[FIX] account_operating_unit: use sudo() in OU onchange#835

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IJOL wants to merge 2 commits intoOCA:18.0from

BITVAX:18.0-fix-journal-access-denied

Commits on Apr 5, 2026

[FIX] account_operating_unit: use sudo() to read journal in OU onchange
IJOL
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Commits on Apr 13, 2026

[ADD] account_operating_unit: TDD test for OU onchange AccessError fix
IJOL
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