- Add Payment.method field (cash/card/paypal/bank) with migration - Show method in PaymentAdmin list view - Add merge_users management command (atomic, reassigns all FKs) - Add update_crates_2026 command (actual purchased/returned crates) - Add finance_summary_2026 command (Ausgaben, Einnahmen, Kasse, Bilanz) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>