Portfolio Rebalancer (intern)

Fase 1: last opp workbook, juster mapping/benchmark, beregn aktive bet og eksporter til Excel.

Støtter .xlsx og .xlsm (ikke .xls).
Felter: portfolio, equity_share, norway_share_within_equity, em_share_within_international_equity (+ valgfritt: cash_target, allocation_target, fi_norway_within_fi, fi_long_within_norway_fi, fi_norway_short_within_fi, fi_norway_long_within_fi, fi_global_within_fi)
Felter: portfolio, asset_class, active_bet_adjustment (brukes i mode=reference_plus_active_bets)
Felter: portfolio, asset_class, target_weight (brukes i mode=absolute_targets)