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* feat(balance): incremental ForwardCalculator — only recalculate from changed date forward When a Sync record carries a window_start_date, ForwardCalculator now seeds its starting balances from the persisted DB balance for window_start_date - 1, then iterates only from window_start_date to calc_end_date. This avoids recomputing every daily balance on a long-lived account when a single transaction changes. Key changes: - Account::Syncer passes sync.window_start_date to Balance::Materializer - Balance::Materializer accepts window_start_date and forwards it to ForwardCalculator; purge_stale_balances uses opening_anchor_date as the lower bound in incremental mode so pre-window balances are not deleted - Balance::ForwardCalculator accepts window_start_date; resolve_starting_balances loads end_cash_balance/end_non_cash_balance from the prior DB record and falls back to full recalculation when no prior record exists - Tests added for incremental correctness, fallback behaviour, and purge safety Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> # Conflicts: # app/models/balance/materializer.rb * Enhance fallback logic on ForwardCalculator and Materializer * fix(balance): address CodeRabbit review issues on incremental ForwardCalculator - materializer.rb: handle empty sorted_balances in incremental mode by still purging stale tail balances beyond window_start_date - 1, preventing orphaned future rows when a transaction is deleted and the recalc window produces no rows - materializer_test.rb: stub incremental? alongside calculate in the incremental sync test so the guard in ForwardCalculator#incremental? doesn't raise when @fell_back is nil (never set because calculate was stubbed out) - materializer_test.rb: correct window_start_date in the fallback test from 3.days.ago to 2.days.ago so window_start_date - 1 hits a date with no persisted balance, correctly triggering full recalculation instead of accidentally seeding from the stale wrong_pre_window balance Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(balance): multi-currency fallback to full recalculation and add corresponding tests * address coderabbit comment about test * Make the foreign-currency precondition explicit in the test setup. --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>