- pricing_engine: use shortest period for daily rate comparison instead
of period closest to remaining_days — fixes incorrect free/zero cost
for upgrades when tariffs have different period sets
- pricing_engine: remove unused target_days parameter from
get_tariff_daily_rate_fraction
- admin_users: add duplicate subscription check before create,
change_tariff and activate actions to prevent UniqueViolationError
on uq_subscriptions_user_tariff_active constraint
- admin_users: add IntegrityError fallback on create as TOCTOU safety net
Fringg
da855a7c89