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accounted/app/api/import/sie
Jakob Wennberg 8855ef1485 fix: use range overlap for duplicate SIE period check (BFL 4:1) (#163)
* fix: use range overlap for duplicate period check (BFL 4:1 compliance)

The period duplicate check used exact-match on fiscal_year_start/end, missing
overlapping periods (e.g., partial-year file vs full-year import). Now uses
standard interval overlap test (start <= other_end AND end >= other_start).

Updated Swedish error messages to reflect overlap semantics.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: align JSDoc citation to BFL 4:1 for period overlap check

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-02 12:21:42 +02:00
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